Python 如何根据用户提出的问题使用变量计算公式

我在第5行得到错误“TypeError:can not multiply sequence by non int of type‘str’”，即“number=str（c（c*r）**x）”。如果有任何帮助，我都会感激的。我是个新手

import math
c = raw_input("what is the intial number?")
r = raw_input("What is the rate of growth?")
x = raw_input("How many years are taking place?")
int(c)
int(r)
int(x)
number = str(c(c*r)**x)
print (number)

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您忘记重新分配变量：

import math
c = raw_input("what is the intial number?")
r = raw_input("What is the rate of growth?")
x = raw_input("How many years are taking place?")
c = int(c)
r = int(r)
x = int(x)
number = str(c*(c*r)**x)
print (number)

int（）

返回解析后的整数。您还需要为正在执行的每个乘法运算输入

*

print

默认情况下可以打印整数，无需在

number

import math
c = raw_input("what is the intial number?")
r = raw_input("What is the rate of growth?")
x = raw_input("How many years are taking place?")
c = int(c)
r = int(r)
x = int(x)
number = (c * (c * r))  ** x
print(number)

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更好的方法只是在同一个语句中，像这样（用户友好的方式）

输出

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c、 r，x是转换它的字符串，你必须执行

c=int（c）

你错过了

c（c*r）

位<代码>c不是可调用的好吧，祝你好运。

import math

c = int(raw_input("what is the intial number?\n=> "))
r = int(raw_input("What is the rate of growth?\n=> "))
x = int(raw_input("How many years are taking place?\n=> "))

number = str(c*(c*r)**x)
print(number)

what is the intial number?
=> 3
What is the rate of growth?
=> 4
How many years are taking place?
=> 5
746496