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Best way to simulate “group by” from bash?
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429
sort ip_addresses | uniq -c
This will print the count first, but other than that it should be...
Java how to replace 2 or more spaces with single space in string and delete leading and trailing spa
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29 Answers
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Can hash tables really be O(1)?
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edited May 5 '10 at 8:21
answered May 5 '10 at 7:51
Mar...
What is the maximum value for an int32?
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How to do a FULL OUTER JOIN in MySQL?
...e SAMPLE transcribed from this SO question you have:
with two tables t1, t2:
SELECT * FROM t1
LEFT JOIN t2 ON t1.id = t2.id
UNION
SELECT * FROM t1
RIGHT JOIN t2 ON t1.id = t2.id
The query above works for special cases where a FULL OUTER JOIN operation would not produce any duplicate rows. The ...
Creating a new dictionary in Python
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Jan VorcakJan Vorcak
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How to avoid “RuntimeError: dictionary changed size during iteration” error?
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In Python 2.x calling keys makes a copy of the key that you can iterate over while modifying the dict:
for i in d.keys():
Note that this doesn't work in Python 3.x because keys returns an iterator instead of a list.
Another way is ...
Pairwise crossproduct in Python [duplicate]
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You're looking for itertools.product if you're on (at least) Python 2.6.
>>> import itertools
>>> a=[1,2,3]
>>> b=[4,5,6]
>>> itertools.product(a,b)
<itertools.product object at 0x10049b870>
>>> list(itertools.product(a,b))
[(1, 4), (1, 5), ...
Delete multiple records using REST
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92
Is a viable RESTful choice, but obviously has the limitations you have described.
Don't do this...