A flake8 and Pylama plugin that checks the ordering of your imports. It does not check anything else about the imports. Merely that they are grouped and ordered correctly.
In general stdlib comes first, then 3rd party, then local packages, and that each group is individually alphabetized, however this depends on the style used. Flake8-Import-Order supports a number of styles and is extensible allowing for custom styles.
This plugin was originally developed to match the style preferences of the cryptography project, with this style remaining the default.
This package adds 4 new flake8 warnings
I100: Your import statements are in the wrong order.I101: The names in your from import are in the wrong order.I201: Missing newline between import groups.I202: Additional newline in a group of imports.
The following styles are directly supported,
cryptography- see an examplegoogle- style described in Google Style Guidelines, see an examplesmarkets- style asgoogleonly with import statements before from X import ... statements, see an exampleappnexus- style asgoogleonly with import statements for packages local to your company or organisation coming after import statements for third-party packages, see an exampleedited- see an examplepycharm- style assmarketsonly with case sensitive sorting imported namespep8- style that only enforces groups without enforcing the order within the groups
You can also add your own style by extending Style
class.
You will want to set the application-import-names option to a
comma separated list of names that should be considered local to your
application. These will be used to help categorise your import
statements into the correct groups. Note that relative imports are
always considered local.
You will want to set the application-package-names option to a
comma separated list of names that should be considered local to your
company or organisation, but which are obtained using some sort of
package manager like Pip, Apt, or Yum. Typically, code representing
the values listed in this option is located in a different repository
than the code being developed. This option is only accepted in the
supported appnexus or edited styles or in any style that
accepts application package names.
The application-import-names and application-package-names can
contain namespaced packages or even exact nested module names. (This
is possible with 0.16 onwards).
import-order-style controls what style the plugin follows
(cryptography is the default).
Currently these checks are limited to module scope imports only. Conditional imports in module scope will also be ignored.
Classification of an imported module is achieved by checking the
module against a stdlib list and then if there is no match against the
application-import-names list and application-package-names if
the style accepts application-package names. Only if none of these
lists contain the imported module will it be classified as third
party.
These checks only consider an import against its previous import,
rather than considering all the imports together. This means that
I100 errors are only raised for the latter of adjacent imports out
of order. For example,
import X.B
import X # I100
import X.Aonly import X raises an I100 error, yet import X.A is also
out of order compared with the import X.B.
Imported modules are classified as stdlib if the module is in a vendored list of stdlib modules. This list is based on the latest release of Python and hence the results can be misleading. This list is also the same for all Python versions because otherwise it would be impossible to write programs that work under both Python 2 and 3 and pass the import order check.
The I202 check will consider any blank line between imports to
count, even if the line is not contextually related to the
imports. For example,
import logging
try:
from logging import NullHandler
except ImportError:
class NullHandler(logging.Handler):
"""Shim for version of Python < 2.7."""
def emit(self, record):
pass
import sys # I202 due to the blank line before the 'def emit'will trigger a I202 error despite the blank line not being
contextually related.
You can add your own style by extending flake8_import_order.styles.Style
class. Here's an example:
from flake8_import_order.styles import Cryptography
class ReversedCryptography(Cryptography):
# Note that Cryptography is a subclass of Style.
@staticmethod
def sorted_names(names):
return reversed(Cryptography.sorted_names(names))By default there are five import groupings or sections; future,
stdlib, third party, application, and relative imports. A style can
choose to accept another grouping, application-package, by setting the
Style class variable accepts_application_package_names to
True, e.g.
class PackageNameCryptography(Cryptography):
accepts_application_package_names = TrueTo make flake8-import-order able to discover your extended style, you need to
register it as flake8_import_order.styles using setuptools' entry points
mechanism:
# setup.py of your style package
setup(
name='flake8-import-order-reversed-cryptography',
...,
entry_points={
'flake8_import_order.styles': [
'reversed = reversedcryptography:ReversedCryptography',
# 'reversed' is a style name. You can pass it to
# --import-order-style option
# 'reversedcryptography:ReversedCryptography' is an import path
# of your extended style class.
]
}
)
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