[ python-Feature Requests-1205239 ] Let shift operators take any integer value

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Feature Requests item #1205239, was opened at 2005-05-19 12:54
Message generated for change (Comment added) made by josiahcarlson
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Category: Python Interpreter Core
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: David Albert Torpey (dtorp)
Assigned to: Nobody/Anonymous (nobody)
Summary: Let shift operators take any integer value

Initial Comment:
Let:  
    1 >> -4 
be interpreted as:
    1 << 4

This should be easy to do.  It would be somewhat helpful for 
bit manipulations and multiplying by powers of two.  Without 
the change, my code is laced with sections like:

if y > 0:
    z = x << y
else:
    z = x >> -y

This is ugly and slow compared to a straight:
   z = x << y

There is a precedent.  See what is done with negative list 
indices for comparison.  It saves even less code with  x[len
(x)-i] becoming x[i].  The reason for doing it is code 
simplication and clarity.


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Comment By: Josiah Carlson (josiahcarlson)
Date: 2005-05-26 01:01

Message:
Logged In: YES 
user_id=341410

Is your code time critical?  Do your numbers have more than
53 bits of precision?  Do your numbers vary beyond 2**1024
or 1/2**1024?

If not, then the following should be sufficient for your
uses: int(x * 2**y)

----------------------------------------------------------------------

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