习题26 恭喜你，现在可以考试了！

从 Zed 的网站 http://learnpythonthehardway.org/book/ex26.html 下载的源代码，要求改错！这是实战练习

先看源代码

def break_words(stuff):
"""This function will break up words for us."""
words = stuff.split(' ')
return words

def sort_words(words):
"""Sorts the words."""
return sorted(words)

def print_first_word(words)
"""Prints the first word after popping it off."""
word = words.poop(0)
print word

def print_last_word(words):
"""Prints the last word after popping it off."""
word = words.pop(-1
print word

def sort_sentence(sentence):
"""Takes in a full sentence and returns the sorted words."""
words = break_words(sentence)
return sort_words(words)

def print_first_and_last(sentence):
"""Prints the first and last words of the sentence."""
words = break_words(sentence)
print_first_word(words)
print_last_word(words)

def print_first_and_last_sorted(sentence):
"""Sorts the words then prints the first and last one."""
words = sort_sentence(sentence)
print_first_word(words)
print_last_word(words)

print "Let's practice everything."
print 'You\'d need to know \'bout escapes with \\ that do \n newlines and \t tabs.'

poem = """
\tThe lovely world
with logic so firmly planted
cannot discern \n the needs of love
nor comprehend passion from intuition
and requires an explantion
\n\t\twhere there is none.
"""

print "--------------"
print poem
print "--------------"

five = 10 - 2 + 3 - 5
print "This should be five: %s" % five

def secret_formula(started):
jelly_beans = started * 500
jars = jelly_beans \ 1000
crates = jars / 100
return jelly_beans, jars, crates

start_point = 10000
beans, jars, crates == secret_formula(start-point)

print "With a starting point of: %d" % start_point
print "We'd have %d jeans, %d jars, and %d crates." % (beans, jars, crates)

start_point = start_point / 10

print "We can also do that this way:"
print "We'd have %d beans, %d jars, and %d crabapples." % secret_formula(start_pont

sentence = "All god\tthings come to those who weight."

words = ex25.break_words(sentence)
sorted_words = ex25.sort_words(words)

print_first_word(words)
print_last_word(words)
.print_first_word(sorted_words)
print_last_word(sorted_words)
sorted_words = ex25.sort_sentence(sentence)
prin sorted_words

print_irst_and_last(sentence)

print_first_a_last_sorted(senence)

“这个习题的目的不是写程序，而是修改现有的程序。”

======================================================================================

修改后的代码如下

#-*-coding:utf-8-*-
def break_words(stuff):
"""This function will break up words for us."""
words = stuff.split(' ')
return words

def sort_words(words):
"""Sorts the words."""
return sorted(words)

def print_first_word(words):  #这里少了一个冒号
"""Prints the first word after popping it off."""
word = words.pop(0) #poop变成pop
print word

def print_last_word(words):
"""Prints the last word after popping it off."""
word = words.pop(-1)  #这里少了一个后括号
print word

def sort_sentence(sentence):
"""Takes in a full sentence and returns the sorted words."""
words = break_words(sentence)
return sort_words(words)

def print_first_and_last(sentence):
"""Prints the first and last words of the sentence."""
words = break_words(sentence)
print_first_word(words)
print_last_word(words)

def print_first_and_last_sorted(sentence):
"""Sorts the words then prints the first and last one."""
words = sort_sentence(sentence)
print_first_word(words)
print_last_word(words)

print "Let's practice everything."
print 'You\'d need to know \'bout escapes with \\ that do \n newlines and \t tabs.'

poem = """
\tThe lovely world
with logic so firmly planted
cannot discern \n the needs of love
nor comprehend passion from intuition
and requires an explantion
\n\t\twhere there is none.
"""

print "--------------"
print poem
print "--------------"

five = 10 - 2 + 3 - 6 #减5变成减6
print "This should be five: %s" % five

def secret_formula(started):
jelly_beans = started * 500
jars = jelly_beans / 1000 #这里除号不对
crates = jars / 100
return jelly_beans, jars, crates

start_point = 10000
beans, jars, crates = secret_formula(start_point)  #这里应该是一个 = ，而且start point中间是下划线才对

print "With a starting point of: %d" % start_point
print "We'd have %d jeans, %d jars, and %d crates." % (beans, jars, crates)

start_point = start_point / 10

print "We can also do that this way:"
print "We'd have %d beans, %d jars, and %d crabapples." % secret_formula(start_point)
#这里少了一个后括号,而且point又打错了

import  ex25 #必须在sentence前面import才行！！！
sentence = "All good things come to those who weight."#  All good things come to those who weight.

words = ex25.break_words(sentence)
sorted_words = ex25.sort_words(words)

print_first_word(words)
print_last_word(words)
print_first_word(sorted_words)  #print前面多了一个点 .
print_last_word(sorted_words)
sorted_words = ex25.sort_sentence(sentence)
print sorted_words  #print 写成了 prin

print_first_and_last(sentence)  #first

print_first_and_last_sorted(sentence) #不可缩进，and  ，sentence

尤其要注意的是 import 的用法！！！

运行结果如下