Write SDF file from bunch of mol files

Mols2SDF.py

import glob
import rdkit
from rdkit import Chem
from rdkit.Chem import AllChem
import pandas as pd
#csvs = glob.glob('CSVS/*.csv')
csvs = open('List','r').readlines()
mol_list = ['MOLS/'+m[5:-4]+'mol' for m in csvs]
#fnames = pd.read_csv('ListMols',header=None)
#fnames.columns = ['MOL'],sanitize=False,strictParsing=False
w = Chem.SDWriter('database.sdf')
#mol_array = {}
for m in mol_list:
    mol = Chem.MolFromMolFile(m,removeHs=False)
    print(m)
    if mol is not None:
        df = pd.read_csv('CSVS/'+m[5:-4]+'.csv',na_filter = False,na_values=['_'])
        mol.SetProp('OplsFF',df.to_string(index=False))
        mol.SetProp('Charge','%3.2f'%df.Q.sum())
        mol.SetProp("_Name","%s"%m)
        w.write(mol)
    else: print(m)