Python 类型错误：缺少一个必需的位置参数
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TypeError: Missing one required positional argument
提问by Owen Martin
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...
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这种情况......
Here is the code:
这是代码：
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
I call it like:
我称之为：
skierDirection, playerImage = players.turn(skierDirection, playerImages)
The error I get is:
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]
Any ideas?
有任何想法吗？
采纳答案by Mike Scotty
You are not supposed to call a class method directly, instead create an instance of that class:
您不应该直接调用类方法，而是创建该类的实例：
p1 = players(your, values, here)
skierDirection, playerImage = p1.turn(skierDirection, playerImages)
To elaborate on the error you're getting:
要详细说明您遇到的错误：
TypeError: turn() missing 1 required positional argument: 'playerImages'
类型错误：turn() 缺少 1 个必需的位置参数：'playerImages'
It's because turnneeds an instance of playersas 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.
这是因为turn需要一个players作为第一个参数 ( self)的实例。类方法总是将实例作为第一个参数p1.turn(skierDirection, playerImages)传递，因此实际上将 3 个参数传递给players.turn.
回答by sandeep shewale
You have need to use () with class name
您需要将 () 与类名一起使用
Follow below code
按照下面的代码
skierDirection, playerImage = players().turn(skierDirection, playerImages)
