Python standard library: Built-in function Frozenset ([iterable])

This function returns a frozen collection. The so-called freeze is that this collection can no longer add or remove elements from any collection. So the difference between set and set is that set is the element that can be added or deleted, and frozenset not. The main function of Frozenset is fast, which is realized by using hash algorithm. The parameter iterable is an object that represents an iteration, such as a list, a dictionary, a tuple, and so on.

Example:

#frozenset () L = [1, 2, 3, 4, 5, 6, 6, 7, 8, 8, 9]print (Len (L), l) set = Frozenset (l) print (Len (set), set)

The resulting output is as follows:

11 [1, 2, 3, 4, 5, 6, 6, 7, 8, 8, 9]

9 Frozenset ({1, 2, 3, 4, 5, 6, 7, 8, 9})

Cai Junsheng qq:9073204 Shenzhen

Python standard library: Built-in function Frozenset ([iterable])