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How do I select elements of an array given condition?
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@ru111 It works on Python 3.6 too (there is no reason for it to stop working).
– jfs
Dec 7 '17 at 20:13
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Large, persistent DataFrame in pandas
I am exploring switching to python and pandas as a long-time SAS user.
6 Answers
6
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Using Emacs as an IDE
...npages, info manuals, and Elisp documentation from within emacs
Looking up Python documentation from within Emacs.
Google searching will no doubt reveal further examples.
As the second link shows, looking up functions (and whatever) in other documentation can be done, even if not supported out ...
Pandas every nth row
...es a row/column slice, both based on integer position and following normal python syntax.
df.iloc[::5, :]
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How can I get the current screen orientation?
...tween what to load in portrait vs. landscape. I already have a layout-land xml that is handling my layout.
9 Answers
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Hide all warnings in ipython
I need to produce a screencast of an ipython session, and to avoid confusing viewers, I want to disable all warnings emitted by warnings.warn calls from different packages. Is there a way to configure the ipythonrc file to automatically disable all such warnings?
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Creating dataframe from a dictionary where entries have different lengths
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In Python 3.x:
import pandas as pd
import numpy as np
d = dict( A = np.array([1,2]), B = np.array([1,2,3,4]) )
pd.DataFrame(dict([ (k,pd.Series(v)) for k,v in d.items() ]))
Out[7]:
A B
0 1 1
1 2 2
2 NaN 3
3 N...
`elif` in list comprehension conditionals
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Python's conditional expressions were designed exactly for this sort of use-case:
>>> l = [1, 2, 3, 4, 5]
>>> ['yes' if v == 1 else 'no' if v == 2 else 'idle' for v in l]
['yes', 'no', 'idle', 'idle', 'idle'...
Converting a Pandas GroupBy output from Series to DataFrame
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Is this also true in Python 3? I'm finding a groupby function returning the pandas.core.groupby.DataFrameGroupBy object, not pandas.core.frame.DataFrame.
– Adrian Keister
Sep 10 '18 at 17:31
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How to write to an existing excel file without overwriting data (using pandas)?
...'engine')
writer = pd.ExcelWriter(filename, engine='openpyxl')
# Python 2.x: define [FileNotFoundError] exception if it doesn't exist
try:
FileNotFoundError
except NameError:
FileNotFoundError = IOError
try:
# try to open an existing workbook
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