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Pandas aggregate count distinct
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153
How about either of:
>>> df
date duration user_id
0 2013-04-01 30 ...
Why does Java switch on contiguous ints appear to run faster with added cases?
...ogram logic. Part of this code involves multiplying double variables by 10 raised to arbitrary non-negative int exponent s. One fast way (edit: but not the fastest possible, see Update 2 below) to get the multiplied value is to switch on the exponent :
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How do you enable the escape key close functionality in a Twitter Bootstrap modal?
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301
It looks like this is an issue with how the keyup event is being bound.
You can add the tabinde...
Count cells that contain any text
...ts not empty/blank, count it. I believe this is what you want.
=COUNTIF(A1:A10, "<>")
Otherwise you can use CountA as Scott suggests
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Python's json module, converts int dictionary keys to strings
... for the given language, are strings (or "scalars" in Perl). In perl $foo{1}, $foo{1.0}, and $foo{"1"} are all references to the same mapping in %foo --- the key is evaluated as a scalar!
JSON started as a Javascript serialization technology. (JSON stands for JavaScript Object Notation.) Naturall...
Updating MySQL primary key
...update the primary key.
alter table xx drop primary key, add primary key(k1, k2, k3);
To fix things:
create table fixit (user_2, user_1, type, timestamp, n, primary key( user_2, user_1, type) );
lock table fixit write, user_interactions u write, user_interactions write;
insert into fixit
selec...
What is the best way to programmatically detect porn images? [closed]
...he makers admit that their algorithmic image recogniser will drop the ball 15% of the time, then making fun of it when it does exactly that is silly.
But PORNsweeper only seems to live up to its stated specifications in one department - detection of actual porn. It's half-way decent at detecting por...
Where can I get a list of Ansible pre-defined variables?
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Add comma to numbers every three digits
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TreeMap sort by value
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179
You can't have the TreeMap itself sort on the values, since that defies the SortedMap specific...