def find_gcd(x, y): 
      
    while(y): 
        x, y = y, x % y 
      
    return x 
          
   
l = [2, 4, 6, 8, 16] 
  
num1 = l[0] 
num2 = l[1] 
gcd = find_gcd(num1, num2) 
  
for i in range(2, len(l)): 
    gcd = find_gcd(gcd, l[i]) 
      
print(gcd) 

Create GCD.py