PyCharm Flake8 Configuration XML that uses current virtualenv interpreter.

readme.txt

How to manually setup flake8 as PyCharm external tool

File / Settings / Tools / External Tools / Add
Name: Flake8
Program: $PyInterpreterDirectory$/python
Parameters: -m flake8 --max-complexity 10 --ignore E501 $FilePath$
Working directory: $ProjectFileDir$

Output Filters / Add
Name: Filter 1
Regular expression to match output:
$FILE_PATH$\:$LINE$\:$COLUMN$\:.*

Output Filters / Add
Name: Filter 2
Regular expression to match output:
$FILE_PATH$\:$LINE$\:.*

To check source with flake8:
Tools / External Tools / Flake8

Can be used with single files as well as with directories, recursively.

flake8.xml

<toolSet name="Code Checking">
  <tool name="Flake8" showInMainMenu="true" showInEditor="true" showInProject="true" showInSearchPopup="true" disabled="false" useConsole="true" showConsoleOnStdOut="false" showConsoleOnStdErr="false" synchronizeAfterRun="true">
    <exec>
      <option name="COMMAND" value="$PyInterpreterDirectory$/python" />
      <option name="PARAMETERS" value="-m flake8 --max-complexity 10 --ignore E501 $FilePath$" />
      <option name="WORKING_DIRECTORY" value="$ProjectFileDir$" />
    </exec>
    <filter>
      <option name="NAME" value="Filter 1" />
      <option name="DESCRIPTION" />
      <option name="REGEXP" value="$FILE_PATH$\:$LINE$\:$COLUMN$\:.*" />
    </filter>
    <filter>
      <option name="NAME" value="Filter 2" />
      <option name="DESCRIPTION" />
      <option name="REGEXP" value="$FILE_PATH$\:$LINE$\:.*" />
    </filter>
  </tool>
</toolSet>