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PO
primarykey
Id
9663900
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
9
CommunityOwnedDate
CreationDate
2012-03-12T08:41:11.437
FavoriteCount
0
LastActivityDate
2012-03-12T09:34:52.767
LastEditDate
2012-03-12T09:34:52.767
LastEditorUserId
989121
OwnerUserId
1177025
ParentId
9663849
PostTypeId
2
Score
9
ViewCount
0
LastEditorDisplayName
text
Body
In Python 3.x you can simply do what you want: <pre><code>A.print_x(b) #<-- 'eggs' </code></pre> If you only have an instance of 'A', then get the class first: <pre><code>a.__class__.print_x(b) #<-- 'eggs' </code></pre> In Python 2.x (which the OP uses) this doesn't work, as noted by the OP and explained by Amber in the comments: <blockquote> This is a difference between Python 2.x and Python 3.x - methods in 3.x don't enforce being passed the same class. </blockquote> <h2>More details (OP edit)</h2> In python 2, <code>A.print_x</code> returns an "unbound method", which cannot be directly applied to other classes' objects: <blockquote> When an unbound user-defined method object is called, the underlying function (im_func) is called, with the restriction that the first argument must be an instance of the proper class (im_class) or of a derived class thereof. >> <a href="http://docs.python.org/reference/datamodel.html" rel="noreferrer">http://docs.python.org/reference/datamodel.html</a> </blockquote> To work around this restriction, we first have to obtain a "raw" function from a method, via <code>im_func</code> or <code>__func__</code> (2.6+), which then can be called passing an object. This works on both classes and instances: <pre><code># python 2.5- A.print_x.im_func(b) a.print_x.im_func(b) # python 2.6+ A.print_x.__func__(b) a.print_x.__func__(b) </code></pre> In python 3 there's no such thing anymore as unbound method. <blockquote> Unbound methods are gone for good. ClassObject.method returns an ordinary function object, instance.method still returns a bound method object. >> <a href="http://www.python.org/getit/releases/3.0/NEWS.txt" rel="noreferrer">http://www.python.org/getit/releases/3.0/NEWS.txt</a> </blockquote> Hence, in python 3, <code>A.print_x</code> is just a function, and can be called right away and <code>a.print_x</code> still has to be unbounded: <pre><code># python 3.0+ A.print_x(b) a.print_x.__func__(b) </code></pre>
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