Py3 exception logging, issue #17

Previous commit didn't verify logging of exceptions.

Critical issues:
- types.TypeType is now built-in, added legacy switch
- filter yields `TypeError: 'filter' object is not subscriptable`,
changed to list comprehension (since it was used already the previous
line)

2to3 also complained the use of map over list comprehension, changed for
similar rationale.

airbrake/handler.py

@@ -93,7 +93,7 @@ def airbrake_error_from_logrecord(record):
     # find params from kwarg 'extra'
     # See "The second keyword argument is extra"
     #   - https://docs.python.org/2/library/logging.html#logging.Logger.debug
-    for key, val in vars(record).items():
+    for key, val in list(vars(record).items()):
         if not hasattr(_FAKE_LOGRECORD, key):
             # handle attribute/field name collisions:
             # logrecod attrs should not limit or take

airbrake/utils.py

@@ -7,7 +7,13 @@
 
 import traceback
 import types
+import sys
 
+if sys.version_info < (3,):
+    #Py2 legacy fix
+    type_of_type = types.TypeType
+else:
+    type_of_type = type
 
 class CheckableQueue(Queue):
 
@@ -42,9 +48,9 @@ def is_exc_info_tuple(exc_info):
     """
     try:
         errtype, value, tback = exc_info
-        if all(map(lambda x: x is None, exc_info)):
+        if all([x is None for x in exc_info]):
             return True
-        elif all((isinstance(errtype, types.TypeType),
+        elif all((isinstance(errtype, type_of_type),
                   isinstance(value, Exception),
                   isinstance(tback, types.TracebackType))):
             return True
@@ -92,6 +98,6 @@ def pytb_lastline(excinfo=None):
     # strip whitespace, Falsy values,
     # and the string 'None', sometimes returned by the traceback module
     lines = [line.strip() for line in lines if line]
-    lines = filter(lambda line: str(line).lower() != 'none', lines)
+    lines = [line for line in lines if str(line).lower() != 'none']
     if lines:
         return lines[-1]