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Tag: python-3.x

async exec in python

I’d like to call exec in an async function and do something like the following code (which is not valid): More precisely, I’d like to be able to wait for a future inside the code that runs in exec. How can this be achieved? Answer Note: F-strings are only supported in python 3.6+. For older versio…

Why isn’t my for loop working for my expression?

I want this function to read a password, and check to see if it has at least 1 number in it. If not, it needs to return False. I need to use a for loop with the range function and this is what I have: I’ve tried different variations and it’s driving me crazy. Can someone possibly explain to a

Count duplicate lists inside a list

I want the result to be 2 since number of duplicate lists are 2 in total. How do I do that? I have done something like this But the count value is 1 as it returns matched lists. How do I get the total number of duplicate lists? Answer Solution You can use collections.Counter if your sub-lists only contain num…

PyQt Label not changing text

I have this code running on a PyQt window on windows: Inside the “runSimulation” code I start a subprocess using the method “call”. This blocks my GUI and at the title of the window appears “Python stopping responding”, but if I wait a little bit the subprocess finishes nor…

Python 3.6 Module cannot be found: Folium

I am trying to import folium into a Jupyter notebook I’m working on and I cannot seem to solve the import issues with the Folium library. Has anyone else solved this problem? Output from the above yields: Answer From the source: Choose the sandbox folder of your choice (~/sandbox for example) Clone foli…

String by value; Dictionary by reference?

I’m coming from C, learning Python. In Python (3.5.2), it seems that assignment of one data type to another of the same type is sometimes done by value and sometimes by reference. For example, strings are assigned by value: This is the behavior I expect. However, it works differently with dictionaries: …

Getting TypeError: __init__() missing 1 required positional argument: ‘on_delete’ when trying to add parent table after child table with entries

I have two classes in my sqlite database, a parent table named Categorie and the child table called Article. I created first the child table class and addes entries. So first I had this: And after I have added parent table, and now my models.py looks like this: So when I run python manage.py makemigrations &l…