def main():
    fh = choise_file()
    if len(fh) == 0:
        print("No items are in the list")
    else:
        for lino, line in enumerate(fh, start=1):
            print("{1}. {2}".format(lino, line))
    choise_func()
    return

def choise_file():
    fh = None
    lists_all = []
    lists_lst = []
    lists_all = os.listdir(".")
    for list in lists_all:
        if list.endswith((".lst")):
            lists_lst.append(list)
    if len(lists_lst) == 0:
        list = input("Enter name file:")
        list += ".lst"
        lists_lst.append(list)
        fh = open(list, "w", encoding="utf8")
    else:
        for lino, list in enumerate(lists_lst, start=1):
            print("{1}: {2} file".format(lino, list))
        num_file = input("Enter number file: ")
        fh = open(lists_lst[num_file-1], "w", encoding="utf8")
    return fh

main()

>>> print("{0}: {1} file".format('omg', 'wtf'))
omg: wtf file
>>> print("{1}: {2} file".format('omg', 'wtf'))

Traceback (most recent call last):
  File "<pyshell#4>", line 1, in <module>
    print("{1}: {2} file".format('omg', 'wtf'))
IndexError: tuple index out of range