python系统学习日记 L26 修正改错

书中L26是改错习题，对一段有问题的代码进行改正
书中代码：

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.poop(0)print worddef print_last_word(words):"""Prints the last word after popping it off."""word = words.pop(-1print worddef 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" % fivedef secret_formula(started):jelly_beans = started * 500jars = jelly_beans \ 1000crates = jars / 100return jelly_beans, jars, cratesstart_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 / 10print "We can also do that this way:"
print "We'd have %d beans, %d jars, and %d crabapples." % secret_formula(start_pontsentence = "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_wordsprint_irst_and_last(sentence)print_first_a_last_sorted(senence)

修改后的代码：

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): #此处少了个冒号"""Prints the first word after popping it off."""word = words.pop(0) #此处pop拼写错误print(word)def print_last_word(words):"""Prints the last word after popping it off."""word = words.pop(-1)  #此处缺少括号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 #计算公式错误
print("This should be five: %s" % five)def secret_formula(started):jelly_beans = started * 500jars = jelly_beans / 1000 #计算符号错误crates = jars / 100return jelly_beans, jars, cratesstart_point = 10000
beans,jars, crates = secret_formula(start_point) # = 号写成 == start_point拼写成start-pointprint("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 / 10print("We can also do that this way:") #拼写错误少了括号
print("We'd have %d beans, %d jars, and %d crabapples." % secret_formula(start_point))sentence = "All god\tthings come to those who weight."#ex25. 前缀多余
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) #拼写错误print_first_and_last(sentence) #拼写错误print_first_and_last_sorted(sentence) #拼写错误

输出结果：

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