ex26 纠正练习

　　题目中给出的代码如下：

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)
　　#后面少一个分号。
    """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
　　#上面少了半个括号
    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 - 5
print "This should be five: %s" % five

def secret_formula(started):
    jelly_beans = started * 500
    jars = jelly_beans \ 1000
#这里\应该为/，在一般情况下\代表转移。
    crates = jars / 100
    return jelly_beans, jars, crates

start_point = 10000
beans, jars, crates == secret_formula(start-point)
#这里面函数变量写错了，应该为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
#这一样少了一个括号。

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

words = ex25.break_words(sentence)
sorted_words = ex25.sort_words(words)
#本练习中没引进ex25，所有有两种修改方法import ex25，我选用的是去掉ex25.

print_first_word(words) print_last_word(words) .print_first_word(sorted_words)
#本行多了一个.
print_last_word(sorted_words)
sorted_words = ex25.sort_sentence(sentence)
#本练习中没引进ex25，所有有两种修改方法import ex25，我选用的是去掉ex25.
prin sorted_words
#上面的关键字print错误
print_irst_and_last(sentence)

   print_first_a_last_sorted(senence)
#上面一行缩进存在问题

修正后

#!/usr/bin/env python
# -*- coding:utf-8 -*-

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

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

def print_first_word(pf_words):
    """Prints the first word after popping it off."""
    pf_word = pf_words.pop(0)
    print pf_word

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

def sort_sentence(in_sentence):
    """Takes in a full sentence and returns the sorted words."""
    out_words = break_words(in_sentence)
    return sort_words(out_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(pf_sentence):
    """Sorts the words then prints the first and last one."""
    pf_words = sort_sentence(pf_sentence)
    print_first_word(pf_words)
    print_last_word(pf_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(d_started):
    d_jelly_beans = d_started * 500
    d_jars = d_jelly_beans / 1000
    d_crates = d_jars / 100
    return d_jelly_beans, d_jars, d_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 /= 10

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

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

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

print_first_word(words)
print_last_word(words)
print_first_word(sorted_words)
print_last_word(sorted_words)
sorted_words = sort_sentence(sentence)
print sorted_words

print_first_and_last(sentence)

print_first_and_last_sorted(sentence)