#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
Napisz funkcję leet_speak, która podmienia w podanym napisie niektóre litery
na podobnie wyglądające cyfry: 'e' na '3', 'l' na '1', 'o' na '0', 't' na '7'.
Np. leet('leet') powinno zwrócić '1337'.
"""


def leet_speak(text):
    text_tmp = text
    lista_temp = ""
    for i in text_tmp:
        if i =='e':
            lista_temp += '3'
        elif i =='l':
            lista_temp += '1'
        elif i =='o':
            lista_temp += '0'
        elif i =='t':
            lista_temp +='7'
        else:
            lista_temp +=i
    return lista_temp

def tests(f):
    inputs = [['leet'], ['do not want']]
    outputs = ['1337', 'd0 n07 wan7']

    for input, output in zip(inputs, outputs):
        if f(*input) != output:
            return "ERROR: {}!={}".format(f(*input), output)
            break
    return "TESTS PASSED"

if __name__ == "__main__":
    print(tests(leet_speak))