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How to convert index of a pandas dataframe into a column?
This seems rather obvious, but I can't seem to figure out how to convert an index of data frame to a column?
7 Answers
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SQL query to group by day
...
actually this depends on what DBMS you are using but in regular SQL convert(varchar,DateColumn,101) will change the DATETIME format to date (one day)
so:
SELECT
sum(amount)
FROM
sales
GROUP BY
convert(varchar,created,101)
the magix number 101 is what date format it is con...
setuptools vs. distutils: why is distutils still a thing?
...t's one reason. The following is straight from the NumPy setup.py:
if len(sys.argv) >= 2 and ('--help' in sys.argv[1:] or
sys.argv[1] in ('--help-commands', 'egg_info', '--version',
'clean')):
# Use setuptools for these commands (they don't work well or at all...
Convert pandas timezone-aware DateTimeIndex to naive timestamp, but in certain timezone
...DateTimeIndex timezone aware, but how can you do the opposite: how can you convert a timezone aware Timestamp to a naive one, while preserving its timezone?
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List all the modules that are part of a python package?
...ol for this job is pkgutil.walk_packages.
To list all the modules on your system:
import pkgutil
for importer, modname, ispkg in pkgutil.walk_packages(path=None, onerror=lambda x: None):
print(modname)
Be aware that walk_packages imports all subpackages, but not submodules.
If you wish to l...
Extension methods must be defined in a non-generic static class
... Beware that you may get this compiler if you inadvertently converted your class to an extension method (according to the compiler). See this answer with regards to static methods and this answer with regards to this method arguments.
– Maarten Bodewes
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OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
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Unless there is some other requirement not specified, I would simply convert your color image to grayscale and work with that only (no need to work on the 3 channels, the contrast present is too high already). Also, unless there is some specific problem regarding resizing, I would work with a ...
How to get the ASCII value of a character
...ion ord() would get the int value
of the char. And in case you want to
convert back after playing with the
number, function chr() does the trick.
>>> ord('a')
97
>>> chr(97)
'a'
>>> chr(ord('a') + 3)
'd'
>>>
In Python 2, there is also the unichr function...
Exif manipulation library for python [closed]
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Use PIL :)
import os,sys
from PIL import Image
from PIL.ExifTags import TAGS
if __name__ == '__main__':
for (k,v) in Image.open(sys.argv[1])._getexif().iteritems():
print '%s = %s' % (TAGS.get(k), v)
os.system('pause')
...
Simple way to convert datarow array to datatable
I want to convert a DataRow array into DataTable ... What is the simplest way to do this?
14 Answers
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