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"""This module contains a code example related to

Think Python, 2nd Edition

by Allen Downey

http://thinkpython2.com

Copyright 2015 Allen Downey

License: http://creativecommons.org/licenses/by/4.0/

"""

from __future__ import print_function, division

def has_duplicates(t):

"""Checks whether any element appears more than once in a sequence.

Simple version using a for loop.

t: sequence

"""

d = {}

for x in t:

if x in d:

return True

d[x] = True

return False

def has_duplicates2(t):

"""Checks whether any element appears more than once in a sequence.

Faster version using a set.

t: sequence

"""

return len(set(t)) < len(t)

if __name__ == '__main__':

t = [1, 2, 3]

print(has_duplicates(t))

t.append(1)

print(has_duplicates(t))

t = [1, 2, 3]

print(has_duplicates2(t))

t.append(1)

print(has_duplicates2(t))