blocks|key|1945834|text|将您的功能定义为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1945835|def+getUsername(self):

def+getAddress(self):|code-block|syntax|javascript|1945836|您的代码中缺少self。|1945837|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Define your function as bellow.

<pre><code>def getUsername(self):

def getAddress(self):
</code></pre>

self is missing in your code.

blocks|key|1945882|text|Python隐式地将对象传递给方法调用，但是您需要显式地声明它的参数。这通常被命名为self：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1945883|def+getUserName(self)
def+getAdress(self)|code-block|syntax|javascript|1945884|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Python implicitly passes the object to method calls, but you need to explicitly declare the parameter for it. This is customarily named self:

<pre><code>def getUserName(self)
def getAdress(self)
</code></pre>

blocks|key|903597|text|试试这个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|903598|class+Reader():
def+getUsername(self):
++++username+=+"name"
++++return+username

def+getAddress(self):
++++address+=+'address'
++++return+address


class+DisplayInfo():
++++reader+=+Reader()
++++uName+=+reader.getUsername()
++++addr+=+reader.getAddress()

reader+=+Reader()
uName+=+reader.getUsername()
uAddress+=+reader.getAddress()|code-block|syntax|javascript|903599|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try to this.

<pre><code>class Reader():
def getUsername(self):
 username = "name"
 return username

def getAddress(self):
 address = 'address'
 return address


class DisplayInfo():
 reader = Reader()
 uName = reader.getUsername()
 addr = reader.getAddress()

reader = Reader()
uName = reader.getUsername()
uAddress = reader.getAddress()
</code></pre>

blocks|key|1945941|text|Python总是隐式地将对象传递给函数，这就是获得错误的原因。通过将其更改为|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1945942|getUsername(self):
...
return+username|code-block|syntax|javascript|1945943|类就是为此而使用的，因此您可以将函数和变量封装到仅对自身可用的对象中。为了让一个完全不同的对象能够访问其他事物所固有的东西，有三种方法：|1945944|实例化|1945945|基本上，您刚才所做的是实例化一个reader对象并调用它的方法。|1945946|类中的类|offset|length|1945947|如果其中一个类是子类，则子类可以使用父类方法。|1945948|继承|1945949|使该类继承另一个类的属性。一旦你掌握了它的诀窍，它是非常强大和有趣的。|1945950|entityMap|0|LINK|mutability|MUTABLE|url|http://www.diveintopython.net/object_oriented_framework/defining_classes.html|1|http://www.tutorialspoint.com/python/python_classes_objects.htm^0|0|0|0|0|0|0|4|0|0|0|0|2|1|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|18|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|19|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1A|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1B|8|@]|9|@$O|1C|P|1D|1|1E]]|A|$]]|$1|Q|3|R|5|6|7|1F|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1G|8|@]|9|@$O|1H|P|1I|1|1J]]|A|$]]|$1|U|3|V|5|6|7|1K|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13]]|14|$5|Z|10|11|A|$12|15]]]]

Python always implicitly passes the object to the function, that's why you get the error. You solve this by changing it to 

<pre><code>getUsername(self):
...
return username
</code></pre>

Classes are used for this very reason, so that you encapsulate the functions and variables into objects that are only available to themselves. In order for a completely different object to have access to stuff inherent to something else, there's three ways:

Instantiation

Basically what you just did, you instantiated a reader object and called it's method.

<a href="http://www.diveintopython.net/object_oriented_framework/defining_classes.html" rel="nofollow">Class in a class</a>

If one of the classes is a child class, the child can use the parents methods.

<a href="http://www.tutorialspoint.com/python/python_classes_objects.htm" rel="nofollow">Inheritance</a>

You make the class inherit the properties of the other class. It's very powerful and fun once you get the hang of it.

blocks|key|1945985|text|python模块中的每个函数都需要有作为self的第一个参数，这没有任何具体的意义，但是如果您不遵循约定，您肯定会陷入错误状态。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1945986|class+Reader():
++++def+getUsername(self):
++++++++....

++++def+getAddress(self):
++++++++.....|code-block|syntax|javascript|1945987|您可以参考下面的文档以获得更多信息Python类|offset|length|1945988|entityMap|0|LINK|mutability|MUTABLE|url|http://www.tutorialspoint.com/python/python_classes_objects.htm^0|0|0|H|7|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Each function in python module needs to have first argument as self,
This is not having any specific meaning but if you don’t follow the convention you will definitely land into the error state.

<pre><code>class Reader():
 def getUsername(self):
 ....

 def getAddress(self):
 .....
</code></pre>

You can refer following doc for more info <a href="http://www.tutorialspoint.com/python/python_classes_objects.htm" rel="nofollow">Python Classes</a>

I'm very new to python and Sikuli software. :( 
I was trying to call a function from another class.
Here is a class which contains the functions.

<pre><code>class Reader():
 def getUsername():
 ....
 return username

 def getAddress():
 .....
 return address
</code></pre>

Here is another class which calls the functions stated above.

<pre><code>class DisplayInfo():
 reader = Reader()
 uName = reader.getUsername()
 addr = reader.getAddress()
 ......
 ......
</code></pre>

But when I ran DisplayInfo class, I got this error.

<pre><code>uName = reader.getUsername()
TypeError: getUsername() takes no arguments (1 given)
</code></pre>

Could anyone help me solve this? Thanks so much in advance!

How to call a function from another class in python?

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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我对python和Sikuli软件非常陌生。：:(我试图从另一个类调用一个函数。下面是一个包含函数的类。class Reader():    def getUsername():        ....        return username    def getAddress():        .....        return address下面是另一个类，它调用上述函数。clas

问如何从python中的另一个类调用函数？
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问如何从python中的另一个类调用函数？
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