为什么我会得到 TypeError:不能将序列乘以“float"类型的非整数? [英] Why do I get TypeError: can't multiply sequence by non-int of type 'float'?

问题描述

我正在输入以获取要乘以定义的销售税 (0.08) 的销售金额(按输入)，然后打印总金额(销售税乘以销售金额).

I am typing to get a sale amount (by input) to be multiplied by a defined sales tax (0.08) and then have it print the total amount (sales tax times sale amount).

我遇到了这个错误.任何人都知道可能有什么问题或有任何建议?

I run into this error. Anyone know what could be wrong or have any suggestions?

salesAmount = raw_input (["Insert sale amount here \n"])
['Insert sale amount here \n']20.99
>>> salesTax = 0.08
>>> totalAmount = salesAmount * salesTax

Traceback (most recent call last):
  File "<pyshell#57>", line 1, in <module>
    totalAmount = salesAmount * salesTax
TypeError: can't multiply sequence by non-int of type 'float'

推荐答案

raw_input 返回一个字符串(字符序列).在 Python 中，字符串和浮点数相乘没有定义的含义(而字符串和整数相乘的含义是:"AB" * 3 是 "ABABAB"；如何"L" * 3.14 多少?请不要回复"LLL|").您需要将字符串解析为数值.

raw_input returns a string (a sequence of characters). In Python, multiplying a string and a float makes no defined meaning (while multiplying a string and an integer has a meaning: "AB" * 3 is "ABABAB"; how much is "L" * 3.14 ? Please do not reply "LLL|"). You need to parse the string to a numerical value.

您可能想尝试:

salesAmount = float(raw_input("Insert sale amount here\n"))

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