关于python中的字符串格式，'[%s]'是什么意思？

Question

看到一行代码：

re.compile('[%s]' % re.escape(string.punctuation))

但是我不知道[%s]的作用

谁能帮帮我？

谢谢！

Answer 1

它是一种字符串格式化语法（它是从 C 中借用的）。

例子：

name = input("What is your name? ")
print("Hello %s, nice to meet you!" % name)

这就是程序的样子：

What is your name? Johnny
Hello Johnny, nice to meet you!

您也可以通过字符串浓度来做到这一点...

name = input("What is your name? ")
print("Hello + name + ", nice to meet you!")

...但是，格式化通常更容易。 您也可以将它与 多个 字符串一起使用。

name = input("What is your name? ")
age = input("How old are you? ")
gender = ("Are you a male or a female? ")
print("Is this correct?")
print("Your name is %s, you are %s years old, and you are %s." % name, age, gender)

输出：

What is your name? Johnny
How old are you? 37
Are you a male or a female? male
Is this correct?
Your name is Johnny, you are 37 years old, and you are male.

现在，在问任何更多问题之前，请看看它们是否存在！