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Distinguishing attribute name from varible name to make codes clear and definite

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  Distinguishing attribute name from varible name to make codes clear and definite luofeiyu <elearn2014@gmail.com> - 2014-08-21 22:13 +0800
    Re: Distinguishing attribute name from varible name to make codes clear and definite Denis McMahon <denismfmcmahon@gmail.com> - 2014-08-21 14:23 +0000

#76738 — Distinguishing attribute name from varible name to make codes clear and definite

I feel that self.x and x will be confused in the following codes.

     class MyDescriptor(object):
          def __init__(self, x):
              self.x = x
          def __get__(self, instance, owner):
              print('get from descriptor')
              return self.x
          def __set__(self, instance, value):
              print('set from descriptor')
              self.x = value
          def __delete__(self, instance):
              print('del from descriptor, the val is', self.x)

     exam=MyDescriptor("hallo")


when class MyDescriptor  initiate , the `hallo` was passed into x in 
__init__(self, x);
Literally  self.x maybe understood to be self.hallo ,assign a attribute 
named 'hallo' to instance exam.
It is a better way to replace self.x to self.y .

     class MyDescriptor(object):
          def __init__(self, x):
              self.y = x
          def __get__(self, instance, owner):
              print('get from descriptor')
              return self.y
          def __set__(self, instance, value):
              print('set from descriptor')
              self.y = value
          def __delete__(self, instance):
              print('del from descriptor, the val is', self.y)
     exam=MyDescriptor("hallo")


There is a attribute y  in instance exam , the `hallo` was passed into x 
in __init__(self, x).No any relation between x and y ,`hallo` and y.
My view is correct or not ?

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#76739

On Thu, 21 Aug 2014 22:13:32 +0800, luofeiyu wrote:

> I feel that self.x and x will be confused in the following codes.

Then don't call them self.x and x, call them self.internal_x and param_x, 
or any other pair of different names.

You are the one who chooses what names to use in your code.

-- 
Denis McMahon, denismfmcmahon@gmail.com

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