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复习Python的第二十四天

习题 26: 恭喜你，现在可以考试了

作者的话：

当你成为程序员以后，你将需要经常面对别的程序员的代码，也许还有他们的傲慢态度，他们会经常说自己的代码是完美的。

这样的程序员是自以为是不在乎别人的蠢货。优秀的科学家会对他们自己的工作持怀疑态度，同样，优秀的程序员也会认为自己的代码总有出错的可能，他们会先假设是自己的代码有问题，然后用排除法清查所有可能是自己有问题的地方， 最后才会得出“这是别人的错误”这样的结论。

而本节的习题就是修改现有的代码。

• 随机删掉的一些字符，以及添加的一些错误；有
• 大部分的错误可以通过Python执行告知； 最可行
• 还有一些算术错误要自己找出来； 已找出
• 再剩下来的就是格式和拼写错误。 有

接下来的是本节的代码：

def break_words(stuff):    """This function will break up words for us."""    words = stuff.split(' ')    return wordsdef sort_words(words):    """Sorts the words."""    return sorted(words)def print_first_word(words):    """Prints the first word after popping it off."""    word = words.pop(0)    print worddef 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 worldwith logic so firmly plantedcannot discern \n the needs of lovenor comprehend passion from intuitionand requires an explantion\n\t\twhere there is none."""print "--------------"print poemprint "--------------"##### five = 10 - 2 + 3 - 5 # 6print "This should be five: %d" % five#####def secret_formula(started):    jelly_beans = started * 500    jars = jelly_beans / 1000    crates = jars / 100    return jelly_beans, jars, cratesstart_point = 10000beans, jars, crates = secret_formula(start_point)print "With a starting point of: %d" % start_pointprint "We'd have %d jeans, %d jars, and %d crates." % (beans, jars, crates)##### start_point = start_point / 10print "We can also do that this way:"print "We'd have %d beans, %d jars, and %d crabapples." % secret_formula(start_point)##### import ex25sentence = "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)print sorted_wordsprint_first_and_last(sentence)print_first_and_last_sorted(sentence)

比起手动找错误，我更想学pdb自动测试啊，还有调试代码的技巧。

本节的测试很简单，细心点就可以了，本来我以为自己看一遍就差不多了，没想到还是漏了几个错误（汗颜）。

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