Fix NameError in python

I have created a program to take inputs from the user and find the average of those inputs. My code is –

def avg(*a):
    sum = 0
    n = 0
    while 1:
        a = input("enter number :")
        b = a.isdigit()
        if b is False:
            continue
        if int(a) == 0:
            break
        sum += int(a)
        n += 1
    return sum/n

avg()
print("AVG :",avg(a))

However, am getting this error –

Traceback (most recent call last):
  File "C:\Users\Metro\Desktop\python\script2.py", line 16, in <module>
    print("AVG :",avg(a))
                      ^
NameError: name 'a' is not defined

>Solution :

You got NameError because pass variable a to func avg and this variable not define in global scope and you dont need break and continue

def avg():
    total = 0
    count = 0
    while True:
        user_input = input("Enter number (for finish enter 0): ")
        if user_input.isdigit():
            num = int(user_input)
            if num == 0:
                return total / count if count != 0 else 0
            total += num
            count += 1

print("Average: ", avg())