题目
据说我们的练习至此恰好是过半的位置，所以 Zed 大人给我们安排了期中考试，要求是修改其中的各种错误。题目来自 24、25 题的脚本，而这其中特意调整了顺序并增加了不少错误，这里也有很多程序员常犯的错误（例如拼写错误），所以也是一个负面教材的学习了。
Zed 给了我们两个建议：
1. 不要寻求帮助，即使花费了大量时间也要自己独立完成。
2. 不要钻牛角尖，想不出的时候试着休息一下。
题目脚本下载：http://learnpythonthehardway.org/exercise26.txt
我的答案
之前使用的 vscode 有一些代码错误提示的功能，所以这次我改用了 notepad++ 并只使用代码高亮的功能来完成练习。修改后的代码如下，不得不说，还是有地方没改到报错了…
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.pop(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 \nnewlines 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
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 beans, %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))
sentence = "All good things come to those who wait."
import ex25
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_words)
print_first_and_last(sentence)
print_first_and_last_sorted(sentence)
