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problems with Methods in Python 3.4.2

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  problems with Methods in Python 3.4.2 Marcus Lütolf <marcus.luetolf@bluewin.ch> - 2014-12-18 18:27 +0100
    Re: problems with Methods in Python 3.4.2 André Roberge <andre.roberge@gmail.com> - 2014-12-18 09:44 -0800
    Re: problems with Methods in Python 3.4.2 John Gordon <gordon@panix.com> - 2014-12-18 18:45 +0000

#82643 — problems with Methods in Python 3.4.2

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Hello Dears,

1)I am trying to do this:

 

>>> dir(_builtins_)

 

I am getting this:

Traceback (most recent call last):

  File "<pyshell#0>", line 1, in <module>

    dir(_builtins_)

NameError: name '_builtins_' is not defined

 

2)I am trying to do this:

 

>>> 'TTA',_add_('GGA')

 

I’am getting this :

Traceback (most recent call last):

  File "<pyshell#0>", line 1, in <module>

    'TTA',_add_('GGA')

NameError: name '_add_' is not defined

 

3)I am trying to do this:

 

>>> -3  .abs()

 

I’am getting this

Traceback (most recent call last):

  File "<pyshell#1>", line 1, in <module>

    -3 .abs()

AttributeError: 'int' object has no attribute 'abs'

 

4) finally, after printing

 

>>>abs._doc_()

 

I am getting this (and so on) :

Traceback (most recent call last):

  File "<pyshell#2>", line 1, in <module>

    abs._doc_()

AttributeError: 'builtin_function_or_method' object has no attribute '_doc_'

What did I do wrong ? Thanks for help, Marcus Luetolf, M.D., 90 Bondastreet,
CH-7000 Chur, Switzerland.

 



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#82644

On Thursday, 18 December 2014 13:28:33 UTC-4, Marcus Lütolf  wrote:
> Hello Dears,
> 1)I am trying to do this:
>  
> >>> dir(_builtins_)
You need two underscore characters on each sides:

dir(__builtins__)

>  
> I am getting this:
> Traceback (most recent call last):
>   File "<pyshell#0>", line 1, in <module>
>     dir(_builtins_)
> NameError: name '_builtins_' is not defined
>  
> 2)I am trying to do this:
>  
> >>> 'TTA',_add_('GGA')
Same; magic methods have two underscore characters on each side.
>  
> I'am getting this :
> Traceback (most recent call last):
>   File "<pyshell#0>", line 1, in <module>
>     'TTA',_add_('GGA')
> NameError: name '_add_' is not defined
>  
> 3)I am trying to do this:
>  
> >>> -3  .abs()
abs(-3)      abs is a function in Python.

See http://lucumr.pocoo.org/2011/7/9/python-and-pola/ for a good explanation...

>  
> I'am getting this
> Traceback (most recent call last):
>   File "<pyshell#1>", line 1, in <module>
>     -3 .abs()
> AttributeError: 'int' object has no attribute 'abs'
>  
> 4) finally, after printing
>  
> >>>abs._doc_()
>  

Guess why!  ;-)

> I am getting this (and so on) :
> Traceback (most recent call last):
>   File "<pyshell#2>", line 1, in <module>
>     abs._doc_()
> AttributeError: 'builtin_function_or_method' object has no attribute '_doc_'
> 
> What did I do wrong ? Thanks for help, Marcus Luetolf, M.D., 90 Bondastreet, CH-7000 Chur, Switzerland.
>  
> 
> 
> 
> 
> 
> 	
> 		
> 			
> 				
> 			
> 		
> 		
> 			
> 
> 				Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft.
> 				
> www.avast.com

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#82649

In <mailman.17037.1418923700.18130.python-list@python.org> =?iso-8859-1?Q?Marcus_L=FCtolf?= <marcus.luetolf@bluewin.ch> writes:

> >>> dir(_builtins_)
> >>> 'TTA',_add_('GGA')
> >>>abs._doc_()

These errors are due to using single underscores instead of double
underscores.  I.e. use __builtins__ instead of _builtins_.

> >>> -3  .abs()
> AttributeError: 'int' object has no attribute 'abs'

Integer objects don't have a built-in function named abs().  If you
want the absolute value of an integer, call abs directly, like so:

abs(-3)

-- 
John Gordon         Imagine what it must be like for a real medical doctor to
gordon@panix.com    watch 'House', or a real serial killer to watch 'Dexter'.

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