I am trying to get a composite index working between a polymorphic subclass and it’s parent. Alembic autogenerate does not seem to detect Indexes outside of __table_args__. I can’t use __table_args__ because, being in the subclass, it does not count my class as having a __table__. How do I create …
Tag: python
How to write a function to find clients that are gone, boomeranging, new, etc?
I am trying to come up with a dynamic way to check for the existence of a string and report back a few different results: gone_client, boomerang, new_client. If I groupby address_id and my_date, and the pattern is Verizon, Verizon, Comcast, Comcast, the client left Verizon and went to another company. If the …
Django: Perform GROUP BY over a view queryset
I need to perform group by over a queryset of objects already filtered by standard django filters in order to filter by how many objects in queryset are related to same foreign key object. My code now (does not work): If I filtered over all objects, I could have used but how can I do the same thing with Query…
Why does pybind fail for functions without arguments?
I have an overloaded constructor in C++ (default + other). My automatically generated pybind code looks like this: When I delete the first constructor everything works fine. But for the first one I get this error: Does anyone know why this error is coming up and how to fix it? Edit: I am using a custom pybind…
Turn List of Dictionaries into Dictionary of Dictionaries with index
I have a list of dictionaries, like this: Which produces this: What I want is a dictionary of dictionaries where each dictionary is indexed like the following: The additional problem is that I need to convert the former to the latter, rather than adapting my sample creation code, as I just spent 15 hours down…
Luminance Correction (Prospective Correction)
When I was searching internet for an algorithm to correct luminance I came across this article about prospective correction and retrospective correction. I’m mostly interested in the prospective correction. Basically we take pictures of the scene with image in it(original one), and two other ,one bright…
How to count frequencies per datetime and category in python
I have a following problem. I need to count uziv_id per 10 minute interval and per expedice. I try this: But I got an error ValueError: No axis named exp for object type DataFrame. What do I do wrong please? Answer Use list [] in groupby:
How to put db name into query using %s
I have a following sql query: The tableA is in db-jablonec so I need to call db-jablonec.tableA. I use this method in Python: I call it like this: But I got an error MySQLdb.ProgrammingError: (1146, “Table ”db-jablonec’.tableA’ doesn’t exist”) Obviously, I want to call R…
Append the following x bytes to a new file when searching for string in a file
I have a large file with hex data inside listed as such “0A 04 64 72 BD 03…” My goal is to search for a specific string in the file “BA 1B 65 01” in example, once the string has been found then it copies the next 20 bytes followed after the search index and appends it to a new
How to read values from multiple sheets in excel with openpyxl
I have two sheets in one excel file. And I want to read the two values from the two excel sheets. SO I try it like this: But it only returns one value from one sheet. And not the two values from the two sheets. My question is: how to return the two values from the two sheets? Answer You