make changes PEP-8 compliant

examples/graphviz/example_with_submodules/example_with_submodules.py

@@ -1,6 +1,7 @@
 from submodule_one import SubmoduleOne
 from submodule_two import SubmoduleTwo
 
+
 def main():
     s1 = SubmoduleOne()
     s1.report()

examples/graphviz/example_with_submodules/submodule_two.py

@@ -1,5 +1,6 @@
 from helpers import helper
 
+
 class SubmoduleTwo(object):
     def __init__(self):
         self.two = 2

pycallgraph/grouper.py

@@ -4,8 +4,8 @@ class Grouper(object):
     '''Group module names.
 
     By default, objects are grouped by their top-level module name. Additional
-    groups can be specified with the groups list and all objects will be matched
-    against it.
+    groups can be specified with the groups list and all objects will be
+    matched against it.
     '''
 
     def __init__(self, groups=None):