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What is the difference between join and merge in Pandas?
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I always use join on indices:
import pandas as pd
left = pd.DataFrame({'key': ['foo', 'bar'], 'val': [1, 2]}).set_index('key')
right = pd.DataFrame({'key': ['foo', 'bar'], 'val': [4, 5]}).set_index('key')
left.join(right, lsuffix='_l', rsuffix='_r')
val_l ...
How can I color Python logging output?
...put, presumably because of its log system (because all the messages were standardized).
30 Answers
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Bulk insert with SQLAlchemy ORM
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I tried this with sqlachemy 1.0.11 and it still makes 3 insert statements. But it is a lot faster than normal orm operations.
– zidarsk8
Oct 7 '16 at 21:12
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Define css class in django Forms
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Yet another solution that doesn't require changes in python code and so is better for designers and one-off presentational changes: django-widget-tweaks. Hope somebody will find it useful.
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How to find list of possible words from a letter matrix [Boggle Solver]
...ictionary word that could be a solution must use only the grid's
# letters and have length >= 3. (With a case-insensitive match.)
import re
alphabet = ''.join(set(''.join(grid)))
bogglable = re.compile('[' + alphabet + ']{3,}$', re.I).match
words = set(word.rstrip('\n') for word in open('words')...
How to calculate a time difference in C++
... Careful: This won't work if the user changes his time between Timer() and the call to elapsed() if !std::chrono::high_resolution_clock::is_steady - which is the case on Linux!
– jhasse
Feb 9 '18 at 12:33
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Method Resolution Order (MRO) in new-style classes?
...lasses to demonstrate how methods are resolved in classic resolution order and
how is it different with the new order.
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Should you always favor xrange() over range()?
...might prefer range():
In python 3, range() does what xrange() used to do and xrange() does not exist. If you want to write code that will run on both Python 2 and Python 3, you can't use xrange().
range() can actually be faster in some cases - eg. if iterating over the same sequence multiple time...
What's a good way to extend Error in JavaScript?
I want to throw some things in my JS code and I want them to be instanceof Error, but I also want to have them be something else.
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How do you run a Python script as a service in Windows?
...e which provides a higher level interface for operations on these objects, and the other programs to access the objects through that service.
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