Fibonacci Series Using Recursion In Python

##PYTHON PROGRAM TO FIND FIBONACCI SERIES USING RECURRSION

global sum;
sum=0
first=0;
second=1;
print(first);
print(second);
def fab(first,second):
    global sum
    if(sum>100):
        exit();
    sum=first+second;
    print(sum);
    fab(second,sum);

fab(first,second);