don't run

Question

def fun(s,*a):
for i in a:
s=i+s
return s
a1=[]
n=0
while 1:
a1.append(input('Please enter number:'))
n=n+1
if ''==a1[n-1]:
break
print( fun(0,*a1) )

Answer 1

Here's a working version. Feel free to ask if you don't understand any of the changes I made.

def fun(s, a):
for i in a:
s += i
return s
a1=[]
n=0
while 1:
x = input('Please enter number:')
if x != '':
a1.append(int(x))
else:
break
print(fun(0, a1))

Answer 2

I'm a beginner of pythen, thank you for your advice