[ python-Bugs-877675 ] Dictionary comprehension
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Thu Jan 15 17:29:51 EST 2004
Bugs item #877675, was opened at 2004-01-15 11:57
Message generated for change (Comment added) made by rhettinger
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Category: Python Interpreter Core
Group: Feature Request
>Status: Closed
>Resolution: Later
Priority: 5
Submitted By: James Bond (james_007_bond)
Assigned to: Nobody/Anonymous (nobody)
Summary: Dictionary comprehension
Initial Comment:
Would it be possible to extend the list comprehension to
dictionaries ?
I found myself typing a line of the form:
dict = { x: x**2 for x in range(10) }
which seems pretty clear to me... But the interpreter is
telling me it's not supported! Damn! I had to go through
creating a list instead, and then use it to create my
dictionary.
dict = dict([(x, x**2) for x in range(10)])
By extending the dictionary syntax it seems the intermediate
list creation could be avoided, and my proposed code looks
clearer to me.
[using Python 2.3.3, on MacOS X 10.3.2]
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>Comment By: Raymond Hettinger (rhettinger)
Date: 2004-01-15 17:29
Message:
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This feature is subsumed by generator expressions which have
been accepted for Py2.4. It will basically give you what
your look for (list comp style expression without creating
the intermediate list):
d = dict((x, x**2) for x in xrange(10))
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Comment By: Barry A. Warsaw (bwarsaw)
Date: 2004-01-15 12:29
Message:
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See PEP 274
http://www.python.org/peps/pep-0274.html
I like the idea too, but it doesn't seem to have gained
widespread support yet.
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