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Element-wise addition of 2 lists?
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What Python version did you use for those timings?
– arshajii
Sep 16 '13 at 0:20
9
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Event system in Python
What event system for Python do you use? I'm already aware of pydispatcher , but I was wondering what else can be found, or is commonly used?
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Instance attribute attribute_name defined outside __init__
...what I'm used to with Java. However, I just discovered that when extending Python classes, the parent can see and operate on child instance variables EVEN when not passed to the parent through Super. This makes extending some classes very difficult, because the parent class will operate on the child...
What is this 'Lambda' everyone keeps speaking of?
...otos global variables.
Looking at your profile I see that you're mostly a Python user. For the above pattern, Python has the concept of decorators. There are lots of example on the net for memoization decorators. The only difference is that in Python you most likely have a named nested function ins...
Practicing BDD with python [closed]
Which are the most advanced frameworks and tools there are available for python for practicing Behavior Driven Development? Especially finding similar tools as rspec and mocha for ruby would be great.
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Extract first item of each sublist
...[1,2,3],[11,12,13],[21,22,23]]
>>> zip(*lst)[0]
(1, 11, 21)
Or, Python 3 where zip does not produce a list:
>>> list(zip(*lst))[0]
(1, 11, 21)
Or,
>>> next(zip(*lst))
(1, 11, 21)
Or, (my favorite) use numpy:
>>> import numpy as np
>>> a=np.array...
Operation on every pair of element in a list
Using Python, I'd like to compare every possible pair in a list.
4 Answers
4
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Age from birthdate in python
How can I find an age in python from today's date and a persons birthdate? The birthdate is a from a DateField in a Django model.
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“TypeError: (Integer) is not JSON serializable” when serializing JSON in Python?
I am trying to send a simple dictionary to a json file from python, but I keep getting the "TypeError: 1425 is not JSON serializable" message.
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Why does (1 in [1,0] == True) evaluate to False?
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Python actually applies comparison operator chaining here. The expression is translated to
(1 in [1, 0]) and ([1, 0] == True)
which is obviously False.
This also happens for expressions like
a < b < c
which tran...