[ python-Bugs-1118977 ] builtin file() vanishes

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Bugs item #1118977, was opened at 2005-02-09 00:42
Message generated for change (Settings changed) made by loewis
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Category: None
Group: None
>Status: Closed
>Resolution: Invalid
Priority: 5
Submitted By: Barry Alan Scott (barry-scott)
Assigned to: Nobody/Anonymous (nobody)
Summary: builtin file() vanishes

Initial Comment:
The attached files reproduce a wierd problem where by
the builtin file() function completely vanishes from
python.
Notice that __builtin__ changes type from module to dict.

In the attached tar files find:
   manufacture    - main program
   bob.py            - module
   a.a                 - file to open

Untar and run:

python manufacture

Notice that file()is no ware to be found in side of bob.py

This runs the same on all 2.3 and 2.4 on Windows, Linux
and Mac OS X.


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>Comment By: Martin v. Löwis (loewis)
Date: 2005-02-10 01:02

Message:
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As Tim says, __builtins__ is a dictionary sometimes.
Therefore, it is no surprise that __builtins__.file does not
exist - dictionaries don't have a file attribute. As this is
apparently what you meant when you said that file()
"vanishes", I'm closing the report as invalid.

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Comment By: Tim Peters (tim_one)
Date: 2005-02-09 04:51

Message:
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No, __builtins__ (note the trailing 's') changes type from 
module to module, not __builtin__.  __builtins__ is an 
implementation detail, and you shouldn't use it at all.  
__builtin__ (no trailing 's') is a built-in module, and you're free 
to use that, but then you have to import it explicitly:

import __builtin__
__builtin__.file

There's more in the Language (not Library) reference manual, 
in the section "Naming and Binding".

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