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Reverse a string in Python
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How about:
>>> 'hello world'[::-1]
'dlrow olleh'
This is extended slice syntax. It works by doing [begin:end:step] - by leaving begin and end off and specifying a step of -1, it reverses a string.
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Can hash tables really be O(1)?
It seems to be common knowledge that hash tables can achieve O(1), but that has never made sense to me. Can someone please explain it? Here are two situations that come to mind:
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Which iOS app version/build number(s) MUST be incremented upon App Store release?
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bundle install fails with SSL certificate verification error
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Update
Now that I've karma wh..err mined enough from this answer everyone should know that thi...
Lambda function in list comprehensions
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The first one creates a single lambda function and calls it ten times.
The second one doesn't ca...
Add single element to array in numpy
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append() creates a new array which can be the old array with the appended element.
I think it...
Get the index of the nth occurrence of a string?
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How to create NS_OPTIONS-style bitmask enumerations in Swift?
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