Ad:

Python Discussion Thread
Marked Solved
Views: 5026

Oct 24th, 2007

super function

Expand Post »

Python Syntax (Toggle Plain Text)
class x(object):
    def __init__(self):
        self.x=1
 
class y(x):
    def __init__(self):
        super(y, self).__init__()
class x(object):
    def __init__(self):
        self.x=1

class y(x):
    def __init__(self):
        super(y, self).__init__()

what is it doing "super" function in here?

Similar Threads

Function that returns void in C++
How to develop a new program in C++
What super power would you most likely want? in Geeks' Lounge

night_guard

Reputation Points: 10

Solved Threads: 0

Newbie Poster

Offline

3 posts
since Oct 2007

Permalink

Oct 24th, 2007

Re: super function

The super() function allows you to access methods in the parent x that are shadowed by methods of the same name in the child y.

In this case, y.__init__ wants to call x.__init__. But the problem is that y.__init__ clobbers __init__ in the namespace; that is, x.__init__ doesn't get inherited. SO, super(y, self) returns x, so that your code means this:

Python Syntax (Toggle Plain Text)
class x(object):
    def __init__(self):
        self.x=1
 
class y(x):
    def __init__(self):
        x.__init__(self)
class x(object):
    def __init__(self):
        self.x=1

class y(x):
    def __init__(self):
        x.__init__(self)

Jeff

jrcagle

Reputation Points: 92

Solved Threads: 156

Practically a Master Poster

Offline

608 posts
since Jul 2006

Permalink

Oct 26th, 2007

Re: super function

thanks

night_guard

Reputation Points: 10

Solved Threads: 0

Newbie Poster

Offline

3 posts
since Oct 2007

Permalink

Dec 30th, 2010

Re: super function

Python Syntax (Toggle Plain Text)
class x(object):
    def __init__(self):
        self.x=1
 
class z(object):
    def __init__(self):
        self.z=1
 
class y(x,z):
    def __init__(self):
        super(y, self).__init__()
class x(object):
    def __init__(self):
        self.x=1

class z(object):
    def __init__(self):
        self.z=1

class y(x,z):
    def __init__(self):
        super(y, self).__init__()

And what is it doing "super" function in here?

Scorpiusix

Reputation Points: 10

Solved Threads: 1

Newbie Poster

Offline

1 posts
since Dec 2010

Permalink

Dec 30th, 2010

Re: super function

Click to Expand / Collapse Quote originally posted by Scorpiusix ...

Python Syntax (Toggle Plain Text)
class x(object):
    def __init__(self):
        self.x=1
 
class z(object):
    def __init__(self):
        self.z=1
 
class y(x,z):
    def __init__(self):
        super(y, self).__init__()
class x(object): def __init__(self): self.x=1 class z(object): def __init__(self): self.z=1 class y(x,z): def __init__(self): super(y, self).__init__()
And what is it doing "super" function in here?

It calls x.__init__():

python Syntax (Toggle Plain Text)
class x(object):
    def __init__(self):
        print ("x.__init__()")
        self.x=1
 
class z(object):
    def __init__(self):
        print ("z.__init__()")
        self.z=1
 
class y(x,z):
    def __init__(self):
        super(y, self).__init__()
 
y()
 
"""my output -->
x.__init__()
"""
class x(object):
    def __init__(self):
        print ("x.__init__()")
        self.x=1

class z(object):
    def __init__(self):
        print ("z.__init__()")
        self.z=1

class y(x,z):
    def __init__(self):
        super(y, self).__init__()

y()

"""my output -->
x.__init__()
"""

Super is not very useful. Call x.__init__() directly.

Gribouillis

Reputation Points: 930

Solved Threads: 666

Posting Maven

Offline

2,655 posts
since Jul 2008

This thread is solved

Either the thread starter or a moderator has marked this thread as solved. You can most likely trust the responses and answers given. There is most likely no reason for any further responses to be posted here. If you have a related question, please start a new thread in this forum instead.

This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

Previous Thread in Python Forum Timeline: Telnetlib help

Next Thread in Python Forum Timeline: CRC-24

DaniWeb Message

Cancel Changes

User Name
Password