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How to compare two colors for similarity/difference
...L/LAB would be significantly better colour spaces than (s)RGB for distance-based similarity matching.
– Jon Purdy
Jan 26 '12 at 13:11
5
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What is “above-the-fold content” in Google Pagespeed?
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Safe (bounds-checked) array lookup in Swift, through optional bindings?
... only when it's safe, and nil otherwise
• What should this functionality base it's implementation on?
- Array subscripting
• Where does it get this feature from?
- Its definition of struct Array in the Swift module has it
• Nothing more generic/abstract?
- It adopts protocol CollectionType whi...
How do you push just a single Git branch (and no other branches)?
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Java packages com and org
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What does tree-ish mean in Git?
...d
Git like an content- addressable filesystem, i.e. files can be retrieved
based on their content (sha1 IDs are generated from file content). The Pro Git
book gives this example diagram:
Many Git commands can accept special identifiers for commits and (sub)directory
trees:
"Commit-ish" are iden...
How can you dynamically create variables via a while loop? [duplicate]
... It seems there is no salvation outside dictionaries. Anyway, Python is based on objects and use mappings between the names and the objects everywhere, it's the data model, so it isn't possible to escape to that fact. That's what I think. Am I wrong ?
– eyquem
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Express-js wildcard routing to cover everything under and including a path
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In javascript, is an empty string always false as a boolean?
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Django FileField with upload_to determined at runtime
...ation:
In most cases, this object will not have been saved to the database yet, so if it uses the default AutoField, it might not yet have a value for its primary key field.
Therefore the validity of using pk depends on how your particular model is defined.
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