My function only returns None

Question

I was creating/trying to create a python chat bot, so far so good. But when I use my function that returns the robot’s answer it returns None! I don’t know how to fix...

def responder(conversa1, posicao): #conversa1 significa o que o usuário digitou. A posição esta definida como 1 por padrão 
   a = open('conversas.txt', 'r')
   for linha in a.readlines():
      if conversa1 == linha:
        resultado = linha
        res = resultado.split('= ')[posicao].strip('\n')
        return res

Important to say that the answers are saved in a txt file

oi=  oi tudo bem?
ola= ola para voce tambem
tudo bem?= tudo bem sim, e voce?
tudo= que legal

NOTE: no if I tried to replace "==" with "in" but when I do this it shows the wrong robot’s answer, I don’t know why.

Answer 1

The indentation of your code is wrong. The IF It should be inside your go. The None was being returned because the IF had never been executed. In case the IN would only work if your line was of the type LISTA, what is not, if you are comparing two strings the correct is to use ==.

def responder(conversa1, posicao):
   a = open('conversas.txt', 'r')
   for linha in a.readlines():
       if conversa1 == linha:
         resultado = linha
         res = resultado.split('= ')[posicao].strip('\n')
         return res
    return 'conversa1 nao eh igual a linha'

Answer 2

Here’s the solution and with context manager. The problem was in this if if conversa1 == line.strip(' n'):

def responder(conversa1, posicao):
   with open('conversas.txt', 'r') as a:    
     for linha in a.readlines():
         if conversa1 == linha.strip('\n'):
           resultado = linha
           res = resultado.split('= ')[posicao].strip('\n')
           return res
   return 'conversa1 nao eh igual a linha'