我想知道这个python应该怎么写

def f(a,n):
i = 0
l = 0
s = 0
while i <= (n-1) :
m = a*(10**i)
l += m
s +=l
#print(m,l,s)
i += 1
print(s)

a = int(input('a='))
n = int(input('n='))

f(a,n)