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automatic code formatter for python following pep8 using baron FST, like gofmt

Project Description


Pyfmt is an autoformatting source code tool for python, in more or less the same spirit than gofmt. It follows the pep8 and uses Baron to do its work in one pass.

``Pyfmt`` is in its early stage of developpement, it already do a good job at formatting most of python code but it doesn’t handle yet splitting a too long line and might end up putting back into one line a line that you have split. But it should be fine for ~80% of the cases.

Feedback is very welcome.

You can see it in action here.


PyFmt can be installed using $ pip install pyfmt


pyfmt  # output to standard output
pyfmt -i  # replace the content of the file, like -i of sed

From python:

from pyfmt import format_code



You can reach us on


You can run the tests using $ py.test


Things that pyfmt do (if it’s not already done in the code):

  • render ALL nodes of the python language according to the pep8
  • if a datastructure is indented, keep the indentation and indent it according to the pep8
  • put 2 spaces before comments after code, put a space after the “#” of the comment (don’t do for shebang)
  • split compound statements written on one line on two lines (example: if a: pass -> if a:\n pass”, same for every other statements that wait for a block of code)
  • replace stuff by repr(stuff)
  • split multiple import across multiple lines
  • replace tabs with space
  • correctly indent the whole file using 4 spaces
  • convert windows '\r\n’ to '\n'
  • if not present, put two blank lines around functions or class definitions at the root level of the file
  • if not present, put one blank line around method definition in a class
  • replace <> with !=

Things that pyfmt don’t do or don’t do yet and that can be annoying:

  • properly formatting the content of a “from x import (lot of stuff)”
  • properly splitting too long lines, it may ends up putting back on one line a splited line
  • removing extra blank lines


0.1 (2014-09-07)

  • Init

Release History

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