浮点输入无法识别及Python中current_location变量不更新问题求助

核心问题是你没有将move_player函数返回的新位置赋值回current_location变量。

具体原因 #

Python中字符串属于不可变类型，当你把current_location传入函数作为location参数时，传递的是变量的值副本。函数内部计算出的new_location只是局部变量，不会自动同步到外部的current_location。必须显式接收函数的返回值，才能更新原变量。

修正方法 #

把原来的函数调用语句：

move_player(current_location, player_input)

改成：

current_location = move_player(current_location, player_input)

完整修正后的代码 #

areas = {
    'geysers':{'north':'caves', 'south':'fields', 'east':'swamps', 'west':'treetops', 'item':'start'},
    'caves':{'south':'geysers', 'east':'cliffs', 'item':'sword'},
    'fields':{'north':'geysers', 'east':'temple', 'item':'bandages'},
    'swamps':{'north':'pond', 'west':'geysers', 'item':'tranquilizer'},
    'treetops':{'east':'geysers', 'item':'blowtorch'},
    'cliffs':{'west':'caves', 'item':'shield'},
    'pond':{'south':'swamps', 'item':'javelin'},
    'temple':{'west':'fields', 'item':'villain'}
}
current_location = 'geysers'

def invalid_move():
    print('Move not valid. Try again.')

player_input = input('Enter your move:\n>').lower().split()

def move_player(location, player_move):
    new_location = location
    if player_move[0] == 'go':
        if player_move[1] in areas[location] and player_move[1] != 'item':
            new_location = areas[location][player_move[1]]
        else:
            invalid_move()
    else:
        invalid_move()
    return new_location

# 关键修正：将返回值赋值给current_location
current_location = move_player(current_location, player_input)
print(current_location)

内容的提问来源于stack exchange，提问作者Gil Savage