对浮点数使用isdigit吗?

本文介绍了对浮点数使用isdigit吗?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 a = raw_input('How much is 1 share in that company? ') while not a.isdigit(): print("You need to write a number!\n") a = raw_input('How much is 1 share in that company? ')

这仅在用户输入integer时有效，但是即使他们输入float，我希望它也能正常工作，但在输入string时无效.

This only works if the user enters an integer, but I want it to work even if they enter a float, but not when they enter a string.

因此，用户应该能够输入9和9.2，但不能输入abc.

So the user should be able to enter both 9 and 9.2, but not abc.

我应该怎么做?

推荐答案

使用正则表达式.

import re p = repile('\d+(\.\d+)?') a = raw_input('How much is 1 share in that company? ') while p.match(a) == None: print "You need to write a number!\n" a = raw_input('How much is 1 share in that company? ')