源码
formatter = "%r %r %r %r"
print formatter % (1, 2, 3, 4) print formatter % ("one", "two", "three", "four") print formatter % (True, False, False, True) print formatter % (formatter, formatter, formatter, formatter) print formatter % ( "I had this thing.", "That you could type up right.", "But it didn't sing.", "So I said goodnight." )
输出结果
$ python ex8.py 1 2 3 4 'one' 'two' 'three' 'four' True False False True '%r %r %r %r' '%r %r %r %r' '%r %r %r %r' '%r %r %r %r' 'I had this thing.' 'That you could type up right.' "But it didn't sing." 'So I said goodnight.'
问题1：formatter起到的作用
问题2：为什么最后一行输出的有单引号和双引号
第三句But it didn't sing为双引号，其余为单引号，观察发现变量其中已经包含了单引号，所以用双引号来括住，后面我在第一句中加了一个单引号，输出结果确实被双引号括住了，证实了我的猜想。
这是只是声明了一个变量formatter，使用字符串“%r %r %r %r"为其赋值
这里使用的%r，之后打印时可以使用% （）的方式进行赋值，如果不进行赋值，直接打印则输出”%r %r %r %r“字符串
分别打印了整数型，字符串，布尔值，以及变量（打印变量的时候会直接输出变量的值）。
注：1.%（）里的值的个数必须和formatter中的%r的个数相同，按顺序对应
2.打印出的字符串默认用单引号括住，但如果字符串中本来就有单引号，那么会改用双引号括住。
ex9.py
源码
# Here's some new strange stuff,remember type it excatly.
days = "Mon Tue Wed Thu Fri Sat Sun"
months = "Jan\nFeb\nMar\nApr\nMay\nJun\nJul\nAug"
print "Here are the days:",days
print "Here are the months:",months
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
$ python ex9.py
Here are the days: Mon Tue Wed Thu Fri Sat Sun
Here are the months: Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
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.
1.字符串中的"\n"可以换行
2.print关键字后面的""" """ ，两个三连双引号之间可以输入任意多行字符串内容，将其按输入的原格式打印出来。
ex10.py
源码
