Python
ImportError: No module named cv2
In here, I have installed numpy and opencv in my windows operating system. But i can’t find out the proper way to add cv2 modu
OverflowError: (34, ‘Result too large’)
Python floats are neither arbitary precision nor of unlimited size. When k = 349, 16.**k is much too large – that’s almost 2^1400. Fortunately, the decimal library allows arbitrary precision and can handle the size:
Get a random sample with replacement
I have this list: and I want to get 4 random letters from it, but including repetition. Running this will only give me 4 unique letters, but never any repeating letters: How do I get a list of 4 colors, with repeating letters possible?
TypeError: expected string or buffer
I have this simple code: I don’t know why I am getting the error: ‘expected string or buffer’ Can anyone help?
Call Python function from JavaScript code
All you need is to make an ajax request to your pythoncode. You can do this with jquery http://api.jquery.com/jQuery.ajax/, or use just javascript
BeautifulSoup and lxml.html – what to prefer?
The simple answer, imo, is that if you trust your source to be well-formed, go with the lxml solution. Otherwise, BeautifulSoup all the way. Edit: This answer is three years old now; it’s worth noting, as Jonathan Vanasco does in the comments, that BeautifulSoup4 now supports using lxml as the internal parser, so you can … Read more
Using numpy to build an array of all combinations of two arrays
In newer version of numpy (>1.8.x), numpy.meshgrid() provides a much faster implementation: @pv’s solution numpy.meshgrid() use to be 2D only, now it is capable of ND. In this case, 3D: Note that the order of the final resultant is slightly different.
numpy-equivalent of list.pop?
Is there a numpy method which is equivalent to the builtin pop for python lists? Popping obviously doesn’t work on numpy arrays, and I want to avoid a list conversion
Pandas split DataFrame by column value
You can use boolean indexing: It’s also possible to invert mask by ~: