print function was not work without parenthesis in python3

[cherukurir]

print ("Starting gradient descent at b = {0}, m = {1}, error = {2}".format(initial_b, initial_m, compute_error_for_line_given_points(initial_b, initial_m, points)))

print ("Running...")

print ("After {0} iterations b = {1}, m = {2}, error = {3}".format(num_iterations, b, m, compute_error_for_line_given_points(b, m, points)))

[CDHales]

It's a difference between Python 2 and Python 3. In Python 3 print is a function. With Python 2 that code would work fine. I'm not sure why he states that this code should work with both versions.