Fixed #17061 -- Factored out importing object from a dotted path

Thanks Carl Meyer for the report.

django/template/context.py

@@ -1,6 +1,5 @@
 from copy import copy
-from django.core.exceptions import ImproperlyConfigured
-from django.utils.importlib import import_module
+from django.utils.module_loading import import_by_path
 
 # Cache of actual callables.
 _standard_context_processors = None
@@ -146,16 +145,7 @@ def get_standard_processors():
         collect.extend(_builtin_context_processors)
         collect.extend(settings.TEMPLATE_CONTEXT_PROCESSORS)
         for path in collect:
-            i = path.rfind('.')
-            module, attr = path[:i], path[i+1:]
-            try:
-                mod = import_module(module)
-            except ImportError as e:
-                raise ImproperlyConfigured('Error importing request processor module %s: "%s"' % (module, e))
-            try:
-                func = getattr(mod, attr)
-            except AttributeError:
-                raise ImproperlyConfigured('Module "%s" does not define a "%s" callable request processor' % (module, attr))
+            func = import_by_path(path)
             processors.append(func)
         _standard_context_processors = tuple(processors)
     return _standard_context_processors

django/template/loader.py

@@ -27,8 +27,8 @@
 
 from django.core.exceptions import ImproperlyConfigured
 from django.template.base import Origin, Template, Context, TemplateDoesNotExist, add_to_builtins
-from django.utils.importlib import import_module
 from django.conf import settings
+from django.utils.module_loading import import_by_path
 from django.utils import six
 
 template_source_loaders = None
@@ -91,15 +91,7 @@ def find_template_loader(loader):
     else:
         args = []
     if isinstance(loader, six.string_types):
-        module, attr = loader.rsplit('.', 1)
-        try:
-            mod = import_module(module)
-        except ImportError as e:
-            raise ImproperlyConfigured('Error importing template source loader %s: "%s"' % (loader, e))
-        try:
-            TemplateLoader = getattr(mod, attr)
-        except AttributeError as e:
-            raise ImproperlyConfigured('Error importing template source loader %s: "%s"' % (loader, e))
+        TemplateLoader = import_by_path(loader)
 
         if hasattr(TemplateLoader, 'load_template_source'):
             func = TemplateLoader(*args)