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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
import random
def nested_sum(t):
    """Computes the total of all numbers in a list of lists.
    t: list of list of numbers
    returns: number
    total = 0
    for nested in t:
        total += sum(nested)
    return total
def cumsum(t):
    """Computes the cumulative sum of the numbers in t.
    t: list of numbers
    returns: list of numbers
    total = 0
    res = []
    for x in t:
        total += x
        res.append(total)
    return res
def middle(t):
    """Returns all but the first and last elements of t.
    t: list
    returns: new list
    return t[1:-1]
def chop(t):
    """Removes the first and last elements of t.
    t: list
    returns: None
    del t[0]
    del t[-1]
def is_sorted(t):
    """Checks whether a list is sorted.
    t: list
    returns: boolean
    return t == sorted(t)
def is_anagram(word1, word2):
    """Checks whether two words are anagrams
    word1: string or list
    word2: string or list
    returns: boolean
    return sorted(word1) == sorted(word2)
def has_duplicates(s):
    """Returns True if any element appears more than once in a sequence.
    s: string or list
    returns: bool
    # make a copy of t to avoid modifying the parameter
    t = list(s)
    t.sort()
    # check for adjacent elements that are equal
    for i in range(len(t)-1):
        if t[i] == t[i+1]:
            return True
    return False
def main():
    t = [[1, 2], [3], [4, 5, 6]]
    print(nested_sum(t))
    t = [1, 2, 3]
    print(cumsum(t))
    t = [1, 2, 3, 4]
    print(middle(t))
    chop(t)
    print(t)
    print(is_sorted([1, 2, 2]))
    print(is_sorted(['b', 'a']))
    print(is_anagram('stop', 'pots'))
    print(is_anagram('different', 'letters'))
    print(is_anagram([1, 2, 2], [2, 1, 2]))
    print(has_duplicates('cba'))
    print(has_duplicates('abba'))
if __name__ == '__main__':

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