blocks|key|1192302|text|Methods+are+passed+the+instance+as+the+first+argument.|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1192303|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.python.org/tutorial/classes.html^0|0|1I|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

<a href="http://docs.python.org/tutorial/classes.html" rel="nofollow">Methods are passed the instance as the first argument.</a>

blocks|key|5230993|text|在Python中，调用方法的对象总是显式地作为参数传入。这个参数通常被称为self。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5230994|将readSaved()定义为实例方法的正确定义应将以下内容作为第一行：|5230995|def+readSaved(self):
++++#+...|code-block|syntax|javascript|5230996|如果您希望它是模块级函数，则应按如下方式调用它：|5230997|s+=+readSaved()|5230998|entityMap^0|11|4|0|1|B|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|Z|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|R|$]]

In Python, the object on which a method is called is always passed in explicitly as an argument. This argument is conventionally called <code>self</code>.

The correct definition for <code>readSaved()</code> as an instance method should have this as the first line:

<pre><code>def readSaved(self):
 # ...
</code></pre>

If you want it to be a module-level function, you should call it as follows:

<pre><code>s = readSaved()
</code></pre>

blocks|key|827542|text|因为它是一个方法--不管怎么说，你都是把它作为一个方法来调用的--你必须至少有一个self作为参数。当函数作为方法调用时，调用该方法所通过的对象将作为第一个参数传递给该函数。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|827543|entityMap^0|15|4|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

As it is a method -- you're calling it as a method, anyway -- you have to have at least <code>self</code> as an argument. When a function is called as a method, the object you call the method through is passed as the first argument to that function.

blocks|key|1843886|text|它是在类中定义的吗？我想是这样的，因为第二个方法使用self。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1843887|如果readSaved是一个实例方法，它也将self作为第一个参数。如果您不需要它，请使用@staticmethod装饰器：|1843888|@staticmethod
def+readSaved():
++f+=+codecs.open((os.getenv('HOME')+%2B'/Dokument/savefile.txt')+,'r','utf-8')
++l+=+f.readlines()
++f.close()
++return+l|code-block|syntax|javascript|1843889|entityMap^0|Q|4|0|2|9|M|4|19|D|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|N|$]]

Is it defined within a class? I suppose it does, since the second method takes <code>self</code>.

If <code>readSaved</code> is an instance method, it takes <code>self</code> as first parameter as well. If you don't need it, use the <code>@staticmethod</code> decorator instead:

<pre><code>@staticmethod
def readSaved():
 f = codecs.open((os.getenv('HOME') +'/Dokument/savefile.txt') ,'r','utf-8')
 l = f.readlines()
 f.close()
 return l
</code></pre>

I got the following python code where <code>printSaved</code> is called when a button is clicked (using the wx library and python 2.7.2). But when this happens i got a really strange error

<pre><code>Traceback (most recent call last):
 File "./program.py", line 135, in printSaved
 s = self.readSaved()
TypeError: readSaved() takes no arguments (1 given)
</code></pre>

Here is the code

<pre><code> def readSaved():
 f = codecs.open((os.getenv('HOME') +'/Dokument/savefile.txt') ,'r','utf-8')
 l = f.readlines()
 f.close()
 return l

 def printSaved(self,event):
 s = self.readSaved()
 for l in s:
 print l
</code></pre>

I fixed the problem by adding one argument to <code>readSaved(somethingUseless)</code> and everything worked fine. My question is what is passed to readSaved and HOW/WHY? Does this have something to do with the event?

Strange extra argument

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我获得了以下python代码，其中在单击按钮时调用printSaved (使用wx库和Python2.7.2)。但是当这种情况发生时，我得到了一个非常奇怪的错误Traceback (most recent call last):  File "./program.py", line 135, in printSaved...

问奇怪的额外参数
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问奇怪的额外参数EN