Question

def randomly_pokemon_select_function():
    from random import randint
    import linecache

open_pokedex=open("pokedex.txt","r")

p1_p1=list()
p1_p2=list()
p1_p3=list()
p2_p1=list()
p2_p2=list()
p2_p3=list()
player1_pokemons=list()
player2_pokemons=list()
pokemon_selection=(randint(1,40))
p1_p1.append(linecache.getline("pokedex.txt", pokemon_selection).split())
pokemon_selection=(randint(1,40))
p1_p2.append(linecache.getline("pokedex.txt", pokemon_selection).split())
pokemon_selection=(randint(1,40))
p1_p3.append(linecache.getline("pokedex.txt", pokemon_selection).split())
pokemon_selection=(randint(1,40))
p2_p1.append(linecache.getline("pokedex.txt", pokemon_selection).split())
pokemon_selection=(randint(1,40))
p2_p2.append(linecache.getline("pokedex.txt", pokemon_selection).split())
pokemon_selection=(randint(1,40))
p2_p3.append(linecache.getline("pokedex.txt", pokemon_selection).split())
player1_pokemons.append(p1_p1+p1_p2+p1_p3)
player2_pokemons.append(p2_p1+p2_p2+p2_p3)
open_pokedex.close()
print player1_pokemons
print player2_pokemons
return player1_pokemons,player2_pokemons

此代码工作正常但似乎它会生成一个额外的列表。输出看起来像这样：

[ [ ['Geodude'，'40'，'80'，'Rock'，'Fighting']，
['Raichu'，'60'，'90'，'电'，'正常']，
['Golem'，'80'，'120'，'Rock'，'Fighting'] ] ]

强括号是额外的，我无法找到哪一行产生额外的列表。

Answer 1

您为这些列表构建了3个列表，p1_p1, p1_p2 and p1_p3 ; each is a list containing another list, because you append the result of str.split（）`。

每个人都是这样的：

[[datum, datum, datum, datum, datum]]

然后，您使用+并将追加这些列表连接到player1_pokemons，这已经是列表对象。而不是追加，只是将你的列表：

player1_pokemons = p1_p1 + p1_p2 + p1_p3

或者不是附加到单独的p1_p1，p1_p2等列表，而是直接附加到player1_pokemons。您可以循环执行此操作：

player1_pokemons = [
    linecache.getline("pokedex.txt", randint(1, 40)).split()
    for _ in range(3)]
player2_pokemons = [
    linecache.getline("pokedex.txt", randint(1, 40)).split()
    for _ in range(3)]

请注意，linecache模块已经打开并为您读取文件，您不需要自己打开文件。

Answer 2

在追加方法中添加列表时，您正在创建列表列表，然后将其附加到列表中。

Python列表函数生成1个额外列表

2 个答案: