parameters: (logical_line, previous_logical, indent_char,
                  indent_level, previous_indent_level)
docstring: r"""Use 4 spaces per indentation level.
  
      For really old code that you don't want to mess up, you can continue to
      use 8-space tabs.
  
      Okay: a = 1
      Okay: if a == 0:\n    a = 1
      E111:   a = 1
      E114:   # a = 1
  
      Okay: for item in items:\n    pass
      E112: for item in items:\npass
      E115: for item in items:\n# Hi\n    pass
  
      Okay: a = 1\nb = 2
      E113: a = 1\n    b = 2
      E116: a = 1\n    # b = 2
docstring_summary: r"""Use 4 spaces per indentation level.
docstring_tokens: r Use 4 spaces per indentation level .
function: def indentation(logical_line, previous_logical, indent_char,
                  indent_level, previous_indent_level):
      r"""Use 4 spaces per indentation level.
  
      For really old code that you don't want to mess up, you can continue to
      use 8-space tabs.
  
      Okay: a = 1
      Okay: if a == 0:\n    a = 1
      E111:   a = 1
      E114:   # a = 1
  
      Okay: for item in items:\n    pass
      E112: for item in items:\npass
      E115: for item in items:\n# Hi\n    pass
  
      Okay: a = 1\nb = 2
      E113: a = 1\n    b = 2
      E116: a = 1\n    # b = 2
      """
      c = 0 if logical_line else 3
      tmpl = "E11%d %s" if logical_line else "E11%d %s (comment)"
      if indent_level % 4:
          yield 0, tmpl % (1 + c, "indentation is not a multiple of four")
      indent_expect = previous_logical.endswith(':')
      if indent_expect and indent_level <= previous_indent_level:
          yield 0, tmpl % (2 + c, "expected an indented block")
      elif not indent_expect and indent_level > previous_indent_level:
          yield 0, tmpl % (3 + c, "unexpected indentation")
function_tokens: def indentation ( logical_line , previous_logical , indent_char , indent_level , previous_indent_level ) : c = 0 if logical_line else 3 tmpl = "E11%d %s" if logical_line else "E11%d %s (comment)" if indent_level % 4 : yield 0 , tmpl % ( 1 + c , "indentation is not a multiple of four" ) indent_expect = previous_logical . endswith ( ':' ) if indent_expect and indent_level <= previous_indent_level : yield 0 , tmpl % ( 2 + c , "expected an indented block" ) elif not indent_expect and indent_level > previous_indent_level : yield 0 , tmpl % ( 3 + c , "unexpected indentation" )