书本练习题6print函数使用

字符是指你想要展示给别人的、或者是你想要从程序里“导出”的一小段字符。Python 可以通过

文本里的双引号 " 或者单引号 ' 识别出字符串来。

如果你把单引号或者双引号括起来的文本放到 print 后面，它们就会被 python 打印出来。

字符串可以包含格式化字符 %s，这个你之前也见过的。你只要将格式化的变量放到字符串中，再紧跟着

一个百分号 % (percent)，再紧跟着变量名即可。唯一要注意的地方，是如果你想要在字符串中通过格式

化字符放入多个变量的时候，你需要将变量放到 ( ) 圆括号中，而且变量之间用 , 逗号

隔开。

x = "There are %d types of people." % 10
binary = "binary"
do_not = "don't "
y = "Those who know %s and those who %s." %(binary,do_not)

print(x)
print(y)

print("I said : %r." % x)
print("I said : '%s'." % y)

hilarious = False
joke_evaluation = "Isn't that joke so funny?! %r"

print(joke_evaluation % hilarious)

w = "This is the lefe side of ..."

e = "a string with a right side."

print(w + e)

输出结果：

There are 10 types of people.
Those who know binary and those who don't .
I said : 'There are 10 types of people.'.
I said : 'Those who know binary and those who don't .'.
Isn't that joke so funny?! False
This is the lefe side of ...a string with a right side.