I need to: Create a df that looks like this: items y y y item z z z item z z z item z z z The first column is named [‘items’] for convenience because the rows created under this custom index will do so based on changing variable item. It will be passed into the items column to create
Tuple comparison in function
I am wondering why my comparison returns False and not True although ‘a’ == ‘a’. Output: False Answer It’s because you are using *values rather than values in your function definition When you use the special syntax *args in a function, args will already come back as a tuple, whe…
networkx.exception.NetworkXError: Node 64 has no position
i am getting the error in the title, there are already some questions similar to this but none of theme seems to be working for me. this is my code in python: basically, i’m trying to draw a randomGraph in NetworkX, in the code above randomGraphis a dictionary, with the keys being all the edges and the …
Timestamp of Outlook emails using Python
Is it possible to use Python to extract timestamps from received email? I’m using the following code but to no avail: I only get one date published repeatedly for each email. (i.e., 2021-11-22, 2021-11-22, 2021-11-22…….) Any help will be much appreciated. Answer Well, of course – you o…
How to get the ID of a XML element in a QTreeWidget and insert a new element into it
I inserted a XML file into the QTreeWidget view and I want to get the id of the selected directory in the tree and insert a new XML element (directory) into it. What the XML-file basically looks like: …
How do you remove a range of rows in a python ndarray matrix?
Suppose I have a 100×100 matrix in Python like below: You can see A below: How do I delete a range of rows (like rows 5 – 50) in A? Answer create a mask array of the elements you want to keep and then just index the array. Code: Shape before: Shape after:
Solving linear equation of complex matrices
I have a linear equation of a form ax=b where b is a complex matrix, and a is a real matrix. I’m expecting solution x to be a complex vector. When trying the numpy.linalg.solve(a,b) function, I’m getting this warning: ComplexWarning: Casting complex values to real discards the imaginary part How d…
SSL connect to mysql from django
We just had a migration from a “unsecured” mysql DB to a SSL mysql but my Django application cannot connect anymore. content of settings.py and when I execute this Django command line : python3 manage.py dbshell (which used to work with the pre-migration DB), I receive the error message : As you c…
error 1064 (42000) : You have an error in your SQL syntax near to use %s
I dont know what I done wrong, but the error is : error 1064 (42000) : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘%s’ I made this code above in my code : This code is working. So idk why this code
How to prevent alembic revision –autogenerate from making revision file if it has not detected any changes?
I have project where I’m using SQLAlchemy for models and I’m trying to integrate Alembic for making migrations. Everything works as expected when I change models and Alembic sees that models have changed -> it creates good migration file with command: alembic revision –autogenerate -m …