大约有 30,000 项符合查询结果（耗时：0.0335秒） [XML]
Check if all elements in a list are identical
...parison from a == b to a is b.
timeit result, for Python 2.7 and (only s1, s4, s7, s9 should return True)
s1 = [1] * 5000
s2 = [1] * 4999 + [2]
s3 = [2] + [1]*4999
s4 = [set([9])] * 5000
s5 = [set([9])] * 4999 + [set([10])]
s6 = [set([10])] + [set([9])] * 4999
s7 = [1,1]
s8 = [1,2]
s9 = []
we...
Change default app.config at runtime
I have the following problem:
We have an application that loads modules (add ons). These modules might need entries in the app.config (e.g. WCF configuration). Because the modules are loaded dynamically, I don't want to have these entries in the app.config file of my application.
What I would li...
Finding what branch a Git commit came from
...ter Mortensen
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answered Mar 8 '18 at 19:54
khichar.anilkhichar.anil
3,4...
Comparing strings by their alphabetical order
...
Take a look at the String.compareTo method.
s1.compareTo(s2)
From the javadocs:
The result is a negative integer if
this String object lexicographically
precedes the argument string. The
result is a positive integer if this
String object lexicographically...
How do I compare two string variables in an 'if' statement in Bash? [duplicate]
...
For string equality comparison, use:
if [[ "$s1" == "$s2" ]]
For string does NOT equal comparison, use:
if [[ "$s1" != "$s2" ]]
For the a contains b, use:
if [[ $s1 == *"$s2"* ]]
(and make sure to add spaces between the symbols):
Bad:
if [["$s1" == "$s2"]]
G...
is vs typeof
...
Jay BazuziJay Bazuzi
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7
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How do you detect where two line segments intersect? [closed]
...
Gareth ReesGareth Rees
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5
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Get the Row(s) which have the max count in groups using groupby
...
In [1]: df
Out[1]:
Sp Mt Value count
0 MM1 S1 a 3
1 MM1 S1 n 2
2 MM1 S3 cb 5
3 MM2 S3 mk 8
4 MM2 S4 bg 10
5 MM2 S4 dgd 1
6 MM4 S2 rd 2
7 MM4 S2 cb 2
8 MM4 S2 uyi 7
In [2]: df.group...
configure: error: C compiler cannot create executables
... Command line Tools packages ars now available at: developer.apple.com/downloads
– Danny D'Amours
Sep 11 '14 at 23:56
3
...
How can I select rows with most recent timestamp for each key value?
...on:
SELECT sensorID,timestamp,sensorField1,sensorField2
FROM sensorTable s1
WHERE timestamp = (SELECT MAX(timestamp) FROM sensorTable s2 WHERE s1.sensorID = s2.sensorID)
ORDER BY sensorID, timestamp;
Pretty self-explaining I think, but here's more info if you wish, as well as other examples. It'...