csv - Python: renaming files returns the wrong name -

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say have folder 1000 csv files names event_1.csv, event_2.csv,..., event_1000.csv.

i in fact have 25 folders , want rename files in such way first 4 characters 0001 first folder, 0002 second, way 0025. last 4 characters represent event, such 1st event 0001, second 0002, way 1000.

so 1st file in 1st folder changed in fashion: event_1.csv = 00010001.csv.

anyway code wrong, in first 100 files in 1st folder named 00020000.csv 00020099.csv, since 0002 should used in 2nd folder only. then, 101st file last, correct filenames: 00010101.csv 00011000.csv.

this code: wrong that?

import os, sys import glob import csv  directory=r'c:\users\myname\desktop\tests' subdir=[x[0] x in os.walk(directory)] subdir.pop(0)  n=['0001','0002','0003','0004','0005','0006','0007','0008','0009','0010','0011','0012','0013','0014','0015','0016','0017','0018','0019','0020','0021','0022','0023','0024','0025']  in subdir:     n in n:         temp_dir=r''+i         os.chdir(temp_dir)         a=str(n)         file in glob.glob("*.csv"):             if len(file)==11:                 event='000'+str(file[6])                 newname=a+event                 os.rename(file, newname + '.csv')             if len(file)==12:                 event='00'+str(file[6:8])                 newname=a+event                 os.rename(file, newname + '.csv')             if len(file)==13:                 event='0'+str(file[6:9])                 newname=a+event                 os.rename(file, newname + '.csv')             if len(file)==14:                 event=file[6:10]                 newname=a+event                 os.rename(file, newname + '.csv')

if you're sure names of files, considerably simplify code (as m.t said). try maybe :

for n,i in enumerate(subdir):         os.chdir(r''+i)   # or whatever folders named         m,file in enumerate(glob.glob("*.csv")):             newname = "{0:04d}{1:04d}.csv".format(n+1,m+1)             os.rename(file, newname)

edit : it's better enumerate.


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