import numpy as np # numpy's random is usualy much faster
import random

OUT_FOLDER= "./data"
LINE_COUNT=500001
CHUNK_SIZE=5000


category_list=list("ABCD")



for file_num in range(5):
    with open(OUT_FOLDER+f"/rand_{file_num}.csv","w"):
        i=0
        while i < LINE_COUNT:
           i+=min(CHUNK_SIZE, LINE_COUNT-i)
           
           numbers=np.random.random_integers(0,4)