Feature Requests item #1155485, was opened at 2005-03-03 00:48
Message generated for change (Comment added) made by loewis
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Category: Python Interpreter Core
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Felix Lee (felixlee)
Assigned to: Nobody/Anonymous (nobody)
Summary: file() on a file
Initial Comment:
it would be nice if file(f) worked when f is already a
file, either by returning f or by constructing a new
file that refers to the same thing. that would make it
easy to write functions that can take either a file or
a filename as an argument, like so:
def p(f): print list(file(f))
which is kind of like using int() as a cast operation.
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>Comment By: Martin v. Löwis (loewis)
Date: 2005-03-13 23:53
Message:
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user_id=21627
It's not at all obvious what this should do. Three
alternatives come to mind:
1. return f
2. return a wrapper object which delegates all calls
3. return a new file object, which is dup(2)'ed from the
original one.
Either of them might be meaningful in some context, and they
are mutually incompatible. In the face of ambiguity, refuse
the temptation to guess, so I'm -1.
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