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Splitting a list into N parts of approximately equal length
... equal parts? For example, if the list has 7 elements and is split it into 2 parts, we want to get 3 elements in one part, and the other should have 4 elements.
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Initializing a member array in constructor initializer
...tly to fire off list initialization
struct A {
int foo[3];
A():foo{1, 2, 3} { }
A():foo({1, 2, 3}) { } /* invalid */
};
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How to merge 2 JSON objects from 2 files using jq?
...t will merge them recursively. For example,
jq -s '.[0] * .[1]' file1 file2
Important: Note the -s (--slurp) flag, which puts files in the same array.
Would get you:
{
"value1": 200,
"timestamp": 1382461861,
"value": {
"aaa": {
"value1": "v1",
"value2": "v2",
"value3...
pandas GroupBy columns with NaN (missing) values
...e 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 issue ...
how to “reimport” module to python then code be changed after import
...
For Python 2.x
reload(foo)
For Python 3.x
import importlib
import foo #import the module here, so that it can be reloaded.
importlib.reload(foo)
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How to pip install a package with min and max version range?
... install a package with both a minimum version ( pip install package>=0.2 ) and a maximum version which should never be installed (theoretical api: pip install package<0.3 ).
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How to swap keys and values in a hash
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286
Ruby has a helper method for Hash that lets you treat a Hash as if it was inverted (in essence...
How do I fetch lines before/after the grep result in bash?
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275
You can use the -B and -A to print lines before and after the match.
grep -i -B 10 'error' da...
GoTo Next Iteration in For Loop in java
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352
continue;
continue; key word would start the next iteration upon invocation
For Example
for...