6.
单引号、双引号括起来的东西为字符串
%r多功能占位符会在替代它的字符串前后加上单引号
第一次见的写法：
x="There are %d types of people."%10
print("I said:%s"%x)
hilarious=False
joke_evaluation="Isn't that joke so funny?! %r"
print(joke_evaluation%hilarious)
7.
print("."*10)
输出结果为：..........
8.
formatter="%r %r %r %r"
print(formatter%(1,2,3,4))
答案：因为第三个字符串里有单引号
9.
print(""" """)之间的文字将被原样保留(转移字符除外)，并在结尾自动换行
print("""There's something going on here.
With the three double-quotes.
We'll be able to type as much as we like.
Even 4 lines if we want,or 5,or 6.""")
输出结果：
There's something going on here.
With the three double-quotes.
We'll be able to type as much as we like.
Even 4 lines if we want,or 5,or 6.
10.
fat_cat="""I'll do a list:\
*Cat food
*Fishies
*Catnip
*Grass"""
print(fat_cat)
输出结果：
I'll do a list:
*Cat food
*Fishies
*Catnip
*Grass