python默认参数语法错误 [英] python default argument syntax error

问题描述

我刚刚在 python 中为使用 pygame 编写的游戏编写了一个小文本类，但由于某种原因，我的默认参数不起作用.我试着查看 python 文档，看看这是否能让我知道我做错了什么，但我没有完全理解文档中的语言.似乎没有其他人遇到此问题.

I just wrote a small text class in python for a game written using pygame and for some reason my default arguments aren't working. I tried looking at the python documentation to see if that might give me an idea what I did wrong, but I didn't fully get the language in the documentation. No one else seems to be having this issue.

这是文本类的代码:

class Text:
    def __init__(self,screen,x_location='center',y_location='center',writeable,color,size=12):
        self.font = pygame.font.Font("Milleni Gem.ttf", size)

        self.text = self.font.render(writeable,True,color)
        self.textRect = self.text.get_rect()

        if x_location == "center":
            self.textRect.centerx = screen.get_rect().centerx
        else:
            self.textRect.x = x_location

        if y_location == "center":
            self.textRect.centery = screen.get_rect().centery
        else:
            self.textRect.y = y_location
        self.update()

    def update(self):
        screen.blit(self.text,self.textRect)

这是调用它的代码:

from gui import *
Text(screen,75,75,currentweapon.clip)#currentweapon.clip is an integer

我得到的错误是这样的:

The error I get is this:

SyntaxError: non-default argument follows default argument

并指向代码中的 def __init__() 行.这个错误是什么意思，我在这里做错了什么?

and points to the def __init__() line in the code. What does this error mean and what am I doing wrong here?

推荐答案

def __init__(self,screen,x_location='center',y_location='center',writeable,color,size=12):

您在默认参数之后定义了非默认参数，这是不允许的.你应该使用:

You have defined non-default arguments after default arguments, this is not allowed. You should use:

def __init__(self,screen,writeable,color,x_location='center',y_location='center',size=12):

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