Message 73026 - Python tracker

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Author	skip.montanaro
Recipients	ghaering, gregburd, gregory.p.smith, jcea, josiahcarlson, pitrou, rhettinger, skip.montanaro
Date	2008-09-11.13:46:50
SpamBayes Score	0.007280589
Marked as misclassified	No
Message-id	<18633.8505.897080.992468@montanaro-dyndns-org.local>
In-reply-to	<1221138620.5667.1.camel@fsol>

Content
>> I'd like to guarantee that zip(db.keys(), db.values() == db.items(). Antoine> It doesn't sound very useful, and it may hurt performance on Antoine> big tables. Actually, I think Python guarantees (for dicts at least - other mappings should probably follow suit) that if you call keys() then call values() without making any changes to the dict that their orders match, e.g., that zip(d.keys(), d.values()) == d.items() Skip

>> I'd like to guarantee that zip(db.keys(), db.values() == db.items().

    Antoine> It doesn't sound very useful, and it may hurt performance on
    Antoine> big tables.

Actually, I think Python guarantees (for dicts at least - other mappings
should probably follow suit) that if you call keys() then call values()
without making any changes to the dict that their orders match, e.g., that

    zip(d.keys(), d.values()) == d.items()

Skip

History
Date	User	Action	Args
2008-09-11 13:48:04	skip.montanaro	set	recipients: + skip.montanaro, rhettinger, gregory.p.smith, jcea, ghaering, josiahcarlson, pitrou, gregburd
2008-09-11 13:46:50	skip.montanaro	link	issue3783 messages
2008-09-11 13:46:50	skip.montanaro	create