I have two different DataFrames that look something like this: Lat Lon 28.13 -87.62 28.12 -87.65 …… …… Calculated_Dist_m 34.5 101.7 ………….. The first DataFrame (name=df) (consisting of the Lat and Lon columns) has just over 1000 rows (values) in it. The second Da…
Tag: python
Fastest way to transform a continuous string of hex into base 10 in Python
I have a 100M 3600 character length strings of hexadecimal digits that I want to split into blocks of three and then convert into base 10. Strictly speaking, I want to transform these into signed 4 byte numbers. As I have 100M of these strings to process, my main aim is code efficiency/speed. For splitting th…
Fastapi app: empty array or TypeError: Boolean value of this clause is not defined
So, Im doing simple todo-api app with fastapi and sqlmodel. Migrations went fine, but if I run my server, I dont see anything except empy array. I added some data in db file with DB Browser for SQLite, so it isn’t empty. And when I run my server and go to “/”, I see only empty array and no d…
vlookup in pandas python
I have two dataframes I want to check if a column from first dataframe contains values that are in the column of second dataframe, and if it does, create a column and add 1 to the row where it contains a value from first column first df: A header Another header First apple Second orange third banana fourth te…
Unable to scrape jpg images link from json
I’m trying to scrape jpg images from each products, every product url saved in csv. Image links are available in json data so try to access json key value. When I try to run code it’s only getting back with all key value in spite of image url link, and second my code only able to scrape last produ…
How to take sample of data from very unbalanced DataFrame so as to not lose too many ‘1’?
I have a Pandas DataFrame like below with ID and Target variable (for machine learning model). My DataFrame is really large and unbalanced. I need to make sampling on my DataFrame because it is really large Balancing the DataFrame looks like this: 99.60% – 0 0.40 % – 1 ID TARGET 111 1 222 1 333 0 …
Get latest item date where item field_1 & item field_2 have duplicates
I’m using Django 4.0, and Python 3.8. I have a product that has a modification date, department name and designation. I want to retrieve each product but, for products that have the same designation and the same department, I only want to retrieve the last entry. Here is what i have now: I tried sorting…
Formatting todays date in python as date type
I’m trying to get todays date in the format %d/%m/%y without converting to a string. I still want to have the date as the data type. Following code returns an str Answer This is the right way to achieve your goal: Output: To change the date class default format: mydatetime.py Read More: How to globally …
How to combine multiple rows into one row WITHOUT group by in Python Pandas?
I tried searching it on stack overflow, and I got a lot of similar titles but the problem isn’t quite the same (it appears very different). Also, read some of the documentation (not all from Pandas) but couldn’t find any method to do this. Suppose I have a dataframe like: How do I combine this int…
How to use a polars column with offset string to add to another date column
Suppose you have and you want to make a new column that adds the hour and min offsets to the date column. The only thing I saw was the dt.offset_by method. I made an extra column and then tried but that doesn’t work because dt.offset_by only takes a fixed string, not another column. What’s the bes…