I have a pandas dataframe which looks like this: The type of column Time is datetime64[ns, pytz.FixedOffset(60)](1), float64(7), int64(1), frequency of this column is 2H. I now want to extend the dataframe by new dates in order to get a dataframe like this one: Answer This function should do the work. As para…
Tag: pandas
Why does a string cause entire pandas DataFrame to be non-numerical?
If I create a pandas DataFrame using numerical values, this is reflected in the DataFrame. However, if the first element is a string, i.e. ‘a’, the entire DataFrame goes grey and all numbers in it are converted to strings, i.e. 3 becomes ‘3’. Why and how to retain datatype diversity? T…
How to get a specific value from a pivot table – python
How do I get a specific value from a pivot table? I need to store “imdb_score” as a int in a variable. how can I do this? this is the the contents of the table: Answer set the index to the unique column you have in dataframe which you want to use to filter.
How can you get rolling value count (frequency) with Pandas? (computationally efficient, no loops)
I have a list of values and I want to get their rolling frequency, so something like this: Of course I can do this with a loop but with a lot of data it can be computationally expensive so I’d much rather use a built-in or something vectorized, etc. But unfortunately, from my searching, there doesn̵…
How to drop entire group in pandas if any other columns meet certain criteria?
I have a df that looks like this: Currently, I am using this line of code to filter on the df so that only rows that are of a period PRE and have an amount of more than 10 are included: What I realized though is that I actually need to remove the entire grouping from the df if even
How to assign an item in a pandas dataframe after checking for conditions?
I am iterating through a pandas dataframe (originally a csv file) and checking for specific keywords in each row of a certain column. If it appears at least once, I add 1 to a score. There are like 7 keywords, and if the score is >=6, I would like to assign an item of another column (but in this row)
Balance dataset using pandas
This is for a machine learning program. I am working with a dataset that has a csv which contains an id, for a .tif image in another directory, and a label, 1 or 0. There are 220,025 rows in the csv. I have loaded this csv as a pandas dataframe. Currently in the dataframe, there are 220,025 rows, with 130,908
Finding regex patterns regardless of spaces
There are strings (which are rows of a pandas data frame): 2.5807003.49 9/2020 24,54 4.7103181.69 9 /2020 172,05 4.7197189.46 09/2020 172,0 5 4.7861901.25 9/2020 8 9,16 2.5807003.49 10/2020 35,65 4.7103181.69 10/2020 185,50 4.7197189.46 1 0/2020 185,5 0 4.7861901.25 10/2020 94 ,32 What I need is to extract th…
Transpose specific rows into columns in pandas
I have a dataset that has information like below: I want to convert this piece of data to this form: How can I convert my data frame to this form ?? I am not getting what should I do in this case. Answer Try with
Resampling timestamps in a CSV
I have a CSV file that stores data from different smartphone sensors. The timestamps are elapsed nanoseconds since the program to record the data was started. Short example: The time steps between the timestamps are not equal, but I would like them to be. My question is how to achieve this? I was thinking abo…