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https://github.com/asottile/reorder-python-imports

Rewrites source to reorder python imports
https://github.com/asottile/reorder-python-imports

linter pre-commit python refactoring

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Rewrites source to reorder python imports

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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/