Fix unidiomatic type checking

common/lib/capa/capa/inputtypes.py

@@ -1560,7 +1560,7 @@ class AnnotationInput(InputTypeBase):
     def _unpack(self, json_value):
         """ Unpacks the json input state into a dict. """
         d = json.loads(json_value)
-        if type(d) != dict:
+        if not isinstance(d, dict):
             d = {}
 
         comment_value = d.get('comment', '')

common/lib/capa/capa/responsetypes.py

@@ -2505,7 +2505,7 @@ class FormulaResponse(LoncapaResponse):
         converted to float. Used so we can safely use Python contexts.
         """
         inp_d = dict([(k, numpy.complex(inp_d[k]))
-                      for k in inp_d if type(k) == str and
+                      for k in inp_d if isinstance(k, str) and
                       k.isalnum() and
                       isinstance(inp_d[k], numbers.Number)])
         return inp_d
@@ -2683,7 +2683,7 @@ class ImageResponse(LoncapaResponse):
             if correct_map[aid]['correctness'] != 'correct' and regions[aid]:
                 parsed_region = json.loads(regions[aid])
                 if parsed_region:
-                    if type(parsed_region[0][0]) != list:
+                    if not isinstance(parsed_region[0][0], list):
                         # we have [[1,2],[3,4],[5,6]] - single region
                         # instead of [[[1,2],[3,4],[5,6], [[1,2],[3,4],[5,6]]]
                         # or [[[1,2],[3,4],[5,6]]] - multiple regions syntax
@@ -2833,7 +2833,7 @@ class AnnotationResponse(LoncapaResponse):
     def _unpack(self, json_value):
         """Unpacks a student response value submitted as JSON."""
         json_d = json.loads(json_value)
-        if type(json_d) != dict:
+        if not isinstance(json_d, dict):
             json_d = {}
 
         comment_value = json_d.get('comment', '')

common/lib/capa/capa/tests/response_xml_factory.py

@@ -823,7 +823,7 @@ class ChoiceTextResponseXMLFactory(ResponseXMLFactory):
         choice_inputs = []
         # Ensure that the first element of choices is an ordered
         # collection. It will start as a list, a tuple, or not a Container.
-        if type(choices[0]) not in [list, tuple]:
+        if not isinstance(choices[0], (list, tuple)):
             choices = [choices]
 
         for choice in choices:
@@ -838,7 +838,7 @@ class ChoiceTextResponseXMLFactory(ResponseXMLFactory):
 
                 # Make sure that `answers` is an ordered collection for
                 # convenience.
-                if type(answers) not in [list, tuple]:
+                if not isinstance(answers, (list, tuple)):
                     answers = [answers]
 
                 numtolerance_inputs = [

common/lib/chem/chem/chemcalc.py

@@ -91,7 +91,7 @@ def _clean_parse_tree(tree):
                 'paren_group_square': lambda x: nltk.tree.Tree(x.node, x[1]),
                 'paren_group_round': lambda x: nltk.tree.Tree(x.node, x[1])}
 
-    if type(tree) == str:
+    if isinstance(tree, str):
         return tree
 
     old_node = None
@@ -124,7 +124,7 @@ def _merge_children(tree, tags):
         # Haven't grokked the code to tell if this is indeed the right thing to do.
         raise ParseException("Shouldn't have empty trees")
 
-    if type(tree) == str:
+    if isinstance(tree, str):
         return tree
 
     merged_children = []
@@ -134,7 +134,7 @@ def _merge_children(tree, tags):
     while not done:
         done = True
         for child in tree:
-            if type(child) == nltk.tree.Tree and child.node == tree.node and tree.node in tags:
+            if isinstance(child, nltk.tree.Tree) and child.node == tree.node and tree.node in tags:
                 merged_children = merged_children + list(child)
                 done = False
             else:
@@ -182,7 +182,7 @@ def _render_to_html(tree):
                 'paren_group_round': round_brackets,
                 'paren_group_square': square_brackets}
 
-    if type(tree) == str:
+    if isinstance(tree, str):
         return tree
     else:
         children = "".join(map(_render_to_html, tree))

common/lib/symmath/symmath/formula.py

@@ -96,7 +96,7 @@ def my_evalf(expr, chop=False):
     Enhanced sympy evalf to handle lists of expressions
     and catch eval failures without dropping out.
     """
-    if type(expr) == list:
+    if isinstance(expr, list):
         try:
             return [x.evalf(chop=chop) for x in expr]
         except:
@@ -140,7 +140,7 @@ def my_sympify(expr, normphase=False, matrix=False, abcsym=False, do_qubit=False
 
     sexpr = sympify(expr, locals=varset)
     if normphase:	 # remove overall phase if sexpr is a list
-        if type(sexpr) == list:
+        if isinstance(sexpr, list):
             if sexpr[0].is_number:
                 ophase = sympy.sympify('exp(-I*arg(%s))' % sexpr[0])
                 sexpr = [sympy.Mul(x, ophase) for x in sexpr]
@@ -150,10 +150,10 @@ def my_sympify(expr, normphase=False, matrix=False, abcsym=False, do_qubit=False
         Convert a list, or list of lists to a matrix.
         """
         # if expr is a list of lists, and is rectangular, then return Matrix(expr)
-        if not type(expr) == list:
+        if not isinstance(expr, list):
             return expr
         for row in expr:
-            if (not type(row) == list):
+            if not isinstance(row, list):
                 return expr
         rdim = len(expr[0])
         for row in expr:
@@ -230,7 +230,7 @@ class formula(object):
         it, if possible...
         """
 
-        if type(xml) == str or type(xml) == unicode:
+        if isinstance(xml, (str, unicode)):
             xml = etree.fromstring(xml)		# TODO: wrap in try
 
         xml = self.fix_greek_in_mathml(xml)	 # convert greek utf letters to greek spelled out in ascii

common/lib/symmath/symmath/symmath_check.py

@@ -287,7 +287,7 @@ def symmath_check(expect, ans, dynamath=None, options=None, debug=None, xml=None
     if fexpect == fsym:
         return {'ok': True, 'msg': msg}
 
-    if type(fexpect) == list:
+    if isinstance(fexpect, list):
         try:
             xgiven = my_evalf(fsym, chop=True)
             dm = my_evalf(sympy.Matrix(fexpect) - sympy.Matrix(xgiven), chop=True)

common/lib/xmodule/xmodule/lti_2_util.py

@@ -321,8 +321,8 @@ class LTI20ModuleMixin(object):
 
         # the standard supports a list of objects, who knows why. It must contain at least 1 element, and the
         # first element must be a dict
-        if type(json_obj) != dict:
-            if type(json_obj) == list and len(json_obj) >= 1 and type(json_obj[0]) == dict:
+        if not isinstance(json_obj, dict):
+            if isinstance(json_obj, list) and len(json_obj) >= 1 and isinstance(json_obj[0], dict):
                 json_obj = json_obj[0]
             else:
                 msg = ("Supplied JSON string is a list that does not contain an object as the first element. {}"

common/lib/xmodule/xmodule/tabs.py

@@ -126,7 +126,7 @@ class CourseTab(object):
         was implemented).
         """
 
-        if type(other) is dict and not self.validate(other, raise_error=False):
+        if isinstance(other, dict) and not self.validate(other, raise_error=False):
             # 'other' is a dict-type tab and did not validate
             return False
 

lms/djangoapps/foldit/tests.py

@@ -51,9 +51,9 @@ class FolditTestCase(TestCase):
         Given lists of puzzle_ids and best_scores (must have same length), make a
         SetPlayerPuzzleScores request and return the response.
         """
-        if not(type(best_scores) == list):
+        if not isinstance(best_scores, list):
             best_scores = [best_scores]
-        if not(type(puzzle_ids) == list):
+        if not isinstance(puzzle_ids, list):
             puzzle_ids = [puzzle_ids]
         user = self.user if not user else user
 

lms/djangoapps/lms_migration/migrate.py

@@ -139,7 +139,7 @@ def manage_modulestores(request, reload_dir=None, commit_id=None):
         for field in dumpfields:
             data = getattr(course, field, None)
             html += '<h3>%s</h3>' % field
-            if type(data) == dict:
+            if isinstance(data, dict):
                 html += '<ul>'
                 for k, v in data.items():
                     html += '<li>%s:%s</li>' % (escape(k), escape(v))

lms/djangoapps/mobile_api/social_facebook/courses/views.py

@@ -37,7 +37,7 @@ class CoursesWithFriends(generics.ListAPIView):
 
         # Get friends from Facebook
         result = get_friends_from_facebook(serializer)
-        if type(result) != list:
+        if not isinstance(result, list):
             return result
 
         friends_that_are_edx_users = get_linked_edx_accounts(result)

lms/djangoapps/mobile_api/social_facebook/friends/views.py

@@ -46,7 +46,7 @@ class FriendsInCourse(generics.ListAPIView):
 
         # Get all the user's FB friends
         result = get_friends_from_facebook(serializer)
-        if type(result) != list:
+        if not isinstance(result, list):
             return result
 
         def is_member(friend, course_key):

lms/djangoapps/notes/models.py

@@ -30,7 +30,7 @@ class Note(models.Model):
             raise ValidationError('Note must have a body.')
 
         body = json.loads(json_body)
-        if not type(body) is dict:
+        if not isinstance(body, dict):
             raise ValidationError('Note body must be a dictionary.')
 
         # NOTE: all three of these fields should be considered user input