rename_csv

import os
import sys
import csv

print('Hey')

def modify(name, n):
    return name+'_'+str(n)

def rename(old, new, suffix=None):
    from os import rename as os_rename
    from os.path import exists
    if suffix:
        old, new = [name+'.'+suffix for name in (old, new)]
    if exists(old) : os_rename(old, new)

memory = {}
for old, new in reader:
    memory[new] = memory.setdefault(new, -1) + 1
    if memory[new]:
         new = modify(new, memory[new])
         memory[new] = 0

def rename_files(csv_filename):
    with open('rename_csv.csv', 'r') as csvfile:
        csvreader = csv.reader(csvfile, delimiter=',', quotechar='"')

        files_mapping = {}
        new_filenames = set()

        for row in csvreader:
            #!  add ' ' + before row[n] if files accidentally have space in front of int.
            name = row[0] + '.wav'
            new = row[1] + '.wav'

            if new in new_filenames:
                raise Exception(
                    'Found duplicate filename {} for file {}'.format(new, name)
                )

            new_filenames.add(new)
            files_mapping['name'] = new

        for name, new in files_mapping.items():
            if os.path.exists(name):
                print('\n' + 'renaming ' + name)
                os.rename(name, new)
                
            else:
                print('\n' + name + " does not exist")



if __name__ == "__main__":
    rename_files(sys.argv[1])