TypeError: 'NoneType' object is not an iterator Rdkit VS code - visual-studio-code

Question

I'm trying to filter molecules from database 'part1' via Lipinski,Ghose and RUle of 3 filter but I keep getting error.
So, after I ran this script, I get an error 'object is not an iterator' at the line where 'progressbar' is mentioned twice. I'm new and would appreciate help.
Below is my script for filtering database of molecules.
from rdkit import Chem
from rdkit.Chem import Descriptors
import progressbar
if __name__ == '__main__':
molecules = Chem.SDMolSupplier('chemspidersdf/part1.sdf')
results = {
"Lipinski Rule of 5": 0,
"Ghose Filter": 0,
"Rule of 3 Filter": 0,
}
print ("Molecule Database Length: " + str(len(molecules)))
for i in progressbar.ProgressBar(range(len(molecules))):
molecule = molecules[i]
if molecule:
lipinski = False
rule_of_3 = False
ghose_filter = False
molecular_weight = Descriptors.ExactMolWt(molecule)
logp = Descriptors.MolLogP(molecule)
h_bond_donor = Descriptors.NumHDonors(molecule)
h_bond_acceptors = Descriptors.NumHAcceptors(molecule)
rotatable_bonds = Descriptors.NumRotatableBonds(molecule)
number_of_atoms = Chem.rdchem.Mol.GetNumAtoms(molecule)
molar_refractivity = Chem.Crippen.MolMR(molecule)
# Lipinski
if molecular_weight <= 500 and logp <= 5 and h_bond_donor <= 5 and h_bond_acceptors <= 5 and rotatable_bonds <= 5:
lipinski = True
results["Lipinski Rule of 5"] += 1
# Ghose Filter
if molecular_weight >= 160 and molecular_weight <= 480 and logp >= 0.4 and logp <= 5.6 and number_of_atoms >= 20 and number_of_atoms <= 70 and molar_refractivity >= 40 and molar_refractivity <= 130:
ghose_filter = True
results["Ghose Filter"] += 1
# Rule of 3
if molecular_weight <= 300 and logp <= 3 and h_bond_donor <= 3 and h_bond_acceptors <= 3 and rotatable_bonds <= 3:
rule_of_3 = True
results["Rule of 3 Filter"] += 1
print (results)

Answer 1

I assume you are using progressbar2. Looks like progressbar should be lowercase:
mols = Chem.SDMolSupplier('path/to/my/mols.sdf')
n_mols = len(mols)
for x in progressbar.progressbar(range(n_mols)):
# do stuff...
It also works like this:
mols = Chem.SDMolSupplier('path/to/my/mols.sdf')
for mol in progressbar.progressbar(mols):
if mol is None:
continue
# do stuff...