Fix Pydatalab incompatibilities between Py2/3 (#367)

* Upgrading httplib2 to version 0.10.3.

The 0.9.2 version does not work with Python 3.

* Fix Pydatalab incompatibilities between Py2/3.

These all have to do with bytes/string differences.

* str() only takes one arg in py2.

* Fix build breaks.

Author: chmeyers

google/datalab/storage/commands/_storage.py

@@ -367,7 +367,9 @@ def _gcs_view(args, _):
   contents = _get_object_contents(args['object'])
   if not isinstance(contents, basestring):
     contents = str(contents)
-  lines = contents.split('\n')
+  elif isinstance(contents, bytes):
+    contents = str(contents, encoding='UTF-8')
+  lines = contents.splitlines()
   head_count = args['head']
   tail_count = args['tail']
   if len(lines) > head_count + tail_count:

google/datalab/utils/_http.py

@@ -43,7 +43,10 @@ def __init__(self, status, content):
     self.message = 'HTTP request failed'
     # Try extract a message from the body; swallow possible resulting ValueErrors and KeyErrors.
     try:
-      error = json.loads(content)['error']
+      if type(content) == str:
+        error = json.loads(content)['error']
+      else:
+        error = json.loads(str(content, encoding='UTF-8'))['error']
       if 'errors' in error:
         error = error['errors'][0]
       self.message += ': ' + error['message']