Convenience facilities related to Python functions.
*Latest release 20230331*:
Drop @trace, moved to cs.debug.
## Function `callif(doit, func, *a, **kw)`
Call `func(*a,**kw)` if `doit` is true
otherwise just print it out.
The parameter `func` may be preceeded optionally by a `dict`
containing modes. The current modes are:
* `'print'`: the print function, default the builtin `print`
## Function `callmethod_if(o, method, default=None, a=None, kw=None)`
Call the named `method` on the object `o` if it exists.
If it does not exist, return `default` (which defaults to None).
Otherwise call getattr(o, method)(*a, **kw).
`a` defaults to ().
`kw` defaults to {}.
## Function `derived_from(property_name)`
A property which must be recomputed
if the revision of another property exceeds the snapshot revision.
## Function `derived_property(func, original_revision_name='_revision', lock_name='_lock', property_name=None, unset_object=None)`
A property which must be recomputed
if the reference revision (attached to self)
exceeds the snapshot revision.
## Function `func_a_kw(func, *a, **kw)`
Return a string representing a call to `func(*a,**kw)`.
## Function `func_a_kw_fmt(func, *a, **kw)`
Prepare a percent-format string and associated argument list
describing a call to `func(*a,**kw)`.
Return `format,args`.
The `func` argument can also be a string,
typically a prepared description of `func` such as `funccite(func)`.
*Note*: the returned `args` is a `list` for easy incorporation
into further arguments. The `%` operator requires a `tuple`.
## Function `funccite(func)`
Return a citation for a function (name and code location).
## Function `funcname(func)`
Return a name for the supplied function `func`.
Several objects do not have a __name__ attribute, such as partials.
## Function `prop(func)`
A substitute for the builtin @property.
The builtin @property decorator lets internal AttributeErrors escape.
While that can support properties that appear to exist conditionally,
in practice this is almost never what I want, and it masks deeper errors.
Hence this wrapper for @property that transmutes internal AttributeErrors
into RuntimeErrors.
# Release Log
*Release 20230331*:
Drop @trace, moved to cs.debug.
*Release 20230210*:
Drop the returns_* and yields_* decorators, these days type annotations and @typechecked are the go.
*Release 20221207*:
* @trace: trace exceptions by default, previously false.
* Late import of cs.fs.shortpath to avoid import loop.
* New func_a_kw(func,*a,**kw) returning the formatted form of func_a_kw_fmt(func,*a,**kw).
*Release 20221118*:
@trace: add indenting.
*Release 20220619*:
@trace: rename some parameters, add with_caller.
*Release 20220311.1*:
New callif(doit[,modes],func,*a,**kw) to call or print a function, used in -n/--dry-run stuff sometimes.
*Release 20220311*:
* @trace: new pprint=False option to use pprint.pformat instead of repr for the return value.
* @trace: bugfix use of retval parameter.
*Release 20210913*:
New func_a_kw_fmt(func,*a,**kw) imported from cs.pfx, hooked it into @trace.
*Release 20210906*:
funcname: special case functools.partial, return concise name.
*Release 20210717*:
* Move @trace from debug to py.func, defer log call imports to avoid loops.
* Drop cs.pfx requirement, import opportunisticly with fallback.
*Release 20200518*:
funcname: prefer `func.__qualname__` over `func.__name__`
*Release 20190729*:
funccite: handle callables with no __code__ attribute.
*Release 20190108*:
Break import loop. Use cs.py3.raise_from for portability.
*Release 20181231*:
* Some type specific convenience wrappers for yields_type and returns_type.
* Bugfix for @prop.
*Release 20170906.1*:
Minor tweaks.
*Release 20170906*:
Bugfix for @prop.
*Release 20170608*:
New decorator @prop which works just like the builtin @property, but transmutes internal AttributeError into RuntimeError, unmasking many bugs.
*Release 20160828*:
Use "install_requires" instead of "requires" in DISTINFO.
*Release 20150115*:
First PyPI release.
Raw data
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"description": "Convenience facilities related to Python functions.\n\n*Latest release 20230331*:\nDrop @trace, moved to cs.debug.\n\n## Function `callif(doit, func, *a, **kw)`\n\nCall `func(*a,**kw)` if `doit` is true\notherwise just print it out.\n\nThe parameter `func` may be preceeded optionally by a `dict`\ncontaining modes. The current modes are:\n* `'print'`: the print function, default the builtin `print`\n\n## Function `callmethod_if(o, method, default=None, a=None, kw=None)`\n\nCall the named `method` on the object `o` if it exists.\n\nIf it does not exist, return `default` (which defaults to None).\nOtherwise call getattr(o, method)(*a, **kw).\n`a` defaults to ().\n`kw` defaults to {}.\n\n## Function `derived_from(property_name)`\n\nA property which must be recomputed\nif the revision of another property exceeds the snapshot revision.\n\n## Function `derived_property(func, original_revision_name='_revision', lock_name='_lock', property_name=None, unset_object=None)`\n\nA property which must be recomputed\nif the reference revision (attached to self)\nexceeds the snapshot revision.\n\n## Function `func_a_kw(func, *a, **kw)`\n\nReturn a string representing a call to `func(*a,**kw)`.\n\n## Function `func_a_kw_fmt(func, *a, **kw)`\n\nPrepare a percent-format string and associated argument list\ndescribing a call to `func(*a,**kw)`.\nReturn `format,args`.\n\nThe `func` argument can also be a string,\ntypically a prepared description of `func` such as `funccite(func)`.\n\n*Note*: the returned `args` is a `list` for easy incorporation\ninto further arguments. The `%` operator requires a `tuple`.\n\n## Function `funccite(func)`\n\nReturn a citation for a function (name and code location).\n\n## Function `funcname(func)`\n\nReturn a name for the supplied function `func`.\nSeveral objects do not have a __name__ attribute, such as partials.\n\n## Function `prop(func)`\n\nA substitute for the builtin @property.\n\nThe builtin @property decorator lets internal AttributeErrors escape.\nWhile that can support properties that appear to exist conditionally,\nin practice this is almost never what I want, and it masks deeper errors.\nHence this wrapper for @property that transmutes internal AttributeErrors\ninto RuntimeErrors.\n\n# Release Log\n\n\n\n*Release 20230331*:\nDrop @trace, moved to cs.debug.\n\n*Release 20230210*:\nDrop the returns_* and yields_* decorators, these days type annotations and @typechecked are the go.\n\n*Release 20221207*:\n* @trace: trace exceptions by default, previously false.\n* Late import of cs.fs.shortpath to avoid import loop.\n* New func_a_kw(func,*a,**kw) returning the formatted form of func_a_kw_fmt(func,*a,**kw).\n\n*Release 20221118*:\n@trace: add indenting.\n\n*Release 20220619*:\n@trace: rename some parameters, add with_caller.\n\n*Release 20220311.1*:\nNew callif(doit[,modes],func,*a,**kw) to call or print a function, used in -n/--dry-run stuff sometimes.\n\n*Release 20220311*:\n* @trace: new pprint=False option to use pprint.pformat instead of repr for the return value.\n* @trace: bugfix use of retval parameter.\n\n*Release 20210913*:\nNew func_a_kw_fmt(func,*a,**kw) imported from cs.pfx, hooked it into @trace.\n\n*Release 20210906*:\nfuncname: special case functools.partial, return concise name.\n\n*Release 20210717*:\n* Move @trace from debug to py.func, defer log call imports to avoid loops.\n* Drop cs.pfx requirement, import opportunisticly with fallback.\n\n*Release 20200518*:\nfuncname: prefer `func.__qualname__` over `func.__name__`\n\n*Release 20190729*:\nfunccite: handle callables with no __code__ attribute.\n\n*Release 20190108*:\nBreak import loop. Use cs.py3.raise_from for portability.\n\n*Release 20181231*:\n* Some type specific convenience wrappers for yields_type and returns_type.\n* Bugfix for @prop.\n\n*Release 20170906.1*:\nMinor tweaks.\n\n*Release 20170906*:\nBugfix for @prop.\n\n*Release 20170608*:\nNew decorator @prop which works just like the builtin @property, but transmutes internal AttributeError into RuntimeError, unmasking many bugs.\n\n*Release 20160828*:\nUse \"install_requires\" instead of \"requires\" in DISTINFO.\n\n*Release 20150115*:\nFirst PyPI release.\n",
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