TypeError：无法将序列乘以float类型的非整数

Question

I tried to put the float and int inside my coding, but it still said "can't multiply sequence by non-int of type float "

PV = input("investment amout:")
r = float(input("rate:"))
n = int(input("year:"))
FV_conti = PV*(1+r)**n
import math
FV_diceret = PV * math.exp(r*n)

Answer 1

The issue is that PV is a string and not a float. input() is Python3 does not evaluate the input unlike in Python2 .

You need to convert it into a int / float :

PV = int(input("investment amout:"))

If you multiply a string with an int, it performs concatenation. That is why multiplying by float does not make sense.

>>> PV = "123"
>>> PV*2
'123123'
>>> PV*2.3
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: can't multiply sequence by non-int of type 'float'