I don’t really see the need, as a module with functions (and not a class) would serve well as a singleton. All its variables would be bound to the module, which could not be instantiated repeatedly anyway. If you do wish to use a class, there is no way of creating private classes or private … Read more
You have the wrong mental model for using NumPy efficiently. NumPy arrays are stored in contiguous blocks of memory. If you want to add rows or columns to an existing array, the entire array needs to be copied to a new block of memory, creating gaps for the new elements to be stored. This is … Read more
There are specific libraries (like this one here) but maybe something very simple would do: Note: progressbar2 is a fork of progressbar which hasn’t been maintained in years.
Here’s a trick to force imdb.load_data to allow pickle by, in your notebook, replacing this line: by this:
**: exponentiation ^: exclusive-or (bitwise) %: modulus //: divide with integral result (discard remainder)
Sure. A for loop.
If you only have one reference to a string and you concatenate another string to the end, CPython now special cases this and tries to extend the string in place. The end result is that the operation is amortized O(n). e.g. used to be O(n^2), but now it is O(n). From the source (bytesobject.c): It’s … Read more
It used to be a required part of a package (old, pre-3.3 “regular package”, not newer 3.3+ “namespace package”). Here’s the documentation. Python defines two types of packages, regular packages and namespace packages. Regular packages are traditional packages as they existed in Python 3.2 and earlier. A regular package is typically implemented as a directory … Read more
How can I merge two Python dictionaries in a single expression? For dictionaries x and y, z becomes a shallowly-merged dictionary with values from y replacing those from x. In Python 3.9.0 or greater (released 17 October 2020): PEP-584, discussed here, was implemented and provides the simplest method: z = x | y # NOTE: … Read more
Your install is failing because you don’t have the python development headers installed. You can do this through apt on ubuntu/debian with: for python3 use: For eventlet you might also need the libevent libraries installed so if you get an error talking about that you can install libevent with: