Make example applications pep8 compliant. (#553)

* Test examples for pep8 compliance.

* Make rl_pong example pep8 compliant.

* Make policy gradient example pep8 compliant.

* Make lbfgs example pep8 compliant.

* Make hyperopt example pep8 compliant.

* Make a3c example pep8 compliant.

* Make evolution strategies example pep8 compliant.

* Make resnet example pep8 compliant.

* Fix.

examples/a3c/misc.py

@@ -2,28 +2,32 @@ from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
 
-import numpy as np 
 from datetime import datetime
-import cProfile, pstats, io
+import cProfile
+import io
+import pstats
+
 
 def timestamp():
-    return datetime.now().timestamp()
+  return datetime.now().timestamp()
+
 
 def time_string():
-    return datetime.now().strftime("%Y%m%d_%H_%M_%f")
+  return datetime.now().strftime("%Y%m%d_%H_%M_%f")
+
 
 class Profiler(object):
-    def __init__(self):
-        self.pr = cProfile.Profile()
-        pass
+  def __init__(self):
+    self.pr = cProfile.Profile()
+    pass
 
-    def __enter__(self):
-        self.pr.enable()
+  def __enter__(self):
+    self.pr.enable()
 
-    def __exit__(self ,type, value, traceback):
-        self.pr.disable()
-        s = io.StringIO()
-        sortby = 'cumtime'
-        ps = pstats.Stats(self.pr, stream=s).sort_stats(sortby)
-        ps.print_stats(.2)
-        print(s.getvalue())
+  def __exit__(self, type, value, traceback):
+    self.pr.disable()
+    s = io.StringIO()
+    sortby = "cumtime"
+    ps = pstats.Stats(self.pr, stream=s).sort_stats(sortby)
+    ps.print_stats(.2)
+    print(s.getvalue())