From 1cc4c179822fe151b9017ba579c5a87ffed90d82 Mon Sep 17 00:00:00 2001
From: Toon Verstraelen <Toon.Verstraelen@UGent.be>
Date: Thu, 19 Jan 2017 20:19:37 +0100
Subject: [PATCH] Fix some empty line conventions pep8

---
 yaff/pes/generator.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/yaff/pes/generator.py b/yaff/pes/generator.py
index c68f4514..efd82868 100644
--- a/yaff/pes/generator.py
+++ b/yaff/pes/generator.py
@@ -524,6 +524,7 @@ def process_pars(self, pardef, conversions, nffatype, par_info=None):
             par_table[key] = [(pars,)]
         return par_table
 
+
 class PolySixGenerator(ValenceGenerator):
     nffatype = 2
     prefix = 'POLYSIX'
@@ -594,6 +595,7 @@ def get_vterm(self, pars, indexes):
         args = pars + (self.ICClass(*indexes),)
         return self.VClass(*args, sign=1.0)
 
+
 class TorsionAngleHarmGenerator(ValenceGenerator):
     nffatype = 4
     par_info = [('A', float), ('PHI0', float)]
@@ -755,6 +757,7 @@ def iter_indexes(self, system):
             if len(neighbours)==3:
                 yield neighbours[0],neighbours[1],neighbours[2],atom
 
+
 class OopCosGenerator(ValenceGenerator):
     nffatype = 4
     par_info = [('A', float)]
@@ -783,6 +786,7 @@ def get_vterm(self, pars, indexes):
         ic = OopCos(*indexes)
         return Chebychev1(pars[0], ic)
 
+
 class OopMeanCosGenerator(ValenceGenerator):
     nffatype = 4
     par_info = [('A', float)]
@@ -811,6 +815,7 @@ def get_vterm(self, pars, indexes):
         ic = OopMeanCos(*indexes)
         return Chebychev1(pars[0], ic)
 
+
 class OopDistGenerator(ValenceGenerator):
     nffatype = 4
     par_info = [('K', float), ('D0', float)]
@@ -835,6 +840,7 @@ def iter_indexes(self, system):
             if len(neighbours)==3:
                 yield neighbours[0],neighbours[1],neighbours[2],atom
 
+
 class SquareOopDistGenerator(ValenceGenerator):
     nffatype = 4
     par_info = [('K', float), ('D0', float)]
@@ -859,6 +865,7 @@ def iter_indexes(self, system):
             if len(neighbours)==3:
                 yield neighbours[0],neighbours[1],neighbours[2],atom
 
+
 class ImproperGenerator(ValenceGenerator):
     nffatype = 4
     par_info = [('M', int), ('A', float), ('PHI0', float)]
@@ -882,6 +889,7 @@ def iter_indexes(self, system):
                 for i1, i2, i3 in permutations([1,2,3]):
                     yield i1, atom, i2, i3
 
+
 class ValenceCrossGenerator(Generator):
     '''All generators for cross valence terms derive from this class.
 
@@ -993,6 +1001,7 @@ def get_indexes2(self, indexes):
         '''Get the indexes for the third internal coordinate from the whole'''
         raise NotImplementedError
 
+
 class CrossGenerator(ValenceCrossGenerator):
     prefix = 'CROSS'
     par_info = [('KSS', float), ('KBS0', float), ('KBS1', float), ('R0', float), ('R1', float), ('THETA0', float)]
@@ -1019,6 +1028,7 @@ def get_indexes1(self, indexes):
     def get_indexes2(self, indexes):
         return indexes
 
+
 class NonbondedGenerator(Generator):
     '''All generators for the non-bonding interactions derive from this class