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Selecting with complex criteria from pandas.DataFrame
...that & operator takes a precedence over operators such as > or < etc. That is why
4 < 5 & 6 > 4
evaluates to False. Therefore if you're using pd.loc, you need to put brackets around your logical statements, otherwise you get an error. That's why do:
df.loc[(df['A'] > 10) ...
What's the best way to share data between activities?
...ashMap of WeakReferences
Persist objects (sqlite, share preferences, file, etc.)
TL;DR: there are two ways of sharing data: passing data in the intent's extras or saving it somewhere else. If data is primitives, Strings or user-defined objects: send it as part of the intent extras (user-defined ob...
What does the caret operator (^) in Python do?
...an do binary numbers by typing 0bX where X is your binary. 0b0001, 0b0010, etc. So, 0b1101 ^ 0b1110 would give you 0b0011 (or 3).
– Jeff
Jul 28 '15 at 23:58
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Why does Math.round(0.49999999999999994) return 1?
...s (CPU, 32- or 64-bit mode).
And, when using round or inverting matrices, etc., these bits can make a huge difference.
x64 output:
10.5 rounded is 11
10.499999999999998 rounded is 10
9.5 rounded is 10
9.499999999999998 rounded is 9
8.5 rounded is 9
8.499999999999998 rounded is 8
7.5 rounded is 8
...
How to display gpg key details without importing it?
... ACK, this is very good, doesn't require local personal keyring etc. does display the key name... works best.
– Florian Heigl
Apr 30 '17 at 16:22
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What difference is there between WebClient and HTTPWebRequest classes in .NET?
...n fact, why weren't they merged into one class (too many methods/variables etc may be one reason but there are other classes in .NET which breaks that rule).
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Handling warning for possible multiple enumeration of IEnumerable
...ave an interface that is IEnumerable + Count + Indexer, without Add/Remove etc. methods, which is what I suspect would solve this problem.
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Naming of ID columns in database tables
...ys have table alias such as "i" for inoice, p for "product" on SQL or LINQ etc.
– Cheung
Oct 13 '14 at 7:50
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Differences between Emacs and Vim
... it compared to using a GUI editor/IDE and using something like python/awk/etc for extra tasks is up to you.
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Put buttons at bottom of screen with LinearLayout?
...can control where to other layouts fit inside of it. like : layout_below , etc.
– k0sh
Mar 1 '14 at 15:54
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