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python pandas: Remove duplicates by columns A, keeping the row with the highest value in column B
...]: df.drop_duplicates(subset='A', keep="last")
Out[10]:
A B
1 1 20
3 2 40
4 3 10
You can do also something like:
In [12]: df.groupby('A', group_keys=False).apply(lambda x: x.loc[x.B.idxmax()])
Out[12]:
A B
A
1 1 20
2 2 40
3 3 10
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Convert NSDate to NSString
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edited Feb 25 '19 at 13:17
Sunil Targe
6,39755 gold badges3939 silver badges7070 bronze badges
answe...
@Transactional(propagation=Propagation.REQUIRED)
...(as you would expect it to).
http://static.springsource.org/spring/docs/3.1.x/spring-framework-reference/html/transaction.html
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How to order results with findBy() in Doctrine
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Checking images for similarity with OpenCV
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This is a huge topic, with answers from 3 lines of code to entire research magazines.
I will outline the most common such techniques and their results.
Comparing histograms
One of the simplest & fastest methods. Proposed decades ago as a means to find picture s...
Convert a list to a dictionary in Python
....
from itertools import izip
i = iter(a)
b = dict(izip(i, i))
In Python 3 you could also use a dict comprehension, but ironically I think the simplest way to do it will be with range() and len(), which would normally be a code smell.
b = {a[i]: a[i+1] for i in range(0, len(a), 2)}
So the iter(...
Post JSON using Python Requests
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1123
As of Requests version 2.4.2 and onwards, you can alternatively use 'json' parameter in the call...
Chrome browser reload options new feature
... do it I get these three awesome options.
1. Normal Reload
2. Hard Reload
3. Empty Cache and Hard Reload (this is very useful option I believe)
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Auto-loading lib files in Rails 4
...zers/require.rb:
require "#{Rails.root}/lib/extensions"
P.S.
Rails 3 Autoload Modules/Classes by Bill Harding.
And to understand what does Rails exactly do about auto-loading?
read Rails autoloading — how it works, and when it doesn't by Simon Coffey.
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