How to execute a function asynchronously every 60 seconds in Python?
I want to execute a function every 60 seconds on Python but I don’t want to be blocked meanwhile.
Python
django – convert a list back to a queryset
I have a handful of records that I would like to sort based on a computed value. Got the answer over here… like so: sorted(Profile.objects.all(), key=lambda p: p.reputation) on a Profile class like this: class Profile(models.Model): … @property def reputation(self): … Unfortunately the generic view is expecting a queryset object and throws an error if … Read more
Nested list comprehensions
I tried to use the value of an outer list comprehension in an inner one:
What does “lambda” mean in Python, and what’s the simplest way to use it?
Can you give an example and other examples that show when and when not to use Lambda?
My book gives me examples, but they’re confusing.
Qt and opencv app not working in virtual environment
I created a GUI app using pyqt5 and opencv. The app works fine without activating the virtual env but when I activate the virtual env and run the app it shows this error:
Setting values on a copy of a slice from a DataFrame
A value is trying to be set on a copy of a slice from a DataFrame. Try
using .loc[row_indexer,col_indexer] = value instead
Unicode identifiers in Python?
I want to build a Python function that calculates,
Tkinter: invoke event in main loop
How do you invoke a tkinter event from a separate object?
Is this the way to validate Django model fields?
As I understand it, when one creates a Django application, data is validated by the form before it’s inserted into a model instance which is then written to the database. But if I want to create an additional layer of protection at the data model layer, is what I’ve done below the current “best practice?” I’m trying to ensure that a reviewer’s name cannot be omitted nor be left blank. Should I be putting any custom validation in the ‘clean’ method as I’ve done here and then have ‘save’ call ‘full_clean” which calls ‘clean’? If not, what’s the preferred method? Thanks.
Write opencv frames into gstreamer rtsp server pipeline
I’m trying to put opencv images into a gstreamer rtsp server in python.
I have some issue writing in the mediafactory, I’m new to gst-rtsp-server ancd there’s little documentation so I don’t know exactly if I’m using the right approach. I’m using a thread to start the MainLoop and I’m using the main thread to create a buffer to push in the appsrc element of the mediafactory pipeline. Am I using the right approach to obtain my objective? Can anyone help me? My code is below: