Feature Requests item #1534942, was opened at 2006-08-04 23:19
Message generated for change (Comment added) made by josiahcarlson
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Category: Python Interpreter Core
Group: Python 2.6
Status: Open
Resolution: None
Priority: 5
Submitted By: Marc W. Abel (gihon)
Assigned to: Nobody/Anonymous (nobody)
Summary: Print identical floats consistently
Initial Comment:
Hello again and thank you,
This is a rewrite of now-closed bug #1534769.
As you know,
>>> print .1
>>> print (.1,)
give different results because the __str__ call from
print becomes a __repr__ call on the tuple, and it
stays a __repr__ beneath that point in any recursion.
>From the previous discussion, we need behavior like
this so that strings are quoted inside tuples.
I suggest that print use a third builtin that is
neither __str__ nor __repr__. The name isn't
important, but suppose we call it __strep__ in this
feature request. __strep__ would pass __strep__ down
in the recursion, printing floats with __str__ and
everything else with __repr__.
This would then
>>> print .1 and
>>> print (.1,)
with the same precision.
Marc
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Comment By: Josiah Carlson (josiahcarlson)
Date: 2006-08-09 09:14
Message:
Logged In: YES
user_id=341410
Please note that 'print non_string' is a convenience. Its
output is neither part of the language spec, nor is the
propagation of str/repr calls.
If you want to control how items are formatted during print,
you should use the built-in string formatting mechanisms.
The standard 'print "%.1f"%(.1,)' and 'print
"%(x).1f"%({x:.1})' works with all pythons, and there is an
updated templating mechanism available in more recent Python
versions.
I'm not the last word on this, but I don't see an actual
use-case that isn't satisfied by using built-in
string-formatting.
----------------------------------------------------------------------
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