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How to get multiple counts with one SQL query?
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729
You can use a CASE statement with an aggregate function. This is basically the same thing as a ...
python generator “send” function purpose?
..._inputs():
... while True:
... x = yield
... yield x * 2
...
>>> gen = double_inputs()
>>> next(gen) # run up to the first yield
>>> gen.send(10) # goes into 'x' variable
20
>>> next(gen) # run up to the next yield
>>> g...
How to empty a list?
... label with a new empty list:
del lst[:]
Here's an example:
lst1 = [1, 2, 3]
lst2 = lst1
del lst1[:]
print(lst2)
For the sake of completeness, the slice assignment has the same effect:
lst[:] = []
It can also be used to shrink a part of the list while replacing a part at the same time (but ...
How do I count the number of occurrences of a char in a String?
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What is the benefit of using $() instead of backticks in shell scripts?
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An example, though somewhat contrived:
deps=$(find /dir -name $(ls -1tr 201112[0-9][0-9]*.txt | tail -1l) -print)
which will give you a list of all files in the /dir directory tree which have the same name as the earliest dated text file from December 2011 (a).
Another example would be somethi...
Convert a string representation of a hex dump to a byte array using Java?
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24 Answers
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How to find out which processes are using swap space in Linux?
...sing
81M of swap, but it also reports my system as a whole is using only 2M
of swap. Therefore, I will not add a similar Swap column to htop
because I don't know a reliable way to get this information (actually,
I don't think it's possible to get an exact number, because of shared
pages).
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How do I print the type of a variable in Rust?
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182
If you merely wish to find out the type of a variable and are willing to do it at compile time, ...
how to ignore namespaces with XPath
... Dirk VollmarDirk Vollmar
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9
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Mocking python function based on input arguments
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>>> m = MagicMock(side_effect=side_effect)
>>> m(1)
2
>>> m(2)
3
>>> m.mock_calls
[call(1), call(2)]
http://www.voidspace.org.uk/python/mock/mock.html#calling
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