returned dictionary value is 'None' python
Question: I have a function in a file which I am calling in a separate script (as shown
below). Printing directly from the function works correctly, however when I
try to return the value to the script it sends 'None'.

Any help would be appreciated. Thanks

script:

    
    
    import modules.functions as f
    
    restype = 'THR'
    atomtype = 'CA'
    
    print f.AtomType(restype,atomtype)
    

function: (this is the part of the function which returns the value)

    
    
    def AtomType(resName,atomType):
        def threonine():
            print 'well im here'
            atoms = {'N' : 1,
                     'CA': 6,
                     'C' : 8,
                     'O' : 2,
                     'CB': 6,
                     'OG1': 1,
                     'CG2': 4, 
                     }    
    
                print atoms[atomType]
                return atoms[atomType]
    
        residues = {'ALA' : hydrophobic,
                    'ARG' : arginine,
                    'ASN' : asparagine,
                    'ASP' : aspartate,
                    'CYS' : cysteine,
                    'GLN' : glutamine,
                    'GLU' : glutamate,
                    'GLY' : hydrophobic,
                    'HIS' : histidine,
                    'ILE' : hydrophobic,
                    'LEU' : hydrophobic,
                    'LYS' : lysine,
                    'MET' : methionine,
                    'PHE' : phenylalanine,
                    'PRO' : proline,
                    'SER' : serine,
                    'THR' : threonine,
                    'TRP' : tryptophan,
                    'TYR' : tyrosine,
                    'VAL' : hydrophobic,
                    }
    
        residues[resName]()
    

and the output I get is:

    
    
    well im here
    6
    None
    

edit: added entire function


Answer: Here's a guess: `AtomType` calls `threonine`, but doesn't return its return
value.

