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pandas GroupBy columns with NaN (missing) values
...ng the groupby (e.g. -1):
In [11]: df.fillna(-1)
Out[11]:
a b
0 1 4
1 2 -1
2 3 6
In [12]: df.fillna(-1).groupby('b').sum()
Out[12]:
a
b
-1 2
4 1
6 3
That said, this feels pretty awful hack... perhaps there should be an option to include NaN in groupby (see this github i...
Node.js EACCES error when listening on most ports
...e, processes running without root privileges cannot bind to ports below 1024.
So try a higher port, or run with elevated privileges via sudo. You can downgrade privileges after you have bound to the low port using process.setgid and process.setuid.
Running on heroku
When running your apps on her...
Test whether a glob has any matches in bash
...
edited Sep 22 '18 at 15:34
answered Dec 10 '15 at 6:36
Bri...
How can I add an element after another element?
...
4 Answers
4
Active
...
Temporarily disable auto_now / auto_now_add
...ell.
– imjustmatthew
Jul 2 '13 at 2:42
3
from Django documentation: docs.djangoproject.com/en/1.9...
Make sure that the controller has a parameterless public constructor error
... |
edited Aug 11 '14 at 11:30
answered Jun 17 '14 at 6:31
...
Why do we need C Unions?
...nt i;
float f;
} u;
// Convert floating-point bits to integer:
u.f = 3.14159f;
printf("As integer: %08x\n", u.i);
Although this is technically undefined behavior according to the C standard (you're only supposed to read the field which was most recently written), it will act in a well-defined m...
Is it possible to style a select box? [closed]
...
45
I've seen some jQuery plugins out there that convert <select>'s to <ol>'s and <o...