ConvertToDecimal

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Fri Aug 23 08:09:18 2019

@author: aluno
"""
def converteDecimal(base, num):

    num = num[::-1]

    t=0 #por algum motivo estava considerando t = str
    for i in range(len(num)):
        if(base == 16):
             if num[i] in ['A','B','C','D','E','F']:
                if num[i] == 'A':
                    n = 10
                if num[i] == 'B':
                    n = 11
                if num[i] == 'C':
                    n = 12
                if num[i] == 'D':
                    n = 13
                if num[i] == 'E':
                    n = 14
                if num[i] == 'F':
                    n = 15
             else:
                n = int(num[i])

             t = int(n * (base**i)) + t
        else:
            n = int(num[i])
            t = int(n * (base**i)) + t

    print('O numéro ', num[::-1] ,' na base ', base ,' é igual à ', t ,' na base decimal.')

base = int(input('Digite a base: '))
num = input('Digite o numero: ')

converteDecimal(base, num)