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reorder-python-imports
======================
Tool for automatically reordering python imports. Similar to `isort` but
uses static analysis more.
## Installation
```bash
pip install reorder-python-imports
```
## Console scripts
Consult `reorder-python-imports --help` for the full set of options.
`reorder-python-imports` takes filenames as positional arguments
Common options:
- `--py##-plus`: [see below](#removing-obsolete-__future__-imports).
- `--add-import` / `--remove-import`: [see below](#adding--removing-imports).
- `--replace-import`: [see below](#replacing-imports).
- `--application-directories`: by default, `reorder-python-imports` assumes
your project is rooted at `.`. If this isn't true, tell it where your
import roots live. For example, when using the popular `./src` layout you'd
use `--application-directories=.:src` (note: multiple paths are separated
using a `:`).
- `--unclassifiable-application-module`: (may be specified multiple times)
modules names that are considered application modules. this setting is
intended to be used for things like C modules which may not always appear on
the filesystem.
## As a pre-commit hook
See [pre-commit](https://github.com/pre-commit/pre-commit) for instructions
Sample `.pre-commit-config.yaml`
```yaml
- repo: https://github.com/asottile/reorder-python-imports
rev: v3.14.0
hooks:
- id: reorder-python-imports
```
## What does it do?
### Separates imports into three sections
```python
import sys
import pyramid
import reorder_python_imports
```
becomes (stdlib, third party, first party)
```python
import sys
import pyramid
import reorder_python_imports
```
### `import` imports before `from` imports
```python
from os import path
import sys
```
becomes
```python
import sys
from os import path
```
### Splits `from` imports
```python
from os.path import abspath, exists
```
becomes
```python
from os.path import abspath
from os.path import exists
```
### Removes duplicate imports
```python
import os
import os.path
import sys
import sys
```
becomes
```python
import os.path
import sys
```
## Using `# noreorder`
Lines containing and after lines which contain a `# noreorder` comment will
be ignored. Additionally any imports that appear after non-whitespace
non-comment lines will be ignored.
For instance, these will not be changed:
```python
import sys
try: # not import, not whitespace
import foo
except ImportError:
pass
```
```python
import sys
import reorder_python_imports
import matplotlib # noreorder
matplotlib.use('Agg')
import matplotlib.pyplot as plt
```
```python
# noreorder
import sys
import pyramid
import reorder_python_imports
```
## why this style?
The style chosen by `reorder-python-imports` has a single aim: reduce merge
conflicts.
By having a single import per line, multiple contributors can
add / remove imports from a single module without resulting in a conflict.
Consider the following example which causes a merge conflict:
```diff
# developer 1
-from typing import Dict, List
+from typing import Any, Dict, List
```
```diff
# developer 2
-from typing import Dict, List
+from typing import Dict, List, Tuple
```
no conflict with the style enforced by `reorder-python-imports`:
```diff
+from typing import Any
from typing import Dict
from typing import List
+from typing import Tuple
```
## Adding / Removing Imports
Let's say I want to enforce `absolute_import` across my codebase. I can use:
`--add-import 'from __future__ import absolute_import'`.
```console
$ cat test.py
print('Hello world')
$ reorder-python-imports --add-import 'from __future__ import absolute_import' test.py
Reordering imports in test.py
$ cat test.py
from __future__ import absolute_import
print('Hello world')
```
Let's say I no longer care about supporting Python 2.5, I can remove
`from __future__ import with_statement` with
`--remove-import 'from __future__ import with_statement'`
```console
$ cat test.py
from __future__ import with_statement
with open('foo.txt', 'w') as foo_f:
foo_f.write('hello world')
$ reorder-python-imports --remove-import 'from __future__ import with_statement' test.py
Reordering imports in test.py
$ cat test.py
with open('foo.txt', 'w') as foo_f:
foo_f.write('hello world')
```
## Replacing imports
Imports can be replaced with others automatically (if they provide the same
names). This can be useful for factoring out compatibility libraries such
as `six` (see below for automated `six` rewriting).
This rewrite avoids `NameError`s as such it only occurs when:
- the imported symbol is the same before and after
- the import is a `from` import
The argument is specified as `orig.mod=new.mod` or with an optional
checked attribute `orig.mod=new.mod:attr`. The checked attribute is useful
for renaming some imports from a module instead of a full module.
For example:
```bash
# full module move
--replace-import six.moves.queue=queue
# specific attribute move
--replace-import six.moves=io:StringIO
```
## Removing obsolete `__future__` imports
The cli provides a few options to help "burn the bridges" with old python
versions by removing `__future__` imports automatically. Each option implies
all older versions.
- `--py22-plus`: `nested_scopes`
- `--py23-plus`: `generators`
- `--py26-plus`: `with_statement`
- `--py3-plus`: `division`, `absolute_import`, `print_function`,
`unicode_literals`
- `--py37-plus`: `generator_stop`
## Removing / rewriting obsolete `six` imports
With `--py3-plus`, `reorder-python-imports` will also remove / rewrite imports
from `six`. Rewrites follow the same rules as
[replacing imports](#replacing-imports) above.
For example:
```diff
+import queue
+from io import StringIO
+from urllib.parse import quote_plus
+
import six.moves.urllib.parse
-from six.moves import queue
-from six.moves import range
-from six.moves import StringIO
-from six.moves.urllib.parse import quote_plus
```
## Rewriting mock imports
With `--py3-plus`, `reorder-python-imports` will also rewrite various `mock` imports:
```diff
-from mock import patch
+from unittest.mock import patch
```
## Rewriting `mypy_extensions` and `typing_extension` imports
With `--py36-plus` and higher, `reorder-python-imports` will also rewrite
`mypy_extensions` and `typing_extensions` imports ported to `typing`.
```diff
-from mypy_extensions import TypedDict
+from typing import TypedDict
```
## Rewriting pep 585 typing imports
With `--py39-plus` and higher, `reorder-python-imports` will replace imports
which were moved out of the typing module in [pep 585].
```diff
-from typing import Sequence
+from collections.abc import Sequence
```
[pep 585]: https://www.python.org/dev/peps/pep-0585/
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For example, when using the popular `./src` layout you'd\n use `--application-directories=.:src` (note: multiple paths are separated\n using a `:`).\n- `--unclassifiable-application-module`: (may be specified multiple times)\n modules names that are considered application modules. this setting is\n intended to be used for things like C modules which may not always appear on\n the filesystem.\n\n## As a pre-commit hook\n\nSee [pre-commit](https://github.com/pre-commit/pre-commit) for instructions\n\nSample `.pre-commit-config.yaml`\n\n```yaml\n- repo: https://github.com/asottile/reorder-python-imports\n rev: v3.14.0\n hooks:\n - id: reorder-python-imports\n```\n\n## What does it do?\n\n### Separates imports into three sections\n\n```python\nimport sys\nimport pyramid\nimport reorder_python_imports\n```\n\nbecomes (stdlib, third party, first party)\n\n```python\nimport sys\n\nimport pyramid\n\nimport reorder_python_imports\n```\n\n### `import` imports before `from` imports\n\n```python\nfrom os import path\nimport sys\n```\n\nbecomes\n\n```python\nimport sys\nfrom os import path\n```\n\n### Splits `from` imports\n\n```python\nfrom os.path import abspath, exists\n```\n\nbecomes\n\n```python\nfrom os.path import abspath\nfrom os.path import exists\n```\n\n### Removes duplicate imports\n\n```python\nimport os\nimport os.path\nimport sys\nimport sys\n```\n\nbecomes\n\n```python\nimport os.path\nimport sys\n```\n\n## Using `# noreorder`\n\nLines containing and after lines which contain a `# noreorder` comment will\nbe ignored. 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I can use:\n`--add-import 'from __future__ import absolute_import'`.\n\n```console\n$ cat test.py\nprint('Hello world')\n$ reorder-python-imports --add-import 'from __future__ import absolute_import' test.py\nReordering imports in test.py\n$ cat test.py\nfrom __future__ import absolute_import\nprint('Hello world')\n```\n\nLet's say I no longer care about supporting Python 2.5, I can remove\n`from __future__ import with_statement` with\n`--remove-import 'from __future__ import with_statement'`\n\n```console\n$ cat test.py\nfrom __future__ import with_statement\nwith open('foo.txt', 'w') as foo_f:\n foo_f.write('hello world')\n$ reorder-python-imports --remove-import 'from __future__ import with_statement' test.py\nReordering imports in test.py\n$ cat test.py\nwith open('foo.txt', 'w') as foo_f:\n foo_f.write('hello world')\n```\n\n## Replacing imports\n\nImports can be replaced with others automatically (if they provide the same\nnames). This can be useful for factoring out compatibility libraries such\nas `six` (see below for automated `six` rewriting).\n\nThis rewrite avoids `NameError`s as such it only occurs when:\n\n- the imported symbol is the same before and after\n- the import is a `from` import\n\nThe argument is specified as `orig.mod=new.mod` or with an optional\nchecked attribute `orig.mod=new.mod:attr`. The checked attribute is useful\nfor renaming some imports from a module instead of a full module.\n\nFor example:\n\n```bash\n# full module move\n--replace-import six.moves.queue=queue\n# specific attribute move\n--replace-import six.moves=io:StringIO\n```\n\n## Removing obsolete `__future__` imports\n\nThe cli provides a few options to help \"burn the bridges\" with old python\nversions by removing `__future__` imports automatically. 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