Error running flake8 [duplicate]

Question

I recently tried to install Flake8 for Python3 and since then I'm getting the following error message:

/Users/dorsam/.atom/packages/linter/lib/linter-registry.js:159 [Linter] Error running Flake8 Error: /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pycodestyle.py:113: FutureWarning: Possible nested set at position 1
  EXTRANEOUS_WHITESPACE_REGEX = re.compile(r'[[({] | []}),;:]')
    at ChildProcess.<anonymous> (/Users/dorsam/.atom/packages/linter-flake8/node_modules/sb-exec/lib/index.js:56:20)
    at emitTwo (events.js:126:13)
    at ChildProcess.emit (events.js:214:7)
    at maybeClose (internal/child_process.js:925:16)
    at Socket.stream.socket.on (internal/child_process.js:346:11)
    at emitOne (events.js:116:13)
    at Socket.emit (events.js:211:7)
    at Pipe._handle.close [as _onclose] (net.js:554:12)

Answer 1

Look here: https://docs.python.org/3/library/re.html

Support of nested sets and set operations as in Unicode Technical Standard #18 might be added in the future. This would change the syntax, so to facilitate this change a FutureWarning will be raised in ambiguous cases for the time being. That includes sets starting with a literal '[' or containing literal character sequences '--', '&&', '~~', and '||'. To avoid a warning escape them with a backslash.