本文主要是介绍google python class exercise，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
谷歌 python class 地址 ： https://developers.google.com/edu/python/
美国名字： http://www.socialsecurity.gov/OACT/babynames/
1 string1.py
string 拼接的时候，比较难搞
c = a + b 这种方式不能用，不知道为什么！！！
#!/usr/bin/python -tt
# Copyright 2010 Google Inc.
# Licensed under the Apache License, Version 2.0
# http://www.apache.org/licenses/LICENSE-2.0# Google's Python Class
# http://code.google.com/edu/languages/google-python-class/# Basic string exercises
# Fill in the code for the functions below. main() is already set up
# to call the functions with a few different inputs,
# printing 'OK' when each function is correct.
# The starter code for each function includes a 'return'
# which is just a placeholder for your code.
# It's ok if you do not complete all the functions, and there
# are some additional functions to try in string2.py.# A. donuts
# Given an int count of a number of donuts, return a string
# of the form 'Number of donuts: <count>', where <count> is the number
# passed in. However, if the count is 10 or more, then use the word 'many'
# instead of the actual count.
# So donuts(5) returns 'Number of donuts: 5'
# and donuts(23) returns 'Number of donuts: many'
def donuts(count):# +++your code here+++if count <= 9: return "Number of donuts: %d" % countelse:return "Number of donuts: many"# B. both_ends
# Given a string s, return a string made of the first 2
# and the last 2 chars of the original string,
# so 'spring' yields 'spng'. However, if the string length
# is less than 2, return instead the empty string.
def both_ends(s):# +++your code here+++if len(s)<2:return ''else:return s[0:2] + s[-2:]# C. fix_start
# Given a string s, return a string
# where all occurences of its first char have
# been changed to '*', except do not change
# the first char itself.
# e.g. 'babble' yields 'ba**le'
# Assume that the string is length 1 or more.
# Hint: s.replace(stra, strb) returns a version of string s
# where all instances of stra have been replaced by strb.
def fix_start(s):# +++your code here+++first_char = s[0]repl = s.replace(s[0], "*")s = s[0] + repl[1:]return s# D. MixUp
# Given strings a and b, return a single string with a and b separated
# by a space '<a> <b>', except swap the first 2 chars of each string.
# e.g.
# 'mix', pod' -> 'pox mid'
# 'dog', 'dinner' -> 'dig donner'
# Assume a and b are length 2 or more.
def mix_up(a, b):# +++your code here+++a_tmp = a[0:2] + b[2:]b_tmp = b[0:2] + a[2:]return_tmp = "%s %s" % (b_tmp, a_tmp)return return_tmp# Provided simple test() function used in main() to print
# what each function returns vs. what it's supposed to return.
def test(got, expected):if got == expected:prefix = ' OK 'else:prefix = ' X 'print '%s got: %s expected: %s' % (prefix, repr(got), repr(expected))# Provided main() calls the above functions with interesting inputs,
# using test() to check if each result is correct or not.
def main():print 'donuts'# Each line calls donuts, compares its result to the expected for that call.test(donuts(4), 'Number of donuts: 4')test(donuts(9), 'Number of donuts: 9')test(donuts(10), 'Number of donuts: many')test(donuts(99), 'Number of donuts: many')printprint 'both_ends'test(both_ends('spring'), 'spng')test(both_ends('Hello'), 'Helo')test(both_ends('a'), '')test(both_ends('xyz'), 'xyyz')printprint 'fix_start'test(fix_start('babble'), 'ba**le')test(fix_start('aardvark'), 'a*rdv*rk')test(fix_start('google'), 'goo*le')test(fix_start('donut'), 'donut')printprint 'mix_up'test(mix_up('mix', 'pod'), 'pox mid')test(mix_up('dog', 'dinner'), 'dig donner')test(mix_up('gnash', 'sport'), 'spash gnort')test(mix_up('pezzy', 'firm'), 'fizzy perm')# Standard boilerplate to call the main() function.
if __name__ == '__main__':main()
2，list
#!/usr/bin/python -tt
# Copyright 2010 Google Inc.
# Licensed under the Apache License, Version 2.0
# http://www.apache.org/licenses/LICENSE-2.0# Google's Python Class
# http://code.google.com/edu/languages/google-python-class/# Basic list exercises
# Fill in the code for the functions below. main() is already set up
# to call the functions with a few different inputs,
# printing 'OK' when each function is correct.
# The starter code for each function includes a 'return'
# which is just a placeholder for your code.
# It's ok if you do not complete all the functions, and there
# are some additional functions to try in list2.py.# A. match_ends
# Given a list of strings, return the count of the number of
# strings where the string length is 2 or more and the first
# and last chars of the string are the same.
# Note: python does not have a ++ operator, but += works.
def match_ends(words):# +++your code here+++match_cnt = 0for var in words:if len(var)>=2:if var[0] == var[-1]:match_cnt += 1return match_cnt# B. front_x
# Given a list of strings, return a list with the strings
# in sorted order, except group all the strings that begin with 'x' first.
# e.g. ['mix', 'xyz', 'apple', 'xanadu', 'aardvark'] yields
# ['xanadu', 'xyz', 'aardvark', 'apple', 'mix']
# Hint: this can be done by making 2 lists and sorting each of them
# before combining them.def front_x(words):# +++your code here+++words_z=[];words_abc=[];for var in words:if var[0] == "x":words_z.append(var)else :words_abc.append(var)return sorted(words_z) + sorted(words_abc)
# words_abc = sorted(words_abc)
# print words_abc
# words_z = sorted(words_z)
# print words_z
# words_z.extend(words_abc)
# print words_z
# return words_z# C. sort_last
# Given a list of non-empty tuples, return a list sorted in increasing
# order by the last element in each tuple.
# e.g. [(1, 7), (1, 3), (3, 4, 5), (2, 2)] yields
# [(2, 2), (1, 3), (3, 4, 5), (1, 7)]
# Hint: use a custom key= function to extract the last element form each tuple.
def Last_char(s):return s[-1]def sort_last(tuples):# +++your code here+++return sorted(tuples, key=Last_char)# Simple provided test() function used in main() to print
# what each function returns vs. what it's supposed to return.
def test(got, expected):if got == expected:prefix = ' OK 'else:prefix = ' X 'print '%s got: %s expected: %s' % (prefix, repr(got), repr(expected))# Calls the above functions with interesting inputs.
def main():print 'match_ends'test(match_ends(['aba', 'xyz', 'aa', 'x', 'bbb']), 3)test(match_ends(['', 'x', 'xy', 'xyx', 'xx']), 2)test(match_ends(['aaa', 'be', 'abc', 'hello']), 1)printprint 'front_x'test(front_x(['bbb', 'ccc', 'axx', 'xzz', 'xaa']),['xaa', 'xzz', 'axx', 'bbb', 'ccc'])test(front_x(['ccc', 'bbb', 'aaa', 'xcc', 'xaa']),['xaa', 'xcc', 'aaa', 'bbb', 'ccc'])test(front_x(['mix', 'xyz', 'apple', 'xanadu', 'aardvark']),['xanadu', 'xyz', 'aardvark', 'apple', 'mix'])printprint 'sort_last'test(sort_last([(1, 3), (3, 2), (2, 1)]),[(2, 1), (3, 2), (1, 3)])test(sort_last([(2, 3), (1, 2), (3, 1)]),[(3, 1), (1, 2), (2, 3)])test(sort_last([(1, 7), (1, 3), (3, 4, 5), (2, 2)]),[(2, 2), (1, 3), (3, 4, 5), (1, 7)])if __name__ == '__main__':main()
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