Normal way: Aliased approach: How does one accomplish aliasing in Python? The reason I want to do this is to reduce cluttering due to long variable names. It’s a multi threaded environment, so simply copying to a local variable will not work. Answer The solution to this is to use getter and setter metho…
Tag: python
Read/Write NetworkX Graph Object
I am trying to deal with a super-massive NetworkX Graph object with hundreds of millions of nodes. I’d like to be able to write it to file as to not consume all my computer memory. However, I need to constantly be searching across existing nodes, updating edges, etc. Is there a good solution for this? I…
Opening and reading a file with askopenfilename
I have the following code where I’m trying to allow the user to open a text file and once the user has selected it, I would like the code to read it (this isn’t a finished block of code, just to show what I’m after). However, I’m having difficulties either using tkFileDialog.askopenfil…
Do I understand os.walk right?
The loop for root, dir, file in os.walk(startdir) works through these steps? get root of start dir : C:dir1dir2startdir get folders in C:dir1dir2startdir and return list of folders “dirlist” get files in the first dirlist item and return the list of files “filelist” as the first item o…
Python, converting a list of indices to slices
So I have a list of indices, and want to convert it to this, this will run on a large number of indices. Also, this technically isn’t for slices in python, the tool I am working with is faster when given a range compared to when given the individual ids. The pattern is based on being in a range, like
Multi line string with arguments. How to declare?
Let’s say I have an extremely long string with arguments that I want to create. I know you can create a multiline string with But now lets say I want to pass 1, 2, and 3 as arguments. This works But if I have a super long string with 30+ arguments, how can I possibly pass those arguments in multiple
Python Logging (function name, file name, line number) using a single file
I am trying to learn how an application works. And for this I am inserting debug commands as the first line of each function’s body with the goal of logging the function’s name as well as the line number (within the code) where I send a message to the log output. Finally, since this application co…
How to convert a NumPy array to PIL image applying matplotlib colormap
I have a simple problem, but I cannot find a good solution to it. I want to take a NumPy 2D array which represents a grayscale image, and convert it to an RGB PIL image while applying some of the matplotlib colormaps. I can get a reasonable PNG output by using the pyplot.figure.figimage command: Although I co…
Plot Ellipse with matplotlib.pyplot (Python)
Sorry if this is a stupid question, but is there an easy way to plot an ellipse with matplotlib.pyplot in Python? I was hoping there would be something similar to matplotlib.pyplot.arrow, but I can’t find anything. Is the only way to do it using matplotlib.patches with draw_artist or something similar? …
In python, how can I check if a filename ends in ‘.html’ or ‘_files’?
In python, how can I check if a filename ends in ‘.html’ or ‘_files’? Answer You probably want to know if a file name ends in these strings, not the file istelf: To test whether a file ends in one of these strings, you can do this: