Class RigidSegmentAnnotator

BaseAnnotator.BaseAnnotator --+    
                              |    
  BaseAnnotator.SingleAnnotator --+
                                  |
                                 RigidSegmentAnnotator

Determine the number of rigid segments.  
That is, the number of segments partititioned by rotatable bonds.
Rotatable bonds defined in OEChem as:
   A single, non-ring bond between two non-terminal, non-triple-bonded atoms. 
   An atom is considered non-terminal if it is connected to two or more non-hydrogen atoms, 
   i.e. OEAtomBase::GetHvyDegree >= 2. 

>>> annotator = RigidSegmentAnnotator();
>>> smilesList = [];
>>> smilesList.append("c1ccccc1O");
>>> smilesList.append("OC(C)N");
>>> smilesList.append("COCN(C)C");
>>> smilesList.append("C1OCNCO1");
>>> smilesList.append("C1OC(C)NCO1");
>>> smilesList.append("C1O[C@H](C)NCO1");
>>> smilesList.append("OC=CN");
>>> smilesList.append("OC=C");
>>> smilesList.append("OC=COC");
>>> smilesList.append("c1ccccc1c2ccccc2");
>>> smilesList.append("C1CCCCC1C2CCCCC2");
>>> smilesList.append("CCCCCCCCCCCC");
>>> smilesList.append("CCC(CCC)CCC(CC)C");
>>> for smiles in smilesList:
...     print "%s %d" % (smiles, callBySmiles(annotator, smiles)[0]);
...
c1ccccc1O 1
OC(C)N 1
COCN(C)C 2
C1OCNCO1 1
C1OC(C)NCO1 1
C1O[C@H](C)NCO1 1
OC=CN 1
OC=C 1
OC=COC 2
c1ccccc1c2ccccc2 2
C1CCCCC1C2CCCCC2 2
CCCCCCCCCCCC 6
CCC(CCC)CCC(CC)C 5