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Converting a list to a set changes element order
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113
A set is an unordered data structure, so it does not preserve the insertion order.
This depends...
Callback functions in C++
...pe.
X.2 "Calling" a callback refers to the syntax to call those objects.
X.3 "Using" a callback means the syntax when passing arguments to a function using a callback.
Note: As of C++17, a call like f(...) can be written as std::invoke(f, ...) which also handles the pointer to member case.
1. Fun...
Comparing strings with == which are declared final in Java
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232
When you declare a String (which is immutable) variable as final, and initialize it with a comp...
How to overcome TypeError: unhashable type: 'list'
...else:
d[key] = [value]
print d
# {'AAA': ['111', '112'], 'AAC': ['123'], 'AAB': ['111']}
Note that if you are using Python 3.x, you'll have to make a minor adjustment to get it work properly. If you open the file with rb, you'll need to use line = line.split(b'x') (which makes sure you are ...
What does the “at” (@) symbol do in Python?
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331
An @ symbol at the beginning of a line is used for class, function and method decorators.
Rea...
Looping over a list in Python
...with sublists in it. I want to print all the sublists with length equal to 3.
4 Answers
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How to avoid reinstalling packages when building Docker image for Python projects?
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143
Try to build a Dockerfile which looks something like this:
FROM my/base
WORKDIR /srv
ADD ./requ...
Test if lists share any items in python
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322
Short answer: use not set(a).isdisjoint(b), it's generally the fastest.
There are four common...
What is the equivalent of MATLAB's repmat in NumPy
...h multiple dimensions and gives a similar result to matlab. (Numpy gives a 3d output array as you would expect - matlab for some reason gives 2d output - but the content is the same).
Matlab:
>> repmat([1;1],[1,1,1])
ans =
1
1
Python:
In [46]: a = np.array([[1],[1]])
In [47]: n...