t = """
'charmander',12

'bulbasaur',7

'squirtle',13"""

with open("data.txt","w") as f:
    f.write(t)

pokemons = []

with open("data.txt") as f:
    for line in f:
        line = line.strip() # remove n and other whitespaces
        if line:            # only process non empty lines
            try:
                poke, lvl = line.split(",")
            except ValueError:
                print("Unable to split line into 2 parts: ", line)
                continue
            poke=poke.strip("'")
            pokemons.append( [poke,int(lvl)] )

        if len(pokemons) ==  6:
            break

print(pokemons)

[['charmander', 12], ['bulbasaur', 7], ['squirtle', 13]]