类型错误:缺少一个必需的位置参数 [英] TypeError: Missing one required positional argument
问题描述
我正在开发一个游戏作为一个有趣的副项目,我遇到了这个错误,我真的不知道为什么会发生......
I am working on a game as a side project for fun and I have run into this error and I really don't know why it is happening...
代码如下:
class players:
def __init__(self, location, image_file, direction):
self.location = location
self.image_file = image_file
self.direction = direction
self.rect = self.image_file.get_rect()
def turn(self, direction, playerImages):
keys = pygame.key.get_pressed()
if keys[pygame.K_a] == True:
self.direction -= 1
if self.direction < -3:
self.direction = 3
if keys[pygame.K_d] == True:
self.direction = 1
if self.direction > 3:
self.direction = 3
if self.direction == -3:
self.image_file = playerImages[0]
if self.direction == -2:
self.image_file = playerImages[1]
if self.direction == -1:
self.image_file = playerImages[2]
if self.direction == 0:
self.image_file = playerImages[3]
if self.direction == 1:
self.image_file = playerImages[4]
if self.direction == 2:
self.image_file = playerImages[5]
if self.direction == 3:
self.image_file = playerImages[6]
return self.direction, self.image_file
我称之为:
skierDirection, playerImage = players.turn(skierDirection, playerImages)
我得到的错误是:
Traceback (most recent call last):
File "C:\Users\Owen\Desktop\coding compile file\SkiFreeX\SkiFreeX.py", line 129, in <module>
main()
File "C:\Users\Owen\Desktop\coding compile file\SkiFreeX\SkiFreeX.py", line 122, in main
skierDirection, playerImage = players.turn(skierDirection, playerImages)
TypeError: turn() missing 1 required positional argument: 'playerImages'
[Finished in 0.385s]
有什么想法吗?
推荐答案
您不应该直接调用类方法,而是创建该类的实例:
You are not supposed to call a class method directly, instead create an instance of that class:
p1 = players(your, values, here)
skierDirection, playerImage = p1.turn(skierDirection, playerImages)
详细说明您遇到的错误:
To elaborate on the error you're getting:
TypeError: turn() 缺少 1 个必需的位置参数:'playerImages'
TypeError: turn() missing 1 required positional argument: 'playerImages'
这是因为turn
需要一个players
的实例作为第一个参数(self
).类方法总是将实例作为第一个参数传递,因此 p1.turn(skierDirection, playerImages)
将实际传递 3 个参数给 players.turn
.
It's because turn
needs an instance of players
as first argument (self
). A class method always gets passed the instance as the first argument, thus p1.turn(skierDirection, playerImages)
will acutually pass 3 parameters to players.turn
.
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