Join two tables on ID where table one has duplicates and table two does not Question: I have two tables, Table A[‘id’, ‘col1’] and Table B[‘id’, ‘col3’]. Table A has duplicate values in ‘id’ column and its important that those duplicate row stay as they are but Table B has single pair for ‘id’ and …
How to resolve TypeError: sequence item 1: expected str instance, int found (Python)? Question: Seeking for your assistance regarding this issue and I’m trying to resolve it, tried so many syntax but still getting the same error. I got multiple csv files to be converted and I’m pulling the same data, the script works for …
How to perform split/merge/melt with Python and polars? Question: I have a data transformation problem where the original data consists of "blocks" of three rows of data, where the first row denotes a ‘parent’ and the two others are related children. A minimum working example looks like this: import polars as pl df_original = pl.DataFrame( …
Uppercase every other word in a string using split/join Question: I have a string: string = "Hello World" That needs changing to: "hello WORLD" Using only split and join in Python. Any help? string = "Hello World" split_str = string.split() Can’t then work out how to get first word to lowercase second word to uppercase …
python – Joining two columns pandas – returning NA if any value is NA, however need to return real join Question: I have dataframe: df = pd.DataFrame({‘student_id’: [71, 63, 23], ‘student_name’: [nan, ‘Peter Andrews’, ‘Amy Powers’], }) I am creating new column column which joins id + name using df[‘student_id_name’] = df[‘student_id’].astype(str) + ‘ ‘ …
Does DolphinDB have an equivalent method to Python join? Question: In Python, I can join all elements into a string separated by a string separator with method join(). >>> ‘,’.join(["{}D".format(i) for i in range(1,6)]) ‘1D,2D,3D,4D,5D’ How can I implement the function equivalent to join in DolphinDB? Asked By: ajldfa || Source Answers: You may try …
Why does my list have extra double brackets? Question: arr_list = [] arr = [‘5’, ‘6’, ‘2’, ‘4’, ‘+’] arr_list.append([”.join(arr[0:4])]) print(arr_list) Ouput: [[‘5624′]] Why does the output have 2 sets of square brackets? I only want one. Thanks in advnace. Asked By: Benjamin McDowell || Source Answers: Use: arr_list.append(”.join(arr[0:4])) Answered By: brenodacosta You’re appending a …
How to join second elements in tuples using group by first element python Question: I have a list of tuples a = [(‘name’, ‘color’),(‘fruit’, ‘color’),(‘thing’, ‘type’),(‘sport’, ‘type’)] I want to join first elements grouped by second element. The output should look like. a = [(‘name fruit’, ‘color’),(‘thing sport’, ‘type’)] Asked By: Anonymous || Source Answers: …
How to join two columns (one is list other is integer id column ) in pandas python in one dataframe? Question: I want to join these two columns in a new Dataframe like this: Asked By: Faisal Fida || Source Answers: join and explode: out = (df_id.join(df_cast[‘Cast’].str.split(‘,s*’)) .explode(‘Cast’) ) Or explode and join: out = …
Appending a large amount of columns into 1 column Question: I have a dataset of ~700 columns. I’d like to join all columns into a single column. Input: id | A | B | C | D | E | F | … | Z 0 | yes | no | yes | no | …
