Skip to main content

How to merge 2 dataframes on multiple columns containing duplicates

so I have 2 dataframes df1 and df2.

df1

names = ['Bob', 'Joe', '', 'Bob', '0000', 'Alice', 'Joe', 'Alice', 'Bob', '']
df1 = pd.DataFrame({'names': names,'ages': ages})

df2

names_in_student_db = [' Bob', ' Joe ', '', ' Bob ', 'Chris', 'Alice', 'Joe ', 'Alice ', ' Bob ', 'Daniel']
df2 = pd.DataFrame({'student_names': names_in_student_db,'grades': grades})

Now, I want to merge these 2 dataframes but obviously, there are 2 problems:

  1. names and names_in_student_db are not fully identical.
  2. Both of them contain duplicates — this seems to be making merge functions to throw an error. Also, duplicates in one column are not the same (meaning let's say, 1st Bob and 3rd Bob in any of these columns are not the same person), but let's say the 2nd Bob in 1st column and 2nd Bob in the 2nd column are the same person.

So how do I write a general code (not tailored for these specific dataframes) to solve this? I'm looking for outer join btw.

My guess is I could create another column in each dataframe, let's call it 'order' column which basically would be basically integers from 0 to 9. And then if I could merge dataframes based on 2 columns (I mean matching 'order1' column with 'order2' and 'names' with 'student_names'). Is that possible? I think that still throws a duplicate-related error though.



source https://stackoverflow.com/questions/71916586/how-to-merge-2-dataframes-on-multiple-columns-containing-duplicates
Labels:

Comments

Post a Comment

Popular posts from this blog

How to show number of registered users in Laravel based on usertype?

i'm trying to display data from the database in the admin dashboard i used this: <?php use Illuminate\Support\Facades\DB; $users = DB::table('users')->count(); echo $users; ?> and i have successfully get the correct data from the database but what if i want to display a specific data for example in this user table there is "usertype" that specify if the user is normal user or admin i want to user the same code above but to display a specific usertype i tried this: <?php use Illuminate\Support\Facades\DB; $users = DB::table('users')->count()->WHERE usertype =admin; echo $users; ?> but it didn't work, what am i doing wrong? source https://stackoverflow.com/questions/68199726/how-to-show-number-of-registered-users-in-laravel-based-on-usertype
Post a Comment
Read more

Why is my reports service not connecting?

I am trying to pull some data from a Postgres database using Node.js and node-postures but I can't figure out why my service isn't connecting. my routes/index.js file: const express = require('express'); const router = express.Router(); const ordersCountController = require('../controllers/ordersCountController'); const ordersController = require('../controllers/ordersController'); const weeklyReportsController = require('../controllers/weeklyReportsController'); router.get('/orders_count', ordersCountController); router.get('/orders', ordersController); router.get('/weekly_reports', weeklyReportsController); module.exports = router; My controllers/weeklyReportsController.js file: const weeklyReportsService = require('../services/weeklyReportsService'); const weeklyReportsController = async (req, res) => { try { const data = await weeklyReportsService; res.json({data}) console...
Post a Comment
Read more

How to split a rinex file if I need 24 hours data

Trying to divide rinex file using the command gfzrnx but getting this error. While doing that getting this error msg 'gfzrnx' is not recognized as an internal or external command Trying to split rinex file using the command gfzrnx. also install'gfzrnx'. my doubt is I need to run this program in 'gfzrnx' or in 'cmdprompt'. I am expecting a rinex file with 24 hrs or 1 day data.I Have 48 hrs data in RINEX format. Please help me to solve this issue. source https://stackoverflow.com/questions/75385367/how-to-split-a-rinex-file-if-i-need-24-hours-data
Post a Comment
Read more