Using python, I want to merge on multiple variables; A, B, C, but when realization a-b-c in one dataset is missing, use the finer combination that the observation has (like b-c). Example: Suppose I have a dataset (df1) containing person’s characteristics (gender, married, city). And another dataset (df2…
Tag: merge
How to merge two dataframes and eliminate dupes
I am trying to merge two dataframes together. One has 1.5M rows and one has 15M rows. I was expecting the merged dataframe to haev 15M rows, but it actually has 178M rows!! I think my merge is doing some kind of Cartesian product, and this isn not what I want. This is what I tried, and got 178M rows.
pandas, merge duplicates if row contains wildcard text
I have a dataset of duplicates (ID). Dataset contains both information and emails. I’m trying to concatenate the emails (if row have character @) and then remove the duplicates. My original dataset: What I wish to accomplish: My current code is a modification of Eric Ed Lohmar code and give the followin…
Pandas merge 3 dataframes with same columns
I have 3 dataframes where I have one string column which I want to merge on and 2 similar columns which I want to add up df1: df2: df3: I want: df4: Answer try this, first pandas.concat then groupby
merge & write two jsonl (json lines) files into a new jsonl file in python3.6
Hello I have two jsonl files like so: one.jsonl second.jsonl And my goal is to write a new jsonl file (with encoding preserved) name merged_file.jsonl which will look like this: My approach is like this: However I am met with this error: TypeError: Object of type generator is not JSON serializable I will appr…
How to merge multiple json files into one file in python
I want to merge multiple json files into one file in python. The thing that I want to do is if there are several .json files like: The result.json files I want to get should look like: The result.json files I got is: I used the code to merge .json files from here and changed it very slightly like below:
How to merge a list composed of many variables and a DataFrame in a single Python Dataframe?
I’ve created a list named “list_data” which contains variables from many files. I also have a dataframe named “observation_data”. I’m trying to merge these 2 files with the key “time”, but nothing to do, all my tentatives fail. Here is my code and my results And…
pandas merge columns to create new column with comma separated values
My dataframe has four columns with colors. I want to combine them into one column called “Colors” and use commas to separate the values. For example, I’m trying to combine into a Colors column like this : My code is: But the output for ID 120 is: And the output for ID 121 is: FOUND MY PROBLE…
Pandas left join in place
I have a large data frame df and a small data frame df_right with 2 columns a and b. I want to do a simple left join / lookup on a without copying df. I come up with this code but I am not sure how robust it is: I know it certainly fails when there are duplicated keys: pandas
Join/Merge two Pandas dataframes and use columns as multiindex
I have two dataframes with KPIs by date. I want to combine them and use multi-index so that each KPI can be easily compared to the other for the two df. Like this: I have tried to extract each KPI into a series, rename the series accordingly (df1, df2), and then concatenating them using the keys argument of p…