你如何检查python一个字符串是否只包含数字？(How do you check in python whether a string contains only numbers?)

你如何检查python一个字符串是否只包含数字？(How do you check in python whether a string contains only numbers?)

如何检查一个字符串是否只包含数字？

我已经去了这里。 我想看到最简单的方式来完成这个。

import string def main(): isbn = input("Enter your 10 digit ISBN number: ") if len(isbn) == 10 and string.digits == True: print ("Works") else: print("Error, 10 digit number was not inputted and/or letters were inputted.") main() if __name__ == "__main__": main() input("Press enter to exit: ")

How do you check whether a string contains only numbers?

I've given it a go here. I'd like to see the simplest way to accomplish this.

import string def main(): isbn = input("Enter your 10 digit ISBN number: ") if len(isbn) == 10 and string.digits == True: print ("Works") else: print("Error, 10 digit number was not inputted and/or letters were inputted.") main() if __name__ == "__main__": main() input("Press enter to exit: ")

最满意答案

您将需要在str对象上使用isdigit方法：

if len(isbn) == 10 and isbn.isdigit():

从isdigit文档：

str.isdigit()

如果字符串中的所有字符都是数字，并且至少有一个字符，则返回true，否则返回false。

对于8位字符串，此方法与区域设置相关。

You'll want to use the isdigit method on your str object:

if len(isbn) == 10 and isbn.isdigit():

From the isdigit documentation:

str.isdigit()

Return true if all characters in the string are digits and there is at least one character, false otherwise.

For 8-bit strings, this method is locale-dependent.