merging on pandas: reduce the set of merging variables when match is not possible

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 …

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 …

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: …

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 apprecite your hint/help in any ways. Thank you! I have looked other SO repos, they are all writing normal json files, which should work in my case too, but its keep failing. Reading single file like this works: Answer It is possible that extract_json returns a generator

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 …

In Pandas, how to delete rows from a Data Frame based on another Data Frame?

I have 2 Data Frames, one named USERS and another named EXCLUDE. Both of them have a field named “email”. Basically, I want to remove every row in USERS that has an email contained in EXCLUDE. How …

How to merge two dataframe in pandas to replace nan

I want to do this in pandas: I have 2 dataframes, A and B, I want to replace only NaN of A with B values. A 2014-04-17 12:59:00 146.06250 146.0625 …