pep8radius

PEP8 clean only the parts of the files touched since the last commit, a previous commit or (the merge-base of) a branch.

Fixing the entire project of PEP8 infractions ("PEP8 storms") can lead to merge conflicts, add noise to merges / pull requests and break (git) blame. pep8radius solves this problem by fixing only those PEP8 infractions incontained on the lines of the project which you've been working, leaving these sections "better than you found it" whilst keeping your commits focused on the areas of the codebase you were actually working on.

Requirements

pep8radius uses autopep8, and in turn pep8. The docformatter option, to fix docstrings, uses docformatter.

You can also use yapf as an alternative back-end.

Installation

From pip:

$ pip install pep8radius

Usage

• Move to project directory
• Make some changes to the project
• Run pep8radius --diff # view a diff of proposed fixed
• Run pep8radius --in-place # apply the fixes
• Commit your changes

Against a branch you can use the same syntax as with git diff:

$ pep8radius master   # branch name to compare against (compares against merge-base)
$ pep8radius c12166f  # commit hash

$ pep8radius master --in-place  # these work with other options too

You can also fix docstrings (PEP257) using the docformatter option:

$ pep8radius --docformatter --diff

Note: can also use btyfi alias for pep8radius.

---

It can be nice to pipe the diff to cdiff (which makes diffs pretty and has lots of options):

$ pep8radius --diff --no-color | cdiff
$ pep8radius --diff --no-color | cdiff --side-by-side

You can get strange results if you don't use no-color.
I actually use the following git alias (which allows git rad and git rad -i):

[alias]
    rad = !pep8radius master --diff --no-color $@ | cdiff --side-by-side

which outputs the corrections as follows:

---

You can pipe in a diff directly, to fix the lines modified in it with --from-diff (this is somewhat experimental, please report failing diffs!).
For example:

$ git diff master | pep8radius --diff --from-diff=-

yapf

To use yapf as an alternative back-end, you can pass the --yapf option:

$ pep8radius master --diff --yapf

$ pep8radius master --diff --yapf --style=google

Note: This ignores autopep8 and docformatter specific arguments.

Config Files

pep8radius looks for configuration files as described in the pep8 docs.

At the project level, you may have a setup.cfg which includes a pep8 section, you can use this to define defaults for pep8radius and autopep8:

[pep8]
rev = master
ignore = E226,E302,E41
max-line-length = 160

By default, this will look for a user level default, you can suppress this by passing a blank to global_config:

[pep8]
rev = staging
global_config =

or perhaps you want to use yapf with google style:

[pep8]
rev = master
yapf = True
style = google

Note: style can also be a config file, or a dict (see the yapf docs).

VCS Support

Git, Mecurial (hg), (tentatively) Bazaar. Please request support for other version control systems on github.

Options

$ pep8radius --help

usage: pep8radius [-h] [--version] [-d] [-i] [--no-color] [-v]
                  [--from-diff DIFF] [-p n] [-a] [--experimental]
                  [--exclude globs] [--list-fixes] [--ignore errors]
                  [--select errors] [--max-line-length n] [--indent-size n]
                  [-f] [--no-blank] [--pre-summary-newline] [--force-wrap]
                  [--global-config GLOBAL_CONFIG] [--ignore-local-config]
                  [rev]

PEP8 clean only the parts of the files which you have touched since the last
commit, a previous commit or (the merge-base of) a branch.

positional arguments:
  rev                   commit or name of branch to compare against

optional arguments:
  -h, --help            show this help message and exit
  --version             print version number and exit
  -d, --diff            print the diff of fixed source vs original
  -i, --in-place        make the fixes in place; modify the files
  --no-color            do not print diffs in color (default is to use color)
  -v, --verbose         print verbose messages; multiple -v result in more
                        verbose messages (one less -v is passed to autopep8)
  --from-diff DIFF      Experimental: rather than calling out to version
                        control, just pass in a diff; the modified lines will
                        be fixed

pep8:
  Pep8 options to pass to autopep8.

  -p n, --pep8-passes n
                        maximum number of additional pep8 passes (default:
                        infinite)
  -a, --aggressive      enable non-whitespace changes; multiple -a result in
                        more aggressive changes
  --experimental        enable experimental fixes
  --exclude globs       exclude file/directory names that match these comma-
                        separated globs
  --list-fixes          list codes for fixes and exit; used by --ignore and
                        --select
  --ignore errors       do not fix these errors/warnings (default: E24)
  --select errors       fix only these errors/warnings (e.g. E4,W)
  --max-line-length n   set maximum allowed line length (default: 79)
  --indent-size n       number of spaces per indent level (default 4)

docformatter:
  Fix docstrings for PEP257.

  -f, --docformatter    Use docformatter
  --no-blank            Do not add blank line after description
  --pre-summary-newline
                        add a newline before the summary of a multi-line
                        docstring
  --force-wrap          force descriptions to be wrapped even if it may result
                        in a mess

config:
  Change default options based on global or local (project) config files.

  --global-config filename
                        path to global pep8 config file; if this file does not
                        exist then this is ignored (default: ~/.config/pep8)
  --ignore-local-config
                        don't look for and apply local config files; if not
                        passed, defaults are updated with any config files in
                        the project's root dir

yapf:
  Options for yapf, alternative to autopep8. Currently any other options are
  ignored.

  -y, --yapf            Use yapf rather than autopep8. This ignores other
                        arguments outside of this group.
  --style               style either pep8, google, name of file with
                        stylesettings, or a dict

Run before you commit, against a previous commit or branch before merging.

For more information about these options see autopep8.

As a module

Pep8radius also exports lightweight wrappers around autopep8 so that you can fix line ranges of your code with fix_code or fix_file.

Here's the example "bad code" from autopep8's README:

import math, sys;

def example1():
    ####This is a long comment. This should be wrapped to fit within 72 characters.
    some_tuple=(   1,2, 3,'a'  );
    some_variable={'long':'Long code lines should be wrapped within 79 characters.',
    'other':[math.pi, 100,200,300,9876543210,'This is a long string that goes on'],
    'more':{'inner':'This whole logical line should be wrapped.',some_tuple:[1,
    20,300,40000,500000000,60000000000000000]}}
    return (some_tuple, some_variable)
def example2(): return {'has_key() is deprecated':True}.has_key({'f':2}.has_key(''));
class Example3(   object ):
    def __init__    ( self, bar ):
     #Comments should have a space after the hash.
     if bar : bar+=1;  bar=bar* bar   ; return bar
     else:
                    some_string = """
               Indentation in multiline strings should not be touched.
Only actual code should be reindented.
"""
                    return (sys.path, some_string)

You can pep8 fix just the line ranges 1-1 (the imports) and 12-21 (the Example3class) with pep8radius.fix_code(code, [(1, 1), (12, 21)]) (where code is a string of the above), which returns the code fixed within those ranges:

import math
import sys

def example1():
    ####This is a long comment. This should be wrapped to fit within 72 characters.
    some_tuple=(   1,2, 3,'a'  );
    some_variable={'long':'Long code lines should be wrapped within 79 characters.',
    'other':[math.pi, 100,200,300,9876543210,'This is a long string that goes on'],
    'more':{'inner':'This whole logical line should be wrapped.',some_tuple:[1,
    20,300,40000,500000000,60000000000000000]}}
    return (some_tuple, some_variable)
def example2(): return {'has_key() is deprecated':True}.has_key({'f':2}.has_key(''));


class Example3(object):

    def __init__(self, bar):
        # Comments should have a space after the hash.
        if bar:
            bar += 1
            bar = bar * bar
            return bar
        else:
            some_string = """
                       Indentation in multiline strings should not be touched.
Only actual code should be reindented.
"""
            return (sys.path, some_string)

You can use fix_file to do this directly on a file, which gives you the option of doing this in place.

pep8radius.fix_code('code.py', [(1, 1), (12, 21)], in_place=True)

You can also pass the same arguments to pep8radius script itself using the parse_args. For example ignoring long lines (E501) and use the options from your global config files:

args = pep8radius.parse_args(['--ignore=E501', '--ignore-local-config'],
                             apply_config=True)
pep8radius.fix_code(code, [(1, 1), (12, 21)], options=args)