I’m planning to rename several models in an existing Django project where there are many other models that have foreign key relationships to the models I would like to rename. I’m fairly certain this will require multiple migrations, but I’m not sure of the exact procedure. Let’s say I…
Tag: python
How to grab a desktop screenshot with PyQt?
Can I take a screenshot from desktop or any window with PyQt? How to handle keyPressEvent on desktop? Thanks. Answer Example of how to take a screenshot of the desktop: If you want to take a screenshot of a specific window, replace QApplication.desktop() with the widget you want to take a screenshot of.
How to print the filename returned by askopenfilename?
As the codes show, I wanted to print the file name. It printed this line How can I just get the filename with its extension? e.g “Tonight.mp3” Answer Exclude the call to open: If you want only the filename (excluding directory path), use os.path.basename:
find and update a value of a dictionary in list of dictionaries
How can I find the dictionary with value user7 then update it’s match_sum eg add 3 to the existing 4. I have this, and am not sure if its the best practice to do it. Answer You can also use next(): prints: Note that if default (second argument) is not specified while calling next(), it would raise StopI…
I am getting the error ‘redefined-outer-name’
When running my lint, I am getting the error below: Here is my snippet of code in that line: Answer That happens because you have a local name identical to a global name. The local name takes precedence, of course, but it hides the global name, makes it inaccesible, and cause confusion to the reader. Solution…
check if .one() is empty sqlAlchemy
I am running a query based off of other ids for the query. The problem i have is that sometimes the query won’t find a result. Instead of having the entire program crash, how can I check to see if the result will be None? This is the query I have: When the code gets executed and no results are
Extracting url from style: background-url: with beautifulsoup and without regex?
I have: I want to get the url, however I don’t know how to do that without the use of regex. Is it even possible? so far my solution with regex is: Answer You could try using the cssutils package. Something like this should work: Although you are ultimately going to need to parse out the actual url this…
How to disable selection highlighting in a QTableWidget
I have a QTableWidget with a disabled setSelectionMode (QTableWidget::NoSelection) and the QTableWidgetItems I fill in don’t have the Qt::ItemIsEditable flag. Nevertheless, a cell that has been clicked gets some kind of cursor (the black line at the bottom in my case): How can I disable this “curs…
get table columns from sqlAlchemy table model
I have a table where I would like to fetch all the column names however after browsing the interwebs I could not find a way that works. This is what my table looks like: I would like to be able to print all the column names from a for loop. ex: This is pretty easy with regular sql but I
How to reverse an int in python?
I’m creating a python script which prints out the whole song of ’99 bottles of beer’, but reversed. The only thing I cannot reverse is the numbers, being integers, not strings. This is my full script, I understand my reverse function takes a string as an argument, however I do not know how t…