my merge sort 2

from random import randint

list_to_sort = [randint(1,100) for i in range(50)]
print(list_to_sort)
def merge(list_a, list_b):
    list_c = []
    while len(list_a) > 0  and len(list_b) > 0:
        if list_a[0] < list_b[0]:
            list_c.append(list_a.pop(0))
        else:
            list_c.append(list_b.pop(0))
    if list_a == []:
        list_c += list_b
    else:
        list_c += list_a
    print("merged list is", list_c)
    return list_c


def merge_sort(unsorted):
    if len(unsorted) <=1:
        return unsorted
    front =[]
    back =[]

    for i,x in enumerate(unsorted,start=0):

        if i < len(unsorted)/2:
            front.append(x)
        else:
            back.append(x)

    print("splits are", front, back)
    front = merge_sort(front)
    back = merge_sort(back)
    return merge(front, back)

merge_sort(list_to_sort)