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How to format numbers? [duplicate]
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MichaelMichael
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How to return dictionary keys as a list in Python?
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answered May 29 '13 at 16:25
Chris Chris
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How to use string.replace() in python 3.x
The string.replace() is deprecated on python 3.x. What is the new way of doing this?
8 Answers
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[] and {} vs list() and dict(), which is better?
...gt;> from timeit import timeit
>>> timeit("[]")
0.040084982867934334
>>> timeit("list()")
0.17704233359267718
>>> timeit("{}")
0.033620194745424214
>>> timeit("dict()")
0.1821558326547077
and for non-empty:
>>> timeit("[1,2,3]")
0.24316302770330367
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Cost of len() function
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360
It's O(1) (constant time, not depending of actual length of the element - very fast) on every ...
PHP append one array to another (not array_push or +)
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436
array_merge is the elegant way:
$a = array('a', 'b');
$b = array('c', 'd');
$merge = array_mer...
How to filter a dictionary according to an arbitrary condition function?
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434
Nowadays, in Python 2.7 and up, you can use a dict comprehension:
{k: v for k, v in points.ite...
using awk with column value conditions
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132
If you're looking for a particular string, put quotes around it:
awk '$1 == "findtext" {print ...
How to count the number of occurrences of an element in a List
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341
I'm pretty sure the static frequency-method in Collections would come in handy here:
int occu...
How can I convert a dictionary into a list of tuples?
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363
>>> d = { 'a': 1, 'b': 2, 'c': 3 }
>>> d.items()
[('a', 1), ('c', 3), ('b', ...