A tool to automatically replace 'import *' imports with explicit imports in files
Tool to automatically replace
import * imports with explicit imports
- Assumes only names in the current file are used by star imports (e.g., it
won't work to replace star imports in
For files within the same module, removestar determines missing imported names
statically. For external library imports, including imports of standard
library modules, it dynamically imports the module to determine the names.
This can be disabled with the
See the issue tracker. Pull requests are welcome.
pip install removestar
or if you use conda
conda install -c conda-forge removestar
$ removestar file.py # Shows diff but does not edit file.py $ removestar -i file.py # Edits file.py in-place $ removestar -i module/ # Modifies every Python file in module/ recursively
import * so bad?
from module import * is generally frowned upon in Python. It is
considered acceptable when working interactively at a
python prompt, or in
__init__.py files (removestar skips
__init__.py files by default).
Some reasons why
import * is bad:
- It hides which names are actually imported.
- It is difficult both for human readers and static analyzers such as
pyflakes to tell where a given name comes from when
import *is used. For example, pyflakes cannot detect unused names (for instance, from typos) in the presence of
- If there are multiple
import *statements, it may not be clear which names come from which module. In some cases, both modules may have a given name, but only the second import will end up being used. This can break people's intuition that the order of imports in a Python file generally does not matter.
import *often imports more names than you would expect. Unless the module you import defines
dels unused names at the module level,
import *will import every public (doesn't start with an underscore) name defined in the module file. This can often include things like standard library imports or loop variables defined at the top-level of the file. For imports from modules (from
from module import *will include every submodule defined in that module. Using
__all__in modules and
__init__.pyfiles is also good practice, as these things are also often confusing even for interactive use where
import *is acceptable.
- In Python 3,
import *is syntactically not allowed inside of a function.
Here are some official Python references stating not to use
import * in
In general, don’t use
from modulename import *. Doing so clutters the importer’s namespace, and makes it much harder for linters to detect undefined names.
PEP 8 (the official Python style guide):
Wildcard imports (
from <module> import *) should be avoided, as they make it unclear which names are present in the namespace, confusing both readers and many automated tools.
Unfortunately, if you come across a file in the wild that uses
import *, it
can be hard to fix it, because you need to find every name in the file that is
imported from the
*. Removestar makes this easy by finding which names come
* imports and replacing the import lines in the file automatically.
Suppose you have a module
mymod/ | __init__.py | a.py | b.py
# mymod/a.py from .b import * def func(x): return x + y
# mymod/b.py x = 1 y = 2
removestar works like:
$ removestar mymod/ --- original/mymod/a.py +++ fixed/mymod/a.py @@ -1,5 +1,5 @@ # mymod/a.py -from .b import * +from .b import y def func(x): return x + y
This does not edit
a.py by default. The
-i flag causes it to edit
$ removestar -i mymod/ $ cat mymod/a.py # mymod/a.py from .b import y def func(x): return x + y
Command line options
$ removestar --help usage: removestar [-h] [-i] [--version] [--no-skip-init] [--no-dynamic-importing] [-v] [-q] [--max-line-length MAX_LINE_LENGTH] paths [paths ...] Tool to automatically replace "import *" imports with explicit imports Requires pyflakes. Usage: $ removestar file.py # Shows diff but does not edit file.py $ removestar -i file.py # Edits file.py in-place $ removestar -i module/ # Modifies every Python file in module/ recursively positional arguments: paths Files or directories to fix optional arguments: -h, --help show this help message and exit -i, --in-place Edit the files in-place. (default: False) --version Show removestar version number and exit. --no-skip-init Don't skip __init__.py files (they are skipped by default) (default: True) --no-dynamic-importing Don't dynamically import modules to determine the list of names. This is required for star imports from external modules and modules in the standard library. (default: True) -v, --verbose Print information about every imported name that is replaced. (default: False) -q, --quiet Don't print any warning messages. (default: False) --max-line-length MAX_LINE_LENGTH The maximum line length for replaced imports before they are wrapped. Set to 0 to disable line wrapping. (default: 100)
See the CHANGELOG file.
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