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How to add an empty column to a dataframe?
What's the easiest way to add an empty column to a pandas DataFrame object? The best I've stumbled upon is something like
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How to get first element in a list of tuples?
I have a list like below where the first element is the id and the other is a string:
12 Answers
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Converting a Pandas GroupBy output from Series to DataFrame
...taFrame. It has a hierarchical index, though:
In [19]: type(g1)
Out[19]: pandas.core.frame.DataFrame
In [20]: g1.index
Out[20]:
MultiIndex([('Alice', 'Seattle'), ('Bob', 'Seattle'), ('Mallory', 'Portland'),
('Mallory', 'Seattle')], dtype=object)
Perhaps you want something like this?
In ...
How do you test running time of VBA code?
... class, call it CTimer say, then you can make an instance somewhere global and just call .StartCounter and .TimeElapsed
Option Explicit
Private Type LARGE_INTEGER
lowpart As Long
highpart As Long
End Type
Private Declare Function QueryPerformanceCounter Lib "kernel32" (lpPerformanceCount ...
Backwards migration with Django South
Ok, so this seems like a really silly thing to ask, and I'm sure I'm missing something somewhere.
3 Answers
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Django import error - no module named django.conf.urls.defaults
... party app, graphite. The issue has been fixed in graphite's master branch and version 0.9.14+.
In Django 1.8+ you can remove patterns from the import, and use a list of url()s instead.
from django.conf.urls import url, include
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Convert between UIImage and Base64 string
Does anyone know how to convert a UIImage to a Base64 string, and then reverse it?
24 Answers
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Stop handler.postDelayed()
I call multiple Handlers by new Handler().postDelayed(new Runnable().....
How can I stop it when I click on back?
4 Answer...
Why does `True == False is False` evaluate to False? [duplicate]
...comparison, so
True == False is False
is equivalent to
(True == False) and (False is False)
This can be surprising in this case, but lets you write 1 <= x < 4 unlike in other languages like C.
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How do servlets work? Instantiation, sessions, shared variables and multithreading
...ervlets. For information passing among those servlets I am setting session and instance variables.
8 Answers
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