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How to round an average to 2 decimal places in PostgreSQL?
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283
PostgreSQL does not define round(double precision, integer). For reasons @Mike Sherrill 'Cat R...
Gradle store on local file system
...downloaded jar files on the local file system? Maven stores them in the .m2 directory under USER_HOME , but where does Gradle store them? I checked the .gradle folder there, but saw only compiled scripts.
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App Inventor 2 App上架国内应用市场完整指南 · App Inventor 2 中文网
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Index all *except* one item in python
...lement:
a = range(10)[::-1] # [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
b = [x for i,x in enumerate(a) if i!=3] # [9, 8, 7, 5, 4, 3, 2, 1, 0]
This is very general, and can be used with all iterables, including numpy arrays. If you replace [] with (), b will be an iterator instead of...
What does 'synchronized' mean?
...hout the synchronized keyword, your thread 1 may not see the change thread 2 made to foo, or worse, it may only be half changed. This would not be what you logically expect.
Again, this is a non-trivial topic in Java. To learn more, explore topics here on SO and the Interwebs about:
Concurrenc...
Pairs from single list
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52
My favorite way to do it:
from itertools import izip
def pairwise(t):
it = iter(t)
ret...
Python Dictionary Comprehension
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528
There are dictionary comprehensions in Python 2.7+, but they don't work quite the way you're tr...
Which is faster: while(1) or while(2)?
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23 Answers
23
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Get Android API level of phone currently running my application [duplicate]
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412
Check android.os.Build.VERSION, which is a static class that holds various pieces of information...