From c30f7c33db0947af380ccdc923e24149e7149070 2014-04-22 23:15:30
From: Jessica B. Hamrick <jhamrick@berkeley.edu>
Date: 2014-04-22 23:15:30
Subject: [PATCH] Small style fixes

---

diff --git a/IPython/nbformat/current.py b/IPython/nbformat/current.py
index 09870f1..5688e50 100644
--- a/IPython/nbformat/current.py
+++ b/IPython/nbformat/current.py
@@ -87,7 +87,7 @@ def reads_json(nbjson, **kwargs):
     nb = reader_reads(nbjson, **kwargs)
     nb_current = convert(nb, current_nbformat)
     errors = validate(nb_current)
-    if len(errors) > 0:
+    if errors:
         logger.error(
             "Notebook JSON is invalid (%d errors detected during read)",
             len(errors))
@@ -100,7 +100,7 @@ def writes_json(nb, **kwargs):
 
     """
     errors = validate(nb)
-    if len(errors) > 0:
+    if errors:
         logger.error(
             "Notebook JSON is invalid (%d errors detected during write)",
             len(errors))
diff --git a/IPython/nbformat/validator.py b/IPython/nbformat/validator.py
index e937142..e7dae33 100644
--- a/IPython/nbformat/validator.py
+++ b/IPython/nbformat/validator.py
@@ -23,7 +23,7 @@ def isvalid(nbjson):
     """
 
     errors = validate(nbjson)
-    return errors == 0
+    return errors == []
 
 
 def validate(nbjson):
@@ -42,7 +42,7 @@ def validate(nbjson):
 
     # count how many errors there are
     v = Draft3Validator(v3schema)
-    errors = [e for e in v.iter_errors(nbjson)]
+    errors = list(v.iter_errors(nbjson))
     return errors