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Efficiently checking if arbitrary object is NaN in Python / numpy / pandas?
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170
pandas.isnull() (also pd.isna(), in newer versions) checks for missing values in both numeric an...
How to iterate over arguments in a Bash script
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edited Nov 1 '08 at 23:52
answered Nov 1 '08 at 18:25
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Python: Tuples/dictionaries as keys, select, sort
...ies of fruits of different colors, e.g., 24 blue bananas, 12 green apples, 0 blue strawberries and so on.
I'd like to organize them in a data structure in Python that allows for easy selection and sorting. My idea was to put them into a dictionary with tuples as keys, e.g.,
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What is the formal difference in Scala between braces and parentheses, and when should they be used?
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370
I tried once to write about this, but I gave up in the end, as the rules are somewhat diffuse. B...
What do numbers using 0x notation mean?
What does a 0x prefix on a number mean?
5 Answers
5
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How do I set the version information for an existing .exe, .dll?
...set!
– twasbrillig
Nov 18 '14 at 22:09
2
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Pandas aggregate count distinct
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How about either of:
>>> df
date duration user_id
0 2013-04-01 30 0001
1 2013-04-01 15 0001
2 2013-04-01 20 0002
3 2013-04-02 15 0002
4 2013-04-02 30 0002
>>> df.groupby("date").agg({"duration": np.sum, "user_id...
How do I put two increment statements in a C++ 'for' loop?
...valuates both operands, and returns the second operand. Thus:
for(int i = 0; i != 5; ++i,++j)
do_something(i,j);
But is it really a comma operator?
Now having wrote that, a commenter suggested it was actually some special syntactic sugar in the for statement, and not a comma operator at all...
How can sbt pull dependency artifacts from git?
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answered Sep 26 '11 at 3:40
Kipton BarrosKipton Barros
19.7k33 gold badges6161 silver badges7575 bronze badges
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How to get an enum which is created in attrs.xml in code
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101
There does not seem to be an automated way to get a Java enum from an attribute enum - in Java ...