import py3Dmol
from rdkit import Chem
from rdkit.Chem import AllChem
from ipywidgets import interact

@interact
def show_molecule(smiles=''):
    if not smiles:
        return
    mol = Chem.MolFromSmiles(smiles)
    display(mol)
    if not mol:
        return
    mol = Chem.AddHs(mol)
    AllChem.EmbedMolecule(mol)
    AllChem.MMFFOptimizeMolecule(mol)
    Chem.MolToMolBlock(mol, kekulize=False)
...