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How to insert element into arrays at specific position?
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23 Answers
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Find indices of elements equal to zero in a NumPy array
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numpy.where() is my favorite.
>>> x = numpy.array([1,0,2,0,3,0,4,5,6,7,8])
>>> numpy.where(x == 0)[0]
array([1, 3, 5])
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Operation on every pair of element in a list
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233
Check out product() in the itertools module. It does exactly what you describe.
import iterto...
Numpy where function multiple conditions
...e values, then a and b returns b. So saying something like [0,1,2] and [2,3,4] will just give you [2,3,4]. Here it is in action:
In [230]: dists = np.arange(0,10,.5)
In [231]: r = 5
In [232]: dr = 1
In [233]: np.where(dists >= r)
Out[233]: (array([10, 11, 12, 13, 14, 15, 16, 17, 18, 19]),)
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How to get all subsets of a set? (powerset)
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137
The Python itertools page has exactly a powerset recipe for this:
from itertools import chain,...
pandas: filter rows of DataFrame with operator chaining
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398
I'm not entirely sure what you want, and your last line of code does not help either, but anyw...
Are tuples more efficient than lists in Python?
...s much faster than assigning a list.
>>> def a():
... x=[1,2,3,4,5]
... y=x[2]
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>>> def b():
... x=(1,2,3,4,5)
... y=x[2]
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>>> import dis
>>> dis.dis(a)
2 0 LOAD_CONST 1 (1)
3 LOAD_CONST ...
Is it worth using Python's re.compile?
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TriptychTriptych
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How to pad zeroes to a string?
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Strings:
>>> n = '4'
>>> print(n.zfill(3))
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And for numbers:
>>> n = 4
>>> print(f'{n:03}') # Preferred method, python >= 3.6
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>>> print('%03d' % n)
004
>>> print(format(n, '03')) # python >= 2.6
004
>>> ...
How can I check which version of Angular I'm using?
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Kabb5
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answered Apr 15 '13 at 14:35
TheHippoTheHippo...