I need an algorithm that can compare two text files and highlight their difference and ( even better!) can compute their difference in a meaningful way (like two similar files should have a similarity score higher than two dissimilar files, with the word “similar” defined in the normal terms). It …
Tag: python
Drag and drop onto Python script in Windows Explorer
I would like to drag and drop my data file onto a Python script and have it process the file and generate output. The Python script accepts the name of the data file as a command-line parameter, but Windows Explorer doesn’t allow the script to be a drop target. Is there some kind of configuration that n…
Is there an easy way to populate SlugField from CharField?
Is there a built-in way to get the slug field to autopopulate based on the title? Perhaps in the Admin and outside of the Admin. Answer for Admin in Django 1.0 and up, you’d need to use in your admin.py Your key in the prepopulated_fields dictionary is the field you want filled, and the value is a tuple…
How to read the RGB value of a given pixel in Python?
If I open an image with open(“image.jpg”), how can I get the RGB values of a pixel assuming I have the coordinates of the pixel? Then, how can I do the reverse of this? Starting with a blank graphic, ‘write’ a pixel with a certain RGB value? I would prefer if I didn’t have to dow…
Showing the stack trace from a running Python application
I have this Python application that gets stuck from time to time and I can’t find out where. Is there any way to signal Python interpreter to show you the exact code that’s running? Some kind of on-the-fly stacktrace? Related questions: Print current call stack from a method in Python code Check w…
Python Date Comparisons
I would like to find out if a particular python datetime object is older than X hours or minutes. I am trying to do something similar to: This generates a type error. What is the proper way to do date time comparison in python? I already looked at WorkingWithTime which is close but not exactly what I want. I …
SVG rendering in a PyGame application. Prior to Pygame 2.0, Pygame did not support SVG. Then how did you load it?
In a pyGame application, I would like to render resolution-free GUI widgets described in SVG. How can I achieve this? (I like the OCEMP GUI toolkit but it seems to be bitmap dependent for its rendering) Answer This is a complete example which combines hints by other people here. It should render a file called…
How do I generate all permutations of a list?
How do I generate all the permutations of a list? For example: Answer Use itertools.permutations from the standard library: Adapted from here is a demonstration of how itertools.permutations might be implemented: A couple of alternative approaches are listed in the documentation of itertools.permutations. Her…
How do I execute a program or call a system command?
How do I call an external command within Python as if I had typed it in a shell or command prompt? Answer Use the subprocess module in the standard library: The advantage of subprocess.run over os.system is that it is more flexible (you can get the stdout, stderr, the “real” status code, better er…
Is there a benefit to defining a class inside another class in Python?
What I’m talking about here are nested classes. Essentially, I have two classes that I’m modeling. A DownloadManager class and a DownloadThread class. The obvious OOP concept here is composition. However, composition doesn’t necessarily mean nesting, right? I have code that looks something l…