习题23：读代码
话一周的时间阅读代码，这。。。其实每天都有在读各种深度网络只不过看不懂（汗颜）
几个网站
习题24：更多练习
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 explanation
\n\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 crates." % secret_formula(start_point))
习题25：更多更多的练习
主要是关于函数和变量
def break_words(stuff):
"""This function will break up words for us."""
words = stuff.split(' ') # 通过指定分隔符对字符串进行分割并返回一个列表
return words
def sort_words(words):
"""Sorts the words."""
return sorted(words) # 把参数words中的内容按照升序排列，并生成一个新的列表,返回结果
def print_first_word(words):
word = words.pop(0) # 拿出words列表中的第一个元素,并返回该元素的值
print(word)
def print_last_word(words):
word = words.pop(-1) # 拿出words列表中的最后一个元素,并返回该元素的值
print(word)
def sort_sentence(sentence):
words = break_words(sentence)
return sort_words(words)
def print_first_and_last(sentence):
words = break_words(sentence)
print_first_word(words)
print_last_word(words)
def print_first_and_last_sorted(sentence):
words = sort_sentence(sentence)
print_first_word(words)
print_last_word(words)正常运行的时候，不报错，但没有显示
1. 研究答案中没有分析过的行，找出它们的来龙去脉。确认自己明白了自己使用的是模组 ex25 中定义的函数。
2. 试着执行 help(ex25) 和 help(ex25.break_words) 。这是你得到模组帮助文档的方式。 所谓帮助文档就是你定义函数时放在 """ 之间的东西，它们也被称作 documentation comments （文档注解），后面你还会看到更多类似的东西。
3. 重复键入 ex25. 是很烦的一件事情。有一个捷径就是用 from ex25 import * 的方式导入模组。这相当于说：“我要把 ex25 中所有的东西 import 进来。”程序员喜欢说这样的倒装句，开一个新的会话，看看你所有的函数是不是已经在那里了。
from bffLearnPython import *
sentence = "All good things come to those who wait."
words = break_words(sentence) # 对句子划分
print(words) # 输出划分后的单词
sorted_words = sort_words(words) # 对单词进行排序
print(sorted_words) # 输出
print_first_word(words) # 输出word排序中的第一个单词
print_last_word(words) # 输出word排序中的最后一个单词
print(words) # 输出此时的单词
print_first_word(sorted_words) # 输出sort_words排序中的第一个单词
print_last_word(sorted_words) # 输出sort_words排序中的最后一个单词
print(sorted_words) # 输出此时排序完成的单词
sorted_words = sort_sentence(sentence) # 直接对句子进行排序
print(sorted_words) # 输出排序后的单词
print_first_and_last(sentence) # 输出原句子的第一个和最后一个
print_first_and_last_sorted(sentence) # 输出经过排序后句子的第一个和最后一个可以对比一下在终端下的结果是一样的
4. 把你脚本里的内容逐行通过 python 编译器执行，看看会是什么样子。你可以执行CTRL-D (Windows 下是 CTRL-Z)来关闭编译器。
习题26：恭喜你，现在可以考试了！
修正别人的代码，试一下吧。
代码基本是前面练习的集合，复习一下。
源代码地址：https://learnpythonthehardway.org/exercise26.txt
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 \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_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)
结束这个我也算是完成一半了！加油！