I wrote this code to extract multiple pages of data from this site (base URL – “https://www.goodreads.com/shelf/show/fiction”). But it’s only showing the first 50 books’ data. How can I extract all fiction books’ names extracting all pages using beautifulsoup? Answer You ca…
Tag: python
Django: Create a superuser in a data migration
Goal: automatically creating a superuser I’m trying to create a default user, specifically a superuser, in an early data migration, so whenever my Django application is run in my Docker container, it already has a superuser with which I can access the admin site. I had already tried different options fo…
Re Regular expression operations, remove periods?
I’m working with a function I made to split this sample line below to remove the standalone numerical values (123), however it’s also removing the trailing numbers which I need. I also can’t figure out how to remove the “0.0” ABC/0.0/123/TT1/1TT// What’s coming out now is b…
How to access particular elements of a dataframe in Pandas. Gives error
I have a dataframe df_params. It contains parameters for the stored procedure. I simply want to access the elements of the dataframe in a loop: But it gives me an error without really explanation: The goal is to supply value to the stored procedure: desired outcome from print(query): Answer pandas.DataFrames …
List iteration with substitution into one-liner
I want to turn the following for loop: into a one liner. I figured I could do something like this: but I need to update the value of x0 in each instance of the loop. Any ideas? Answer Walrus operator := to the rescue:
Merge inside the merge only if the first doesn’t return a match
I have 3 dataframes (df1, df2 & df3), the main one (df1) and two additional ones which contain 1 column amongst others that I want to bring over to the main dataframe. Sample dfs: df1 df2 and df3 I am using the following code: Then for the two empty strings for the “Objective” column I want to…
Gurobi – Is there a way to access the lazy constraints pool?
I have searched through all Gurobi’s PDF documentation and could not find what I am searching. I would like to know if there is a way to access the lazy constraints pool in Gurobi during the search? In a MIP_NODE, during a callback at an integer node, GRB_CB_MIPSOL, I need to access all the previously g…
SQLAlchemy Multitype columns – Hybrid Property querying
I have several tables in my PostgreSQL database that need to contain timeseries like information in an IoT-link context, that require several data types supported for the value of each point in the series, like this: I need to parse an incoming model from a REST API that has a single value field which can be …
pandas groupby() and pivot_table() .style.format() from float to currency for specific column
I’ve got a Pandas DataFrame looking like this: yields this result: now doing the same groupby but with an added aggregate like count results in: What I would like to have is a result like this: I tried variations of these: but they only reformatted the sum column Answer What you have is a column MultiIn…
Save Dataframe changes to the same xlsx file using pandas (append)
Trying to save changes to the same xlsx file without overwriting it, What I use to read the file This has overwritten my file According to Pandas team the following could be used https://github.com/pandas-dev/pandas/blob/main/pandas/io/excel/_base.py#L800-L814 If someone could guide me through this I would be…