[FIXED] Combine big data stored in subdirectories as 100,000+ CSV files of size 200 GB with Python

Issue

I want to create an algorithm to extract data from csv files in different folders / subfolders. each folder will have 9000 csvs. and we will have 12 of them. 12*9000. over 100,000 files

Solution

This is working solution for over 100,000 files

Credits : Abhishek Thakur - https://twitter.com/abhi1thakur/status/1358794466283388934

import pandas as pd
import glob 
import time

    start = time.time()
    
    path = 'csv_test/data/'
    all_files = glob.glob(path + "/*.csv")
    l = []
    
    for filename in all_files:
      df = pd.read_csv(filename, index_col=None, header = 0)
      l.append(df)
    
    frame = pd.concat(l, axis = 0, ignore_index = True)
    frame.to_csv('output.csv', index = False)
    
    end = time.time()
    print(end - start)

not sure if it can handle data of size 200 gb. - need feedback regarding this

Answered By - Avneesh Chaudhary