Solution Exercise 30: search common element in two lists with python

Exercise 30 

Write a function in Python that allows to compare two lists and to tell us if these two lists have a common value or not.

Solution

# define a function that compare two lists l1 and l2
def commonElements(l1,l2):
    counter = 0
    # try if there exists a common element and then increment the counter
    for x in l1:
        for y in l2:
            if(x == y):
                counter = counter + 1
    if counter >=1:
        return True
    else:
        return False
 
# Example       
l1 = [3, 9, 4, 7]
l2 = [1, 14, 3, 7, 5]
print(commonElements(l1,l2))