Detailed introduction to Python’s built-in frozenset function

English documentation:

• class frozenset([iterable ])

• ##Return a new

  frozenset object, optionally with elements taken from iterable. frozenset is a built-in class. See frozenset and Set Types — set, frozenset for documentation about this class.

• For other containers see the built-in

  set, list, tuple, and dict classes, as well as the collections module.

• 
  

• ##Description:

1. Pass in an iterable object and generate a new immutable collection.

• >>> a = frozenset(range(10))
  >>> a
  frozenset({0, 1, 2, 3, 4, 5, 6, 7, 8, 9})
  >>> b = frozenset('I am a Pythoner')
  >>> b
  frozenset({'y', 'I', ' ', 'r', 't', 'm', 'h', 'o', 'a', 'e', 'n', 'P'})

2. When no parameters are passed in, an empty immutable collection is generated.

>>> c = frozenset()
>>> c
frozenset()

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