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Removing duplicates from a list of lists
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>>> k = [[1, 2], [4], [5, 6, 2], [1, 2], [3], [4]]
>>> import itertools
>>> k.sort()
>>> list(k for k,_ in itertools.groupby(k))
[[1, 2], [3], [4], [5, 6, 2]]
itertools often offers the fastest and most powerful so...
How to perform element-wise multiplication of two lists?
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14 Answers
14
Active
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Java regex capturing groups indexes
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1-----1 | | 4------4 |5-------5 |
| 3---------------3 |
2-----------------------------------------2
The group numbers are used in back-reference...
Should I use document.createDocumentFragment or document.createElement
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edited Aug 3 '14 at 13:39
answered Aug 3 '10 at 14:04
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When to use os.name, sys.platform, or platform.system?
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edited Aug 30 '19 at 16:49
Brand0R
81666 silver badges1414 bronze badges
answered Jul 26 '12 at 17:43
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str performance in python
...tly) faster than str:
>>> Timer('str(x)', 'x=100').timeit()
0.25641703605651855
>>> Timer('"%s" % x', 'x=100').timeit()
0.2169809341430664
Do note that str is still slightly slower, as @DietrichEpp said, this is because str involves lookup and function call operations, while % c...
Crontab Day of the Week syntax
... Sunday
1 - Mon Monday
2 - Tue Tuesday
3 - Wed Wednesday
4 - Thu Thursday
5 - Fri Friday
6 - Sat Saturday
7 - Sun Sunday
Graphically:
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