--- a/cheminfolib.py	Tue Jul 28 08:37:04 2020 -0400
+++ b/cheminfolib.py	Mon Oct 19 14:43:01 2020 +0000
@@ -4,31 +4,37 @@
     Copyright 2012, Bjoern Gruening and Xavier Lucas
 """
 
-import os, sys
+import glob
+import re
+import subprocess
+import sys
+import tempfile
+from multiprocessing import Pool
+
 
 try:
     from galaxy import eggs
     eggs.require('psycopg2')
-except:
+except ImportError:
+    psycopg2 = None
     print('psycopg2 is not available. It is currently used in the pgchem wrappers, that are not shipped with default CTB')
 
 try:
     from openbabel import openbabel, pybel
     openbabel.obErrorLog.StopLogging()
-except:
+except ImportError:
+    openbabel, pybel = None, None
     print('OpenBabel could not be found. A few functions are not available without OpenBabel.')
 
-from multiprocessing import Pool
-import glob, tempfile, re
-import subprocess
 
-def CountLines( path ):
+def CountLines(path):
     out = subprocess.Popen(['wc', '-l', path],
-                         stdout=subprocess.PIPE,
-                         stderr=subprocess.STDOUT
-                         ).communicate()[0]
+                           stdout=subprocess.PIPE,
+                           stderr=subprocess.STDOUT
+                           ).communicate()[0]
     return int(out.partition(b' ')[0])
 
+
 def grep(pattern, file_obj):
     grepper = re.compile(pattern)
     for line in file_obj:
@@ -36,6 +42,7 @@
             return True
     return False
 
+
 def check_filetype(filepath):
     mol = False
     possible_inchi = True
@@ -50,76 +57,78 @@
             return 'drf'
         elif possible_inchi and re.findall('^InChI=', line):
             return 'inchi'
-        elif re.findall('^M\s+END', line):
+        elif re.findall(r'^M\s+END', line):
             mol = True
         # first line is not an InChI, so it can't be an InChI file
         possible_inchi = False
 
     if mol:
-        # END can occures before $$$$, so and SDF file will 
+        # END can occures before $$$$, so and SDF file will
         # be recognised as mol, if you not using this hack'
         return 'mol'
     return 'smi'
 
+
 def db_connect(args):
     try:
-        db_conn = psycopg2.connect("dbname=%s user=%s host=%s password=%s" % (args.dbname, args.dbuser, args.dbhost, args.dbpasswd));
+        db_conn = psycopg2.connect("dbname=%s user=%s host=%s password=%s" % (args.dbname, args.dbuser, args.dbhost, args.dbpasswd))
         return db_conn
-    except:
+    except psycopg2.Error:
         sys.exit('Unable to connect to the db')
 
+
 ColumnNames = {
-    'can_smiles' : 'Canonical SMILES',
-    'can' : 'Canonical SMILES',
-    'inchi' : 'InChI',
-    'inchi_key' : 'InChI key',
-    'inchi_key_first' : 'InChI key first',
-    'inchi_key_last' : 'InChI key last',
-    'molwt' : 'Molecular weight',
-    'hbd' : 'Hydrogen-bond donors',
-    'donors' : 'Hydrogen-bond donors',
-    'hba' : 'Hydrogen-bond acceptors',
-    'acceptors' : 'Hydrogen-bond acceptors',
-    'rotbonds' : 'Rotatable bonds',
-    'logp' : 'logP',
-    'psa' : 'Polar surface area',
-    'mr' : 'Molecular refractivity',
-    'atoms' : 'Number of heavy atoms',
-    'rings' : 'Number of rings',
-    'set_bits' : 'FP2 bits',
-    'id' : 'Internal identifier',
-    'tani' : 'Tanimoto coefficient',
-    'spectrophore' : 'Spectrophores(TM)',
-    'dist_spectrophore' : 'Spectrophores(TM) distance to target',
-    'synonym' : 'Entry id',
+    'can_smiles': 'Canonical SMILES',
+    'can': 'Canonical SMILES',
+    'inchi': 'InChI',
+    'inchi_key': 'InChI key',
+    'inchi_key_first': 'InChI key first',
+    'inchi_key_last': 'InChI key last',
+    'molwt': 'Molecular weight',
+    'hbd': 'Hydrogen-bond donors',
+    'donors': 'Hydrogen-bond donors',
+    'hba': 'Hydrogen-bond acceptors',
+    'acceptors': 'Hydrogen-bond acceptors',
+    'rotbonds': 'Rotatable bonds',
+    'logp': 'logP',
+    'psa': 'Polar surface area',
+    'mr': 'Molecular refractivity',
+    'atoms': 'Number of heavy atoms',
+    'rings': 'Number of rings',
+    'set_bits': 'FP2 bits',
+    'id': 'Internal identifier',
+    'tani': 'Tanimoto coefficient',
+    'spectrophore': 'Spectrophores(TM)',
+    'dist_spectrophore': 'Spectrophores(TM) distance to target',
+    'synonym': 'Entry id',
 }
 
 OBDescriptor = {
-    'atoms': ["atoms","Number of atoms"],
-    'hatoms': ["hatoms","Number of heavy atoms"], # self defined tag hatoms in plugindefines.txt
-    'can_smiles' : ["cansmi","Canonical SMILES"],
-    'can_smilesNS' : ["cansmiNS","Canonical SMILES without isotopes or stereo"],
-    #["abonds","Number of aromatic bonds"],
-    #["bonds","Number of bonds"],
-    #["dbonds","Number of double bonds"],
-    #["formula","Chemical formula"],
-    'hba': ["HBA1","Number of Hydrogen Bond Acceptors 1 (JoelLib)"],
-    'hba2': ["HBA2","Number of Hydrogen Bond Acceptors 2 (JoelLib)"],
-    'hbd': ["HBD","Number of Hydrogen Bond Donors (JoelLib)"],
-    'inchi': ["InChI","IUPAC InChI identifier"],
-    'inchi_key': ["InChIKey","InChIKey"],
-    #["L5","Lipinski Rule of Five"],
-    'logp': ["logP","octanol/water partition coefficient"],
-    'mr': ["MR","molar refractivity"],
-    'molwt': ["MW","Molecular Weight filter"],
-    #["nF","Number of Fluorine Atoms"],
-    #["s","SMARTS filter"],
-    #["sbonds","Number of single bonds"],
-    #["smarts","SMARTS filter"],
-    #["tbonds","Number of triple bonds"],
-    #["title","For comparing a molecule's title"],
-    'psa': ["TPSA","topological polar surface area"],
-    'rotbonds' : ['ROTATABLE_BOND', 'rotatable bonds'],
+    'atoms': ["atoms", "Number of atoms"],
+    'hatoms': ["hatoms", "Number of heavy atoms"],  # self defined tag hatoms in plugindefines.txt
+    'can_smiles': ["cansmi", "Canonical SMILES"],
+    'can_smilesNS': ["cansmiNS", "Canonical SMILES without isotopes or stereo"],
+    # ["abonds", "Number of aromatic bonds"],
+    # ["bonds", "Number of bonds"],
+    # ["dbonds", "Number of double bonds"],
+    # ["formula", "Chemical formula"],
+    'hba': ["HBA1", "Number of Hydrogen Bond Acceptors 1 (JoelLib)"],
+    'hba2': ["HBA2", "Number of Hydrogen Bond Acceptors 2 (JoelLib)"],
+    'hbd': ["HBD", "Number of Hydrogen Bond Donors (JoelLib)"],
+    'inchi': ["InChI", "IUPAC InChI identifier"],
+    'inchi_key': ["InChIKey", "InChIKey"],
+    # ["L5", "Lipinski Rule of Five"],
+    'logp': ["logP", "octanol/water partition coefficient"],
+    'mr': ["MR", "molar refractivity"],
+    'molwt': ["MW", "Molecular Weight filter"],
+    # ["nF", "Number of Fluorine Atoms"],
+    # ["s", "SMARTS filter"],
+    # ["sbonds", "Number of single bonds"],
+    # ["smarts", "SMARTS filter"],
+    # ["tbonds", "Number of triple bonds"],
+    # ["title", "For comparing a molecule's title"],
+    'psa': ["TPSA", "topological polar surface area"],
+    'rotbonds': ['ROTATABLE_BOND', 'rotatable bonds'],
 }
 
 
@@ -128,9 +137,9 @@
         outfile = open(args.output, 'w')
         requested_fields = (filter(lambda x: x not in ["[", "]", "'"], args.fetch)).split(', ')
         if args.header:
-            outfile.write( 'Identifier\t' + '\t'.join( [ColumnNames[key] for key in requested_fields] ) + '\n' )
+            outfile.write('Identifier\t' + '\t'.join([ColumnNames[key] for key in requested_fields]) + '\n')
         for row in rows:
-            outfile.write( row['synonym'] + '\t' + '\t'.join( [str(row[key]) for key in requested_fields] ) + '\n' )
+            outfile.write(row['synonym'] + '\t' + '\t'.join([str(row[key]) for key in requested_fields]) + '\n')
 
     elif args.oformat in ['sdf', 'mol2']:
         outfile = pybel.Outputfile(args.oformat, args.output, overwrite=True)
@@ -139,103 +148,102 @@
                 mol = pybel.readstring('sdf', row['mol'])
                 if args.oformat == 'sdf':
                     keys = filter(lambda x: x not in ["[", "]", "'"], args.fetch).split(', ')
-                    mol.data.update( { ColumnNames['synonym'] : row['synonym'] } )
+                    mol.data.update({ColumnNames['synonym']: row['synonym']})
                     if 'inchi_key' in keys:
-                        keys = (', '.join(keys).replace( "inchi_key", "inchi_key_first, inchi_key_last" )).split(', ')
-                    [ mol.data.update( { ColumnNames[key] : row[key] } ) for key in keys if key]
+                        keys = (', '.join(keys).replace("inchi_key", "inchi_key_first, inchi_key_last")).split(', ')
+                    [mol.data.update({ColumnNames[key]: row[key]}) for key in keys if key]
                 outfile.write(mol)
-            except:
+            except OSError:
                 pass
     else:
         outfile = open(args.output, 'w')
-        outfile.write( '\n'.join( [ '%s\t%s' % (row[args.oformat], row['synonym'] ) for row in rows ] ) )
+        outfile.write('\n'.join(['%s\t%s' % (row[args.oformat], row['synonym']) for row in rows]))
     outfile.close()
 
+
 def pybel_stop_logging():
     openbabel.obErrorLog.StopLogging()
 
+
 def get_properties_ext(mol):
-
     HBD = pybel.Smarts("[!#6;!H0]")
-    HBA = pybel.Smarts("[$([$([#8,#16]);!$(*=N~O);" +
-                       "!$(*~N=O);X1,X2]),$([#7;v3;" +
-                       "!$([nH]);!$(*(-a)-a)])]"
-                      )
+    HBA = pybel.Smarts(("[$([$([#8,#16]);!$(*=N~O);"
+                        "!$(*~N=O);X1,X2]),$([#7;v3;"
+                        "!$([nH]);!$(*(-a)-a)])]"
+                        ))
     calc_desc_dict = mol.calcdesc()
 
     try:
         logp = calc_desc_dict['logP']
-    except:
+    except KeyError:
         logp = calc_desc_dict['LogP']
 
     return {"molwt": mol.molwt,
             "logp": logp,
             "donors": len(HBD.findall(mol)),
-            "acceptors": len(HBA.findall(mol)), 
+            "acceptors": len(HBA.findall(mol)),
             "psa": calc_desc_dict['TPSA'],
             "mr": calc_desc_dict['MR'],
             "rotbonds": mol.OBMol.NumRotors(),
-            "can": mol.write("can").split()[0].strip(), ### tthis one works fine for both zinc and chembl (no ZINC code added after can descriptor string)
+            "can": mol.write("can").split()[0].strip(),  # tthis one works fine for both zinc and chembl (no ZINC code added after can descriptor string)
             "inchi": mol.write("inchi").strip(),
             "inchi_key": get_inchikey(mol).strip(),
             "rings": len(mol.sssr),
             "atoms": mol.OBMol.NumHvyAtoms(),
-            "spectrophore" : OBspectrophore(mol),
-           }
+            "spectrophore": OBspectrophore(mol),
+            }
+
 
 def get_inchikey(mol):
     conv = openbabel.OBConversion()
     conv.SetInAndOutFormats("mol", "inchi")
     conv.SetOptions("K", conv.OUTOPTIONS)
-    inchikey = conv.WriteString( mol.OBMol )
+    inchikey = conv.WriteString(mol.OBMol)
     return inchikey
 
+
 def OBspectrophore(mol):
     spectrophore = pybel.ob.OBSpectrophore()
     # Parameters: rotation angle = 20, normalization for mean and sd, accuracy = 3.0 A and non-stereospecific cages.
-    spectrophore.SetNormalization( spectrophore.NormalizationTowardsZeroMeanAndUnitStd )
-    return ', '.join( [ "%.3f" % value for value in spectrophore.GetSpectrophore( mol.OBMol ) ] )
+    spectrophore.SetNormalization(spectrophore.NormalizationTowardsZeroMeanAndUnitStd)
+    return ', '.join(["%.3f" % value for value in spectrophore.GetSpectrophore(mol.OBMol)])
+
 
-def squared_euclidean_distance(a, b):
-    try:
-        return ((np.asarray( a ) - np.asarray( b ))**2).sum()
-    except ValueError:
-        return 0
-
-def split_library( lib_path, lib_format = 'sdf', package_size = None ):
+def split_library(lib_path, lib_format='sdf', package_size=None):
     """
-        Split a library of compounds. Usage: split_library( lib_path, lib_format, package_size )
-        IT currently ONLY WORKS FOR SD-Files
+    Split a library of compounds. Usage: split_library(lib_path, lib_format, package_size)
+    IT currently ONLY WORKS FOR SD-Files
     """
     pack = 1
     mol_counter = 0
 
-    outfile = open('/%s/%s_pack_%i.%s' % ( '/'.join(lib_path.split('/')[:-1]), lib_path.split('/')[-1].split('.')[0], pack, 'sdf'), 'w' )
+    outfile = open('/%s/%s_pack_%i.%s' % ('/'.join(lib_path.split('/')[:-1]), lib_path.split('/')[-1].split('.')[0], pack, 'sdf'), 'w')
 
     for line in open(lib_path, 'r'):
-        outfile.write( line )
+        outfile.write(line)
         if line.strip() == '$$$$':
             mol_counter += 1
             if mol_counter % package_size == 0:
                 outfile.close()
                 pack += 1
-                outfile = open('/%s/%s_pack_%i.%s' % ( '/'.join(lib_path.split('/')[:-1]), lib_path.split('/')[-1].split('.')[0], pack, 'sdf'), 'w' )
-                if mol_counter*10 % package_size == 0:
-                    print('%i molecules parsed, starting pack nr. %i' % ( mol_counter, pack - 1 ))
+                outfile = open('/%s/%s_pack_%i.%s' % ('/'.join(lib_path.split('/')[:-1]), lib_path.split('/')[-1].split('.')[0], pack, 'sdf'), 'w')
+                if mol_counter * 10 % package_size == 0:
+                    print('%i molecules parsed, starting pack nr. %i' % (mol_counter, pack - 1))
     outfile.close()
 
     return True
 
-def split_smi_library( smiles_file, structures_in_one_file ):
+
+def split_smi_library(smiles_file, structures_in_one_file):
     """
-        Split a file with SMILES to several files for multiprocessing usage. 
-        Usage: split_smi_library( smiles_file, 10 )
+    Split a file with SMILES to several files for multiprocessing usage.
+    Usage: split_smi_library(smiles_file, 10)
     """
     output_files = []
     tfile = tempfile.NamedTemporaryFile(delete=False)
 
     smiles_handle = open(smiles_file, 'r')
-    for count, line in enumerate( smiles_handle ):
+    for count, line in enumerate(smiles_handle):
         if count % structures_in_one_file == 0 and count != 0:
             tfile.close()
             output_files.append(tfile.name)
@@ -247,9 +255,9 @@
     return output_files
 
 
-def mp_run(input_path, regex, PROCESSES, function_to_call ):
+def mp_run(input_path, regex, PROCESSES, function_to_call):
     paths = []
-    [ paths.append(compound_file) for compound_file in glob.glob(str(input_path) + str(regex)) ]
+    [paths.append(compound_file) for compound_file in glob.glob(str(input_path) + str(regex))]
     paths.sort()
 
     pool = Pool(processes=PROCESSES)
@@ -259,6 +267,6 @@
 
     return paths
 
+
 if __name__ == '__main__':
     print(check_filetype(sys.argv[1]))
-