不能将序列乘以'float'类型的非int

Question

级别:初学者

为什么我得到错误"不能将序列乘以'int'类型的非int"？

def nestEgVariable(salary, save, growthRates):
    SavingsRecord = []
    fund = 0
    depositPerYear = salary * save * 0.01
    for i in growthRates:  
        fund = fund * (1 + 0.01 * growthRates) + depositPerYear
        SavingsRecord += [fund,]
    return SavingsRecord 


print nestEgVariable(10000,10,[3,4,5,0,3])

谢谢巴巴

Answer 1

for i in growthRates:  
    fund = fund * (1 + 0.01 * growthRates) + depositPerYear

应该:

for i in growthRates:  
    fund = fund * (1 + 0.01 * i) + depositPerYear

您将使用growthRates列表对象乘以0.01.将列表乘以整数是有效的(它是重载的语法糖,允许您创建包含其元素引用副本的扩展列表).

例:

>>> 2 * [1,2]
[1, 2, 1, 2]

Answer 2

Python允许您将序列相乘以重复其值.这是一个视觉示例:

>>> [1] * 5
[1, 1, 1, 1, 1]

但它不允许您使用浮点数来执行此操作:

>>> [1] * 5.1
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: can't multiply sequence by non-int of type 'float'