I want to get subset of my dataframe if date is before 2022-04-22. The original df is like below df: I checked data type by df.dtypes and it told me ‘date’ column is ‘object’. So I checked individual cell using df[‘date’][0] and it is datetime.date(2022, 4, 21). Also, df[&#…
Tag: dataframe
How to extract ids and rows only if a column has all of the designated values
I have the following dataframe I want to group by id and keep those ids if it contains all of the designated values (i.e. 2019Q4, 2020Q4, 2021Q4) then extract rows that correspond to those values. isin() won’t work because it won’t drop C and D. desired output Answer You can use set operations to …
How to create dictionary from multiple dataframes?
I have a folder with several csv files. Example of the dataframes from csv files in directory: I need to make a function that accepts route to file directory and return sites frequency dictionary (one for all sites in file directory) with unique sites names the following kind: {‘site_string’: [sit…
Combine multiple dataframes wit pandas
I use the following script to measure the average RGB color of the picture in a selected path. I tried to make 1 dataframe with pd.concat but it doesn’t work out. This is the result that I get: But I want just 1 dataframe with one average like this: Answer Use:
Using .withColumn on all remaining columns in DF
I want to anonymize or replace almost all columns in a pyspark dataframe except a few ones. I know its possible to do something like: However, doing this for all columns is a tedious process. I would rather want to do something along the lines of this: This does however not seem to work. Is there other work a…
Split column to multiple columns by another column value (complicated separator)
I have dataframe like: len of column1 value may be different – from 2 to 5 words, so split with space not an option. Output should be like: That topic – How to split a dataframe string column into two columns? – didn’t help coz of separator UPD. Left “side” may have 2-5 wor…
How can I combine different dataframes into one csv in Python?
I have 2 dataframes with different columns. And I want to combine those into 1 csv file. Both headers should be included and there shouldn’t be empty value if columns aren’t matched. I tried to use pd.concat, but I need the result to be like below: Answer You can do this using Pandas to_csv and se…
How to turn a pandas DataFrame of lists of numbers into a 3-dimensional array?
I have a pandas DataFrame with a structure like this: (to build it, do something like What would be the simplest way to turn it into a NumPy 3-dimensional array? This would be the expected result: I have tried several things, without success: Answer One option is to convert df to a list; then cast to numpy ar…
Converting integer values to week (year-week format)
I am trying to convert one of the dataframes I have to year-week format to use it in my time series modeling, but I am not sure how would I be able to do this? Here is my code: Output- Desired O/p in week column should be in date time format. The datatype was an int in the 1st dataframe,
Checking overlaps between two columns of datetime type in Pandas DataFrame
I have a dataframe with two columns that are datetime objects (time_a and time_b). I need to check on a row-by-row basis if the elements of time_a or time_b for such row, are contained within any of the other intervals defined by the other time_a and time_b rows. That’s what I defined as ‘overlap&…