Python用户只能输入浮点数 [英] Python user must only enter float numbers

问题描述

我正在尝试找出方法，以便用户[仅输入数字< 0]和[无字母].有人可以告诉我我该如何设置.我尝试设置try/catch块，但我不断收到错误消息.

I am trying to find out how to make it so the user [only enters numbers <0] and [no letters] allowed. Can someone show me how I would set this up. I have tried to set up try/catch blocks but I keep getting errors.

edgeone = input("Enter the first edge of the triangle: ")

推荐答案

您可以这样做.

i = 1
while(type(i)!=float):
    i=input("enter no.")
    try:
        int(i):
    except:
        try:
            i = float(i)
        except:
            pass
print(i)

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