===============================
skidl
===============================
.. image:: https://img.shields.io/pypi/v/skidl.svg
:target: https://pypi.python.org/pypi/skidl
The SKiDL Python package lets you compactly describe the interconnection of
electronic circuits and components.
The resulting Python program performs electrical rules checking
for common mistakes and outputs a netlist that serves as input to
a PCB layout tool.
* Free software: MIT license
* Documentation: http://devbisme.github.io/skidl
* User Forum: https://github.com/devbisme/skidl/discussions
Features
--------
* Has a powerful, flexible syntax (because it *is* Python).
* Permits compact descriptions of electronic circuits (think about *not* tracing
signals through a multi-page schematic).
* Allows textual descriptions of electronic circuits (think about using
``diff`` and `git <https://en.wikipedia.org/wiki/Git_(software)>`_ for circuits).
* Performs electrical rules checking (ERC) for common mistakes (e.g., unconnected device I/O pins).
* Supports linear / hierarchical / mixed descriptions of electronic designs.
* Fosters design reuse (think about using `PyPi <https://pypi.org/>`_ and `Github <https://github.com/>`_
to distribute electronic designs).
* Makes possible the creation of *smart circuit modules* whose behavior / structure are changed parametrically
(think about filters whose component values are automatically adjusted based on your
desired cutoff frequency).
* Can work with any ECAD tool (only two methods are needed: one for reading the part libraries and another
for outputing the correct netlist format).
* Can perform SPICE simulations (Python 3 only).
* Takes advantage of all the benefits of the Python ecosystem (because it *is* Python).
As a very simple example (see more in the
`blog <https://devbisme.github.io/skidl/category/posts.html>`_),
the SKiDL program below describes a
`two-input AND gate <https://raw.githubusercontent.com/nturley/netlistsvg/master/doc/and.svg?sanitize=true>`_
built from discrete transistors:
.. image:: https://raw.githubusercontent.com/nturley/netlistsvg/master/doc/and.svg?sanitize=true
.. code-block:: python
from skidl import *
# Create part templates.
q = Part("Device", "Q_PNP_CBE", dest=TEMPLATE)
r = Part("Device", "R", dest=TEMPLATE)
# Create nets.
gnd, vcc = Net("GND"), Net("VCC")
a, b, a_and_b = Net("A"), Net("B"), Net("A_AND_B")
# Instantiate parts.
gndt = Part("power", "GND") # Ground terminal.
vcct = Part("power", "VCC") # Power terminal.
q1, q2 = q(2) # Two transistors.
r1, r2, r3, r4, r5 = r(5, value="10K") # Five 10K resistors.
# Make connections between parts.
a & r1 & q1["B C"] & r4 & q2["B C"] & a_and_b & r5 & gnd
b & r2 & q1["B"]
q1["C"] & r3 & gnd
vcc += q1["E"], q2["E"], vcct
gnd += gndt
generate_netlist()
And this is the output that can be fed to a program like KiCad's ``PCBNEW`` to
create the physical PCB::
(export (version D)
(design
(source "/media/devb/Main/devbisme/KiCad/tools/skidl/skidl/circuit.py")
(date "05/11/2021 10:40 AM")
(tool "SKiDL (1.0.0)"))
(components
(comp (ref #PWR1)
(value GND)
(footprint "No Footprint")
(fields
(field (name F0) #PWR)
(field (name F1) GND))
(libsource (lib power) (part GND))
(sheetpath (names /top/16948080335112909674) (tstamps /top/16948080335112909674)))
(comp (ref #PWR2)
(value VCC)
(footprint "No Footprint")
(fields
(field (name F0) #PWR)
(field (name F1) VCC))
(libsource (lib power) (part VCC))
(sheetpath (names /top/10777333099431236833) (tstamps /top/10777333099431236833)))
(comp (ref Q1)
(value Q_PNP_CBE)
(footprint "No Footprint")
(fields
(field (name F0) Q)
(field (name F1) Q_PNP_CBE))
(libsource (lib Device) (part Q_PNP_CBE))
(sheetpath (names /top/5605641708446153824) (tstamps /top/5605641708446153824)))
(comp (ref Q2)
(value Q_PNP_CBE)
(footprint "No Footprint")
(fields
(field (name F0) Q)
(field (name F1) Q_PNP_CBE))
(libsource (lib Device) (part Q_PNP_CBE))
(sheetpath (names /top/3991298653620578089) (tstamps /top/3991298653620578089)))
(comp (ref R1)
(value 10K)
(footprint "No Footprint")
(fields
(field (name F0) R)
(field (name F1) R))
(libsource (lib Device) (part R))
(sheetpath (names /top/17650585640079795295) (tstamps /top/17650585640079795295)))
(comp (ref R2)
(value 10K)
(footprint "No Footprint")
(fields
(field (name F0) R)
(field (name F1) R))
(libsource (lib Device) (part R))
(sheetpath (names /top/11461493733231665754) (tstamps /top/11461493733231665754)))
(comp (ref R3)
(value 10K)
(footprint "No Footprint")
(fields
(field (name F0) R)
(field (name F1) R))
(libsource (lib Device) (part R))
(sheetpath (names /top/1249286041592970488) (tstamps /top/1249286041592970488)))
(comp (ref R4)
(value 10K)
(footprint "No Footprint")
(fields
(field (name F0) R)
(field (name F1) R))
(libsource (lib Device) (part R))
(sheetpath (names /top/7242640812520981502) (tstamps /top/7242640812520981502)))
(comp (ref R5)
(value 10K)
(footprint "No Footprint")
(fields
(field (name F0) R)
(field (name F1) R))
(libsource (lib Device) (part R))
(sheetpath (names /top/9932266607871614386) (tstamps /top/9932266607871614386))))
(nets
(net (code 1) (name A)
(node (ref R1) (pin 1)))
(net (code 2) (name A_AND_B)
(node (ref Q2) (pin 1))
(node (ref R5) (pin 1)))
(net (code 3) (name B)
(node (ref R2) (pin 1)))
(net (code 4) (name GND)
(node (ref #PWR1) (pin 1))
(node (ref R3) (pin 2))
(node (ref R5) (pin 2)))
(net (code 5) (name N$1)
(node (ref Q1) (pin 2))
(node (ref R1) (pin 2))
(node (ref R2) (pin 2)))
(net (code 6) (name N$2)
(node (ref Q1) (pin 1))
(node (ref R3) (pin 1))
(node (ref R4) (pin 1)))
(net (code 7) (name N$3)
(node (ref Q2) (pin 2))
(node (ref R4) (pin 2)))
(net (code 8) (name VCC)
(node (ref #PWR2) (pin 1))
(node (ref Q1) (pin 3))
(node (ref Q2) (pin 3))))
)
History
-------
1.2.1 (2023-07-26)
______________________
- `is_url` function fixed to solve problems with `search` and loading libraries.
1.2.0 (2023-07-14)
______________________
- Added ability to generate an editable schematic from a Circuit object. (Currently only works for KiCad V5.)
- Added Group object for creating hierarchy without using function calls.
- `generate_pcb` now takes an optional list of footprint library directories.
- If not explicitly declared, `Part` objects will load the default footprint from their symbol definition.
- Added `empty_footprint_handler()` for parts without footprints that logs errors by default but can be overriden by the user.
- Symbol libraries can now be searched on remote repositories by placing the URL in the `lib_search_paths` dictionary.
KiCad V6 symbols are found at `https://gitlab.com/kicad/libraries/kicad-symbols/-/raw/master`
and V5 symbols are at `https://raw.githubusercontent.com/KiCad/kicad-symbols/master/`.
- `Part` pins can now be sorted and retrieved in order using the `ordered_pins` property.
1.1.0 (2021-10-22)
______________________
- Added `generate_pcb()` function to create a PCB file directly from
a `Circuit` object. (Currently only works for KiCad.)
- Added `PartTmplt` shortcut which creates a Part template using `dest=TEMPLATE` implicitly.
1.0.0 (2021-05-09)
______________________
- Buses can now be created without names and a name will be
automatically assigned. Or use "name=..." to manually assign a name.
Or just place a string in the list of arguments and that will be used.
- Footprint search can now process directories of footprints without the
need for an `fp-lib-table` file.
- `Part` fields can now be accessed using attributes.
- Creating fields requires use of `Part.fields[key]` instead of Part.key.
- Added context manager for `Circuit` object so Parts/Nets can be joined
using a `with...` statement.
- Adding/removing `Parts` to/from a `Circuit` can now be done using `+=` and `-=`.
- Tags can be added to `Parts` and `Circuits` for hierarchical naming.
- `Part` values can now be assigned arbitrary objects including units from either PySpice or Pint.
- Multi-function pin names can now be split into a collection of shorter aliases,
thus reducing the need to access pins using regexes.
- Schematics can now be automatically using the KiCad symbol graphics for the parts.
- The library interface now handles the Skywater 130 SPICE libraries.
0.0.30 (2020-05-16)
______________________
* Added @package decorator to make subcircuits act like Parts.
* Interfaces now act like dictionaries so the ** operator works as expected.
* Interface I/O can now be accessed using brackets ([]) and via attributes (e.g., intfc.a).
* Interface I/O can now be assigned aliases.
* Added tee() function for creating T-junctions in networks.
* Custom ERCs can now be added using the `erc_assert` function.
* Aliases take precedence over default pin names.
* Substring matching in pin names can be enabled/disabled (off by default).
0.0.29 (2020-01-30)
______________________
* Added XSPICE parts capability to SPICE simulations.
* Unconnected XSPICE ports now are set to NULL in SPICE node lists.
* Added no_files() function to disable output to files of netlists, ERCs, logs, backup libs.
0.0.28 (2019-12-17)
______________________
* The ``zyc`` utility was split into a separate repository and placed on PyPi.
* Fixed slicing of grouped part pins so things like ``ram['A[1]']`` won't grab ``A1``, ``A10``, ``A11``, etc.
0.0.27 (2019-12-16)
______________________
* Prevent changing the name of net 0 when generating a SPICE netlist.
* Fixed Pin, Net, Bus and Part iterators so they'll work in nested loops.
* Part units are automatically added when a part is parsed.
* Files are now opened for reading using latin_1 encoding to allow special symbols used by KiCad.
* Part pins can now be aliased directly, e.g. `uc[5].aliases += 'gp0'`.
* Added class method get() to Part to allow finding a part based on name, reference, description.
* Refactored ERC functions to allow user-extensibility.
* Created a base object for Circuit, Part, Pin, Net, and Bus objects.
* Added an aliases property to the SKiDL base object so all its children could be aliased.
* Updated to perform simulations with ngspice version 30.
* Added a notes property to allow attachment of user notes to Parts, Pins, Nets, etc.
* Added net class to net objects for specifying net-specific design rules in PCBNEW.
* Ignore multiple pins with the same number in symbols with DeMorgan equivalents.
* Fixed problem with non-ASCII chars (e.g. Ohms) in strings.
* Sped-up part/net naming using heap/cache, binary search, sets.
* Sped-up by storing net traversals to avoid recomputation.
* Fixed processing of slices in things like sdram['A[0:15]'].
* Sped-up part_search() by eliminating unnecessary part parsing.
* Improved schematic generation with graphviz.
* Search now allows AND/OR of parenthesized terms.
* New GUI for searching for parts and footprints.
* Footprint libraries to search are now selected from the global fp-lib-table file.
* KiCad library component field values are now stored in a dict in Part indexed by the field name or F0, F1, F2...
* KiCad library component field values are also stored as Part attributes using the field name or F0, F1, F2...
* Added `p` and `n` attributes to `Part` object to permit explicit reference to pin numbers or names.
0.0.26 (2019-01-25)
______________________
* ``search`` command no longer looks in backup library because that leads to erroneous hits in all libraries.
* Part objects will now iterate through their pins and len() will return the number of pins.
* Updated netlist_to_skidl utility to account for new version of kinparse.
0.0.25 (2018-12-30)
______________________
* Updated website.
* KISYSMOD is no longer used to find part libraries, only KICAD_SYMBOL_DIR is used now.
0.0.24 (2018-09-15)
______________________
* Fixed an error where creating a backup part library for a design would create extra pins attached to the nets.
0.0.23 (2018-08-25)
______________________
* Added Network objects to make it easy to create serial & parallel combinations of two-pin parts.
* SKiDL design hierarchy is now embedded in the KiCad netlist that's generated.
0.0.22 (2018-05-XX)
______________________
* Added Interface objects for storing complicated sets of I/O signals for subsystems.
* ERC no longer redundantly checks every segment of a multi-segment net and reports multiple errors.
* copy() function of Part, Bus, Pin, Net objects now returns a scalar object while copy(1) returns a list with one object.
* Bus, Pin, and Net objects now have iterators.
* Corrected initialization of KiCad library search paths.
********************************************************************
0.0.21 (2018-04-30)
______________________
* Added pull() and fetch() methods for getting/creating existing/new Net and Bus objects.
* Added drive property to pins to override their default pin function attribute.
* Part pins and units can now be accessed as attributes.
* Nets, pins, and buses now support the width property.
* Indexing with brackets now works equivalently for pins, nets, and buses.
* Grouped part pins (such as address and data buses) can now be accessed using a slice-like notation, e.g. memory['ADDR[0:7]'].
0.0.20 (2018-03-08)
______________________
* Matching of pin lists now begins with normal string matching before using regexes.
* Added more tests and fixed existing tests.
0.0.19 (2018-02-20)
______________________
* Selecting part pins now looks for exact match before falling back to regex matching.
* PySpice now needs to be manually installed to perform SPICE simulations.
* SPICE simulations of subcircuits (.SUBCKT) now supported.
* Improvements/additions to the library of supported SPICE parts.
0.0.18 (2018-02-07)
______________________
* SPICE simulations of circuits now supported (Python 3 only).
0.0.17 (2018-01-23)
______________________
* Modularized code into separate files.
0.0.16 (2018-01-16)
______________________
* Parsing of KiCad EESchema libraries made more robust.
* DEFAULT_TOOL replaced with set_default_tool() function.
* Some code simplification by using a context manager for opening files.
0.0.15 (2018-01-09)
______________________
* Testing made more robust.
0.0.14 (2018-01-05)
______________________
* KiCad netlists are now parsed using the external package kinparse.
* Cleaned-up pylint-identified issues.
* Removed absolute file paths to libraries from tests.
0.0.13 (2017-08-20)
______________________
* Fixed problem where the search function was only returning parts found in the last library searched.
0.0.12 (2017-04-20)
______________________
* Use of builtin now works with Python 2 & 3.
* Started using namedtuple in some places (like net traversal) for clarity.
* Corrected pin-to-pin connections so if a net is created, it goes into the same Circuit the pins are members of.
* Part templates can now contain a reference to a Circuit object that will be applied when the template is instantiated.
* When pins are connected to nets, or nets to nets, the resulting set of connected nets are all given the same name.
* Buses are not added to a Circuit object if they are already members of it. This fix caused the next problem.
* Buses weren't getting added to the Circuit object because they already contained a reference to the Circuit. Fixed by clearing ref before adding to Circuit.
* Created mini_reset() method to clear circuitry without clearing library cache so the libraries don't have to be loaded again (slow).
* search() utility now prints the names of libraries as they are searched so user sees progress.
* Fixed exceptions if part definition contained non-unicode stuff.
* Hide exceptions that occur when using the show() utility.
* More tests added for NC nets and hand-crafted parts.
* default_circuit and the NC net for the active circuit are now made accessible in all modules using __builtin__.
* Corrected error messages that referenced wrong/non-existing variable.
* Inserted NO_LIB for the library if it doesn't exist when generating KiCad netlists or XML.
* Attributes can now be passed when creating a Circuit object.
* Pins are now associated with part when added to the part.
* Minimum and maximum pins for a part are now computed as needed.
* Each Circuit object now has its own NC net.
* Added tests for bus movement and copying.
* Implemented bus movement between Circuit objects.
* Additional test cases were created.
* Nets and Parts can now be removed from Circuits.
* The circuit that pins and nets are in is now checked before connections are made so cross-circuit connections are not created.
* Default members were added to Pin and Part objects so they would always exist and not cause errors when missing.
* Implemented moving Parts and Nets from one circuit to another (almost).
* Nets with no attached pins are now added to a circuit.
* Re-wrote some tests to account for the presence of no-pin nets in a circuit.
* A class method was missing its 'self' argument.
* Fixed @subcircuit decorator so it won't cause an error if the function it decorates doesn't have a 'circuit' keyword argument.
* Split the unit tests across multiple files. Added setup/teardown code.
* Added capability to create multiple, independent Circuit objects to which Parts and Nets can be assigned. The default circuit is still the target if not Circuit is explicitly referenced.
* Added IOError to exception list for opening a SKiDL part library.
0.0.11 (2017-04-04)
______________________
* Part libraries in SKiDL format are now supported.
* Parts can now be created on-the-fly and instantiated or added to libraries.
* The parts used in a circuit can be stored in a backup SKiDL library and used if the original libraries are missing.
* The KiCad standard part libraries were converted to SKiDL libraries and placed in skidl.libs.
0.0.10 (2017-03-13)
______________________
* Nets without pins can now be merged.
* Parts and Pins are now sorted when netlists are generated.
* For an existing Bus, new bus lines can be inserted at any position or the bus can be extended.
0.0.9 (2017-02-16)
______________________
* Use getattr() instead of __class__.__dict__ so that subclasses of SKiDL objects
can find attributes named within strings without searching the __mor__.
0.0.8 (2017-01-11)
______________________
* skidl_to_netlist now uses templates.
* Default operation of search() is now less exacting.
* Traceback is now suppressed if show() is passed a part name not in a library.
0.0.7 (2016-09-11)
______________________
* Lack of KISYSMOD environment variable no longer causes an exception.
* requirements.txt file now references the requirements from setup.py.
* Changed setup so it generates a pckg_info file with version, author, email.
0.0.6 (2016-09-10)
______________________
* Fixed error caused when trying to find script name when SKiDL is run in interactive mode.
* Silenced errors/warnings when loading KiCad part description (.dcm) files.
0.0.5 (2016-09-07)
______________________
* SKiDL now searches for parts with a user-configurable list of library search paths.
* Part descriptions and keywords are now loaded from the .dcm file associated with a .lib file.
0.0.4 (2016-08-27)
______________________
* SKiDL scripts can now output netlists in XML format.
0.0.3 (2016-08-25)
______________________
* Added command-line utility to convert netlists into SKiDL programs.
0.0.2 (2016-08-17)
______________________
* Changed the link to the documentation.
0.0.1 (2016-08-16)
______________________
* First release on PyPI.
Raw data
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"name": "skidl",
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"requires_python": "",
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"keywords": "skidl kicad electronic circuit schematics",
"author": "Dave Vandenbout",
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"download_url": "https://files.pythonhosted.org/packages/49/14/59846a2634572af9a991b10f69e75cd7336b276079e610aa9ea3fdc2b895/skidl-1.2.1.tar.gz",
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"description": "===============================\nskidl\n===============================\n\n.. image:: https://img.shields.io/pypi/v/skidl.svg\n :target: https://pypi.python.org/pypi/skidl\n\n\nThe SKiDL Python package lets you compactly describe the interconnection of \nelectronic circuits and components.\nThe resulting Python program performs electrical rules checking\nfor common mistakes and outputs a netlist that serves as input to\na PCB layout tool.\n\n* Free software: MIT license\n* Documentation: http://devbisme.github.io/skidl\n* User Forum: https://github.com/devbisme/skidl/discussions\n\nFeatures\n--------\n\n* Has a powerful, flexible syntax (because it *is* Python).\n* Permits compact descriptions of electronic circuits (think about *not* tracing\n signals through a multi-page schematic).\n* Allows textual descriptions of electronic circuits (think about using \n ``diff`` and `git <https://en.wikipedia.org/wiki/Git_(software)>`_ for circuits).\n* Performs electrical rules checking (ERC) for common mistakes (e.g., unconnected device I/O pins).\n* Supports linear / hierarchical / mixed descriptions of electronic designs.\n* Fosters design reuse (think about using `PyPi <https://pypi.org/>`_ and `Github <https://github.com/>`_\n to distribute electronic designs).\n* Makes possible the creation of *smart circuit modules* whose behavior / structure are changed parametrically\n (think about filters whose component values are automatically adjusted based on your\n desired cutoff frequency).\n* Can work with any ECAD tool (only two methods are needed: one for reading the part libraries and another\n for outputing the correct netlist format).\n* Can perform SPICE simulations (Python 3 only).\n* Takes advantage of all the benefits of the Python ecosystem (because it *is* Python).\n\nAs a very simple example (see more in the \n`blog <https://devbisme.github.io/skidl/category/posts.html>`_),\nthe SKiDL program below describes a \n`two-input AND gate <https://raw.githubusercontent.com/nturley/netlistsvg/master/doc/and.svg?sanitize=true>`_\nbuilt from discrete transistors:\n\n.. image:: https://raw.githubusercontent.com/nturley/netlistsvg/master/doc/and.svg?sanitize=true\n\n.. code-block:: python\n\n from skidl import *\n\n # Create part templates.\n q = Part(\"Device\", \"Q_PNP_CBE\", dest=TEMPLATE)\n r = Part(\"Device\", \"R\", dest=TEMPLATE)\n\n # Create nets.\n gnd, vcc = Net(\"GND\"), Net(\"VCC\")\n a, b, a_and_b = Net(\"A\"), Net(\"B\"), Net(\"A_AND_B\")\n\n # Instantiate parts.\n gndt = Part(\"power\", \"GND\") # Ground terminal.\n vcct = Part(\"power\", \"VCC\") # Power terminal.\n q1, q2 = q(2) # Two transistors.\n r1, r2, r3, r4, r5 = r(5, value=\"10K\") # Five 10K resistors.\n\n # Make connections between parts.\n a & r1 & q1[\"B C\"] & r4 & q2[\"B C\"] & a_and_b & r5 & gnd\n b & r2 & q1[\"B\"]\n q1[\"C\"] & r3 & gnd\n vcc += q1[\"E\"], q2[\"E\"], vcct\n gnd += gndt\n\n generate_netlist()\n\nAnd this is the output that can be fed to a program like KiCad's ``PCBNEW`` to\ncreate the physical PCB::\n\n (export (version D)\n (design\n (source \"/media/devb/Main/devbisme/KiCad/tools/skidl/skidl/circuit.py\")\n (date \"05/11/2021 10:40 AM\")\n (tool \"SKiDL (1.0.0)\"))\n (components\n (comp (ref #PWR1)\n (value GND)\n (footprint \"No Footprint\")\n (fields\n (field (name F0) #PWR)\n (field (name F1) GND))\n (libsource (lib power) (part GND))\n (sheetpath (names /top/16948080335112909674) (tstamps /top/16948080335112909674)))\n (comp (ref #PWR2)\n (value VCC)\n (footprint \"No Footprint\")\n (fields\n (field (name F0) #PWR)\n (field (name F1) VCC))\n (libsource (lib power) (part VCC))\n (sheetpath (names /top/10777333099431236833) (tstamps /top/10777333099431236833)))\n (comp (ref Q1)\n (value Q_PNP_CBE)\n (footprint \"No Footprint\")\n (fields\n (field (name F0) Q)\n (field (name F1) Q_PNP_CBE))\n (libsource (lib Device) (part Q_PNP_CBE))\n (sheetpath (names /top/5605641708446153824) (tstamps /top/5605641708446153824)))\n (comp (ref Q2)\n (value Q_PNP_CBE)\n (footprint \"No Footprint\")\n (fields\n (field (name F0) Q)\n (field (name F1) Q_PNP_CBE))\n (libsource (lib Device) (part Q_PNP_CBE))\n (sheetpath (names /top/3991298653620578089) (tstamps /top/3991298653620578089)))\n (comp (ref R1)\n (value 10K)\n (footprint \"No Footprint\")\n (fields\n (field (name F0) R)\n (field (name F1) R))\n (libsource (lib Device) (part R))\n (sheetpath (names /top/17650585640079795295) (tstamps /top/17650585640079795295)))\n (comp (ref R2)\n (value 10K)\n (footprint \"No Footprint\")\n (fields\n (field (name F0) R)\n (field (name F1) R))\n (libsource (lib Device) (part R))\n (sheetpath (names /top/11461493733231665754) (tstamps /top/11461493733231665754)))\n (comp (ref R3)\n (value 10K)\n (footprint \"No Footprint\")\n (fields\n (field (name F0) R)\n (field (name F1) R))\n (libsource (lib Device) (part R))\n (sheetpath (names /top/1249286041592970488) (tstamps /top/1249286041592970488)))\n (comp (ref R4)\n (value 10K)\n (footprint \"No Footprint\")\n (fields\n (field (name F0) R)\n (field (name F1) R))\n (libsource (lib Device) (part R))\n (sheetpath (names /top/7242640812520981502) (tstamps /top/7242640812520981502)))\n (comp (ref R5)\n (value 10K)\n (footprint \"No Footprint\")\n (fields\n (field (name F0) R)\n (field (name F1) R))\n (libsource (lib Device) (part R))\n (sheetpath (names /top/9932266607871614386) (tstamps /top/9932266607871614386))))\n (nets\n (net (code 1) (name A)\n (node (ref R1) (pin 1)))\n (net (code 2) (name A_AND_B)\n (node (ref Q2) (pin 1))\n (node (ref R5) (pin 1)))\n (net (code 3) (name B)\n (node (ref R2) (pin 1)))\n (net (code 4) (name GND)\n (node (ref #PWR1) (pin 1))\n (node (ref R3) (pin 2))\n (node (ref R5) (pin 2)))\n (net (code 5) (name N$1)\n (node (ref Q1) (pin 2))\n (node (ref R1) (pin 2))\n (node (ref R2) (pin 2)))\n (net (code 6) (name N$2)\n (node (ref Q1) (pin 1))\n (node (ref R3) (pin 1))\n (node (ref R4) (pin 1)))\n (net (code 7) (name N$3)\n (node (ref Q2) (pin 2))\n (node (ref R4) (pin 2)))\n (net (code 8) (name VCC)\n (node (ref #PWR2) (pin 1))\n (node (ref Q1) (pin 3))\n (node (ref Q2) (pin 3))))\n )\n\n\n\nHistory\n-------\n\n\n1.2.1 (2023-07-26)\n______________________\n- `is_url` function fixed to solve problems with `search` and loading libraries.\n\n\n1.2.0 (2023-07-14)\n______________________\n\n- Added ability to generate an editable schematic from a Circuit object. (Currently only works for KiCad V5.)\n- Added Group object for creating hierarchy without using function calls.\n- `generate_pcb` now takes an optional list of footprint library directories.\n- If not explicitly declared, `Part` objects will load the default footprint from their symbol definition.\n- Added `empty_footprint_handler()` for parts without footprints that logs errors by default but can be overriden by the user.\n- Symbol libraries can now be searched on remote repositories by placing the URL in the `lib_search_paths` dictionary.\n KiCad V6 symbols are found at `https://gitlab.com/kicad/libraries/kicad-symbols/-/raw/master`\n and V5 symbols are at `https://raw.githubusercontent.com/KiCad/kicad-symbols/master/`.\n- `Part` pins can now be sorted and retrieved in order using the `ordered_pins` property.\n\n\n1.1.0 (2021-10-22)\n______________________\n\n- Added `generate_pcb()` function to create a PCB file directly from\n a `Circuit` object. (Currently only works for KiCad.)\n- Added `PartTmplt` shortcut which creates a Part template using `dest=TEMPLATE` implicitly.\n\n1.0.0 (2021-05-09)\n______________________\n\n- Buses can now be created without names and a name will be\n automatically assigned. Or use \"name=...\" to manually assign a name.\n Or just place a string in the list of arguments and that will be used.\n- Footprint search can now process directories of footprints without the\n need for an `fp-lib-table` file.\n- `Part` fields can now be accessed using attributes.\n- Creating fields requires use of `Part.fields[key]` instead of Part.key.\n- Added context manager for `Circuit` object so Parts/Nets can be joined\n using a `with...` statement.\n- Adding/removing `Parts` to/from a `Circuit` can now be done using `+=` and `-=`.\n- Tags can be added to `Parts` and `Circuits` for hierarchical naming.\n- `Part` values can now be assigned arbitrary objects including units from either PySpice or Pint.\n- Multi-function pin names can now be split into a collection of shorter aliases,\n thus reducing the need to access pins using regexes.\n- Schematics can now be automatically using the KiCad symbol graphics for the parts.\n- The library interface now handles the Skywater 130 SPICE libraries.\n\n\n0.0.30 (2020-05-16)\n______________________\n\n* Added @package decorator to make subcircuits act like Parts.\n* Interfaces now act like dictionaries so the ** operator works as expected.\n* Interface I/O can now be accessed using brackets ([]) and via attributes (e.g., intfc.a).\n* Interface I/O can now be assigned aliases.\n* Added tee() function for creating T-junctions in networks.\n* Custom ERCs can now be added using the `erc_assert` function.\n* Aliases take precedence over default pin names.\n* Substring matching in pin names can be enabled/disabled (off by default).\n\n\n0.0.29 (2020-01-30)\n______________________\n\n* Added XSPICE parts capability to SPICE simulations.\n* Unconnected XSPICE ports now are set to NULL in SPICE node lists.\n* Added no_files() function to disable output to files of netlists, ERCs, logs, backup libs.\n\n\n0.0.28 (2019-12-17)\n______________________\n\n* The ``zyc`` utility was split into a separate repository and placed on PyPi.\n* Fixed slicing of grouped part pins so things like ``ram['A[1]']`` won't grab ``A1``, ``A10``, ``A11``, etc. \n\n\n0.0.27 (2019-12-16)\n______________________\n\n* Prevent changing the name of net 0 when generating a SPICE netlist.\n* Fixed Pin, Net, Bus and Part iterators so they'll work in nested loops.\n* Part units are automatically added when a part is parsed.\n* Files are now opened for reading using latin_1 encoding to allow special symbols used by KiCad.\n* Part pins can now be aliased directly, e.g. `uc[5].aliases += 'gp0'`.\n* Added class method get() to Part to allow finding a part based on name, reference, description.\n* Refactored ERC functions to allow user-extensibility.\n* Created a base object for Circuit, Part, Pin, Net, and Bus objects.\n* Added an aliases property to the SKiDL base object so all its children could be aliased.\n* Updated to perform simulations with ngspice version 30.\n* Added a notes property to allow attachment of user notes to Parts, Pins, Nets, etc.\n* Added net class to net objects for specifying net-specific design rules in PCBNEW.\n* Ignore multiple pins with the same number in symbols with DeMorgan equivalents.\n* Fixed problem with non-ASCII chars (e.g. Ohms) in strings.\n* Sped-up part/net naming using heap/cache, binary search, sets.\n* Sped-up by storing net traversals to avoid recomputation.\n* Fixed processing of slices in things like sdram['A[0:15]'].\n* Sped-up part_search() by eliminating unnecessary part parsing.\n* Improved schematic generation with graphviz.\n* Search now allows AND/OR of parenthesized terms.\n* New GUI for searching for parts and footprints.\n* Footprint libraries to search are now selected from the global fp-lib-table file.\n* KiCad library component field values are now stored in a dict in Part indexed by the field name or F0, F1, F2... \n* KiCad library component field values are also stored as Part attributes using the field name or F0, F1, F2...\n* Added `p` and `n` attributes to `Part` object to permit explicit reference to pin numbers or names.\n\n\n0.0.26 (2019-01-25)\n______________________\n\n* ``search`` command no longer looks in backup library because that leads to erroneous hits in all libraries.\n* Part objects will now iterate through their pins and len() will return the number of pins.\n* Updated netlist_to_skidl utility to account for new version of kinparse.\n\n\n0.0.25 (2018-12-30)\n______________________\n\n* Updated website.\n* KISYSMOD is no longer used to find part libraries, only KICAD_SYMBOL_DIR is used now.\n\n\n0.0.24 (2018-09-15)\n______________________\n\n* Fixed an error where creating a backup part library for a design would create extra pins attached to the nets.\n\n\n0.0.23 (2018-08-25)\n______________________\n\n* Added Network objects to make it easy to create serial & parallel combinations of two-pin parts.\n* SKiDL design hierarchy is now embedded in the KiCad netlist that's generated.\n\n\n0.0.22 (2018-05-XX)\n______________________\n\n* Added Interface objects for storing complicated sets of I/O signals for subsystems.\n* ERC no longer redundantly checks every segment of a multi-segment net and reports multiple errors.\n* copy() function of Part, Bus, Pin, Net objects now returns a scalar object while copy(1) returns a list with one object.\n* Bus, Pin, and Net objects now have iterators.\n* Corrected initialization of KiCad library search paths.\n\n********************************************************************\n\n0.0.21 (2018-04-30)\n______________________\n\n* Added pull() and fetch() methods for getting/creating existing/new Net and Bus objects.\n* Added drive property to pins to override their default pin function attribute.\n* Part pins and units can now be accessed as attributes.\n* Nets, pins, and buses now support the width property.\n* Indexing with brackets now works equivalently for pins, nets, and buses.\n* Grouped part pins (such as address and data buses) can now be accessed using a slice-like notation, e.g. memory['ADDR[0:7]'].\n\n\n0.0.20 (2018-03-08)\n______________________\n\n* Matching of pin lists now begins with normal string matching before using regexes.\n* Added more tests and fixed existing tests.\n\n\n0.0.19 (2018-02-20)\n______________________\n\n* Selecting part pins now looks for exact match before falling back to regex matching.\n* PySpice now needs to be manually installed to perform SPICE simulations.\n* SPICE simulations of subcircuits (.SUBCKT) now supported.\n* Improvements/additions to the library of supported SPICE parts.\n\n\n0.0.18 (2018-02-07)\n______________________\n\n* SPICE simulations of circuits now supported (Python 3 only).\n\n\n0.0.17 (2018-01-23)\n______________________\n\n* Modularized code into separate files.\n\n\n0.0.16 (2018-01-16)\n______________________\n\n* Parsing of KiCad EESchema libraries made more robust.\n* DEFAULT_TOOL replaced with set_default_tool() function.\n* Some code simplification by using a context manager for opening files.\n\n\n0.0.15 (2018-01-09)\n______________________\n\n* Testing made more robust.\n\n\n0.0.14 (2018-01-05)\n______________________\n\n* KiCad netlists are now parsed using the external package kinparse.\n* Cleaned-up pylint-identified issues.\n* Removed absolute file paths to libraries from tests.\n\n\n0.0.13 (2017-08-20)\n______________________\n\n* Fixed problem where the search function was only returning parts found in the last library searched.\n\n\n0.0.12 (2017-04-20)\n______________________\n\n* Use of builtin now works with Python 2 & 3.\n* Started using namedtuple in some places (like net traversal) for clarity.\n* Corrected pin-to-pin connections so if a net is created, it goes into the same Circuit the pins are members of.\n* Part templates can now contain a reference to a Circuit object that will be applied when the template is instantiated.\n* When pins are connected to nets, or nets to nets, the resulting set of connected nets are all given the same name.\n* Buses are not added to a Circuit object if they are already members of it. This fix caused the next problem.\n* Buses weren't getting added to the Circuit object because they already contained a reference to the Circuit. Fixed by clearing ref before adding to Circuit.\n* Created mini_reset() method to clear circuitry without clearing library cache so the libraries don't have to be loaded again (slow).\n* search() utility now prints the names of libraries as they are searched so user sees progress.\n* Fixed exceptions if part definition contained non-unicode stuff.\n* Hide exceptions that occur when using the show() utility.\n* More tests added for NC nets and hand-crafted parts.\n* default_circuit and the NC net for the active circuit are now made accessible in all modules using __builtin__.\n* Corrected error messages that referenced wrong/non-existing variable.\n* Inserted NO_LIB for the library if it doesn't exist when generating KiCad netlists or XML.\n* Attributes can now be passed when creating a Circuit object.\n* Pins are now associated with part when added to the part.\n* Minimum and maximum pins for a part are now computed as needed.\n* Each Circuit object now has its own NC net.\n* Added tests for bus movement and copying.\n* Implemented bus movement between Circuit objects.\n* Additional test cases were created.\n* Nets and Parts can now be removed from Circuits.\n* The circuit that pins and nets are in is now checked before connections are made so cross-circuit connections are not created.\n* Default members were added to Pin and Part objects so they would always exist and not cause errors when missing.\n* Implemented moving Parts and Nets from one circuit to another (almost).\n* Nets with no attached pins are now added to a circuit.\n* Re-wrote some tests to account for the presence of no-pin nets in a circuit.\n* A class method was missing its 'self' argument.\n* Fixed @subcircuit decorator so it won't cause an error if the function it decorates doesn't have a 'circuit' keyword argument.\n* Split the unit tests across multiple files. Added setup/teardown code.\n* Added capability to create multiple, independent Circuit objects to which Parts and Nets can be assigned. The default circuit is still the target if not Circuit is explicitly referenced.\n* Added IOError to exception list for opening a SKiDL part library.\n\n\n0.0.11 (2017-04-04)\n______________________\n\n* Part libraries in SKiDL format are now supported.\n* Parts can now be created on-the-fly and instantiated or added to libraries.\n* The parts used in a circuit can be stored in a backup SKiDL library and used if the original libraries are missing.\n* The KiCad standard part libraries were converted to SKiDL libraries and placed in skidl.libs.\n\n\n0.0.10 (2017-03-13)\n______________________\n\n* Nets without pins can now be merged.\n* Parts and Pins are now sorted when netlists are generated.\n* For an existing Bus, new bus lines can be inserted at any position or the bus can be extended.\n\n\n0.0.9 (2017-02-16)\n______________________\n\n* Use getattr() instead of __class__.__dict__ so that subclasses of SKiDL objects\n can find attributes named within strings without searching the __mor__.\n\n\n0.0.8 (2017-01-11)\n______________________\n\n* skidl_to_netlist now uses templates.\n* Default operation of search() is now less exacting.\n* Traceback is now suppressed if show() is passed a part name not in a library.\n\n\n0.0.7 (2016-09-11)\n______________________\n\n* Lack of KISYSMOD environment variable no longer causes an exception.\n* requirements.txt file now references the requirements from setup.py.\n* Changed setup so it generates a pckg_info file with version, author, email.\n\n\n0.0.6 (2016-09-10)\n______________________\n\n* Fixed error caused when trying to find script name when SKiDL is run in interactive mode.\n* Silenced errors/warnings when loading KiCad part description (.dcm) files.\n\n\n0.0.5 (2016-09-07)\n______________________\n\n* SKiDL now searches for parts with a user-configurable list of library search paths.\n* Part descriptions and keywords are now loaded from the .dcm file associated with a .lib file.\n\n\n0.0.4 (2016-08-27)\n______________________\n\n* SKiDL scripts can now output netlists in XML format.\n\n\n0.0.3 (2016-08-25)\n______________________\n\n* Added command-line utility to convert netlists into SKiDL programs.\n\n\n0.0.2 (2016-08-17)\n______________________\n\n* Changed the link to the documentation.\n\n\n0.0.1 (2016-08-16)\n______________________\n\n* First release on PyPI.\n",
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