需要浮动??Python 中的 round() 错误 [英] float required?? Error with round() in Python

问题描述

无法通过搜索找到此问题的答案.我正在尝试学习一些 Python 并且需要你的帮助来实现这个功能:

could not find this question answered by search. I am trying to learn some Python and need your help this this function:

def roundtest():
    i = round(raw_input("call a number: "), 2)
    print i

我的输入 &我得到的错误:

My input & the error I get:

call a number: 1.2222

TypeError: a float is required

感谢您的帮助

推荐答案

raw_input 返回一个字符串，然后您必须将其解析为 float，如下所示:

raw_input returns a string, which you then have to parse in to a float, like so:

def roundtest():
    i = round(float(raw_input("call a number: ")), 2)
    print i

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