This will clear 25  new lines:
def clear():
    print(' \n' * 25)
clear()
I use eclipse with pydev. I like the newline solution better than the for num in range . The for loop throws warnings, while the print newline doesn't.
If you want to specify the number of newlines in the clear statement try this variation.
def clear(j):
    print(' \n' * j)
clear(25)