Don't parse resid, since we don't do anything with it anyway and it is not...

Don't parse resid, since we don't do anything with it anyway and it is not required to be an integer.

wrappers/python/simtk/openmm/app/charmmcrdfiles.py

@@ -47,7 +47,7 @@ ONE_TIMESCALE = 1 / TIMESCALE
 class CharmmCrdFile(object):
     """
     Reads and parses a CHARMM coordinate file (.crd) into its components,
-    namely the coordinates, CHARMM atom types, resid, resname, etc.
+    namely the coordinates, CHARMM atom types, resname, etc.
 
     Attributes
     ----------
@@ -69,7 +69,6 @@ class CharmmCrdFile(object):
         self.atomno = []                   # Atom number
         self.resno = []                    # Residue number
         self.resname = []                  # Residue name
-        self.resid = []                    # Residue ID
         self.attype = []                   # Atom type
         self.positions = []                # 3N atomic coordinates
         self.title = []                    # .crd file title block
@@ -105,7 +104,7 @@ class CharmmCrdFile(object):
             try:
                 self.natom = int(line.strip().split()[0])
     
-                for row in range(self.natom):
+                for _ in range(self.natom):
                     line = crdfile.readline().strip().split()
                     self.atomno.append(int(line[0]))
                     self.resno.append(int(line[1]))
@@ -114,7 +113,6 @@ class CharmmCrdFile(object):
                     pos = Vec3(float(line[4]), float(line[5]), float(line[6]))
                     self.positions.append(pos)
                     self.segid.append(line[7])
-                    self.resid.append(int(line[8]))
                     self.weighting.append(float(line[9]))
     
                 if self.natom != len(self.positions):
@@ -124,7 +122,7 @@ class CharmmCrdFile(object):
                                            len(self.positions))
                     )
     
-            except (ValueError, IndexError) as e:
+            except (ValueError, IndexError):
                 raise CharmmFileError('Error parsing CHARMM coordinate file')
 
         # Apply units to the positions now. Do it this way to allow for