def tryway():
    alist = list(range(1000))
    try:
        while True:
            alist.pop()
    except IndexError:
        pass

def ifway():
    alist = list(range(1000))
    while True:
        if alist == []:
            break
        else:
            alist.pop()
if __name__=='__main__':
    from timeit import Timer
    print("Testing Try")
    tr = Timer("tryway()","from __main__ import tryway")
    print(tr.timeit(10000))
    print("Testing If")
    ir = Timer("ifway()","from __main__ import ifway")
    print(ir.timeit(10000))