Python: Can a function return an array and a variable?
It’s not ignoring the values returned, you aren’t assigning them to variables.
Python
Good ways to “expand” a numpy ndarray?
There are the index tricks r_ and c_. If this is performance critical code, you might prefer to use the equivalent np.concatenate rather than the index tricks. There are also np.resize and np.ndarray.resize, but they have some limitations (due to the way numpy lays out data in memory) so read the docstring on those ones. … Read more
Python: ValueError: Mixing iteration and read methods would lose data
Once you iterate pdf_file by enumerate you cannot iterate it again except invoking pdb_file.seek(0) seek(0) changes the stream position to the beginning Here’s my modification:
Python Subprocess: Too Many Open Files
I guess the problem was due to the fact that I was processing an open file with subprocess: Here the cmd variable contain the name of a file that has just been created but not closed. Then the subprocess.Popen calls a system command on that file. After doing this for many times, the program crashed … Read more
How to create a density plot in matplotlib?
Sven has shown how to use the class gaussian_kde from Scipy, but you will notice that it doesn’t look quite like what you generated with R. This is because gaussian_kde tries to infer the bandwidth automatically. You can play with the bandwidth in a way by changing the function covariance_factor of the gaussian_kde class. First, … Read more
bbox_to_anchor and loc in matplotlib
When bbox_to_anchor and loc are used together, the loc argument will inform matplotlib which part of the bounding box of the legend should be placed at the arguments of bbox_to_anchor. For example (I’ve simplified the command a bit), the three options below will produce different locations for your legend, The first command will put the … Read more
How to get a value from a cell of a dataframe?
If you have a DataFrame with only one row, then access the first (only) row as a Series using iloc, and then the value using the column name:
ImportError: No module named ‘cv2’ Python3
Try to get the cv2. I’m not sure when opencv-python became available. I’d been building opencv by hand, but when I looked a few weeks ago, there it was. I’m using cv2 with Python3 in a VM that’s running ubuntu/trusty64.
How to install PyGame on Python 3.4?
You can install the wheel file for Python 3.4 here: First you have to install the wheel package from pip then install Pygame. Here’s a video to help you install pip on Youtube.