解决python的OverflowError: int too large to convert to float解决python的OverflowError: int too large to convert to float

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解决python的OverflowError: int too large to convert to float

测试样例为：1000
错误代码：

def  main(): 
        num  =  eval(input()) 
        calculate_e(num) 
def calculate_e(n):
    t=1
    s=1
    for i in range(1,n+1):
        t=t*i
        s=s+1.0/t
    print('%.6f'%(s))
main()

上述代码会出现报错：OverflowError: int too large to convert to float
应该改成如下，才正确：

def  main(): 
        num  =  eval(input()) 
        calculate_e(num) 
def calculate_e(n):
    t=1
    s=1
    for i in range(1,n+1):
        t=t*i
        s=s+1/t
    print('%.6f'%(s))
main()