parameters: (iterable, key=None)
docstring: List unique elements, preserving order. Remember all elements ever seen.
docstring_summary: List unique elements, preserving order. Remember all elements ever seen.
docstring_tokens: List unique elements preserving order . Remember all elements ever seen .
function: def _unique_everseen(iterable, key=None):
      "List unique elements, preserving order. Remember all elements ever seen."
      # unique_everseen('AAAABBBCCDAABBB') --> A B C D
      # unique_everseen('ABBCcAD', str.lower) --> A B C D
      seen = set()
      seen_add = seen.add
      if key is None:
          for element in filterfalse(seen.__contains__, iterable):
              seen_add(element)
              yield element
      else:
          for element in iterable:
              k = key(element)
              if k not in seen:
                  seen_add(k)
                  yield element
function_tokens: def _unique_everseen ( iterable , key = None ) : # unique_everseen('AAAABBBCCDAABBB') --> A B C D # unique_everseen('ABBCcAD', str.lower) --> A B C D seen = set ( ) seen_add = seen . add if key is None : for element in filterfalse ( seen . __contains__ , iterable ) : seen_add ( element ) yield element else : for element in iterable : k = key ( element ) if k not in seen : seen_add ( k ) yield element