class_docstr: An OrderedSet is a custom MutableSet that remembers its order, so that
  every entry has an index that can be looked up.
  
  Example:
      >>> OrderedSet([1, 1, 2, 3, 2])
      OrderedSet([1, 2, 3])
class_docstr_tok: ["An","OrderedSet","is","a","custom","MutableSet","that","remembers","its","order",",","so","that","every","entry","has","an","index","that","can","be","looked","up",".","Example",":",">",">",">","OrderedSet","(","[","1",",","1",",","2",",","3",",","2","]",")","OrderedSet","(","[","1",",","2",",","3","]",")"]
docstr: Test if the item is in this ordered set
  
  Example:
      >>> 1 in OrderedSet([1, 3, 2])
      True
      >>> 5 in OrderedSet([1, 3, 2])
      False
docstr_tok: ["Test","if","the","item","is","in","this","ordered","set","Example",":",">",">",">","1","in","OrderedSet","(","[","1",",","3",",","2","]",")","True",">",">",">","5","in","OrderedSet","(","[","1",",","3",",","2","]",")","False"]
code: def __contains__(self, key):
      """
      Test if the item is in this ordered set
  
      Example:
          >>> 1 in OrderedSet([1, 3, 2])
          True
          >>> 5 in OrderedSet([1, 3, 2])
          False
      """
      return key in self.map
  
imports: import itertools
  from collections import deque
label_desc: Use image node_id 7 for calling the OrderedSet obj's underlying member method code with example usage: obj.__contains__(key) and returns: unknown