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how to concatenate two dictionaries to create a new one in Python? [duplicate]
...nate the items and call dict on the resulting list:
$ python -mtimeit -s'd1={1:2,3:4}; d2={5:6,7:9}; d3={10:8,13:22}' \
'd4 = dict(d1.items() + d2.items() + d3.items())'
100000 loops, best of 3: 4.93 usec per loop
Fastest: exploit the dict constructor to the hilt, then one update:
$ python -mtim...
Is PHP's count() function O(1) or O(n) for arrays?
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136
Well, we can look at the source:
/ext/standard/array.c
PHP_FUNCTION(count) calls php_count_r...
SQL query to group by day
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if you're using SQL Server,
dateadd(DAY,0, datediff(day,0, created)) will return the day crea...
Difference between CTE and SubQuery?
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103
In the sub-query vs simple (non-recursive) CTE versions, they are probably very similar. You w...
Unix command to find lines common in two files
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Is there a difference between using a dict literal and a dict constructor?
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How to use background thread in swift?
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error: default argument given for parameter 1
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How do you write tests for the argparse portion of a python module? [closed]
... main function you should just call it with:
parser = parse_args(sys.argv[1:])
(where the first element of sys.argv that represents the script name is removed to not send it as an additional switch during CLI operation.)
In your tests, you can then call the parser function with whatever list of ...