Move to the misc.py file

1 files changed, 24 insertions, 0 deletions

diff --git a/coverage/misc.py b/coverage/misc.py
index f9a30bc..f0e043b 100644
--- a/coverage/misc.py
+++ b/coverage/misc.py
@@ -4,6 +4,7 @@ import errno
 import hashlib
 import inspect
 import os
+import sys
 
 from coverage.backward import string_class, to_bytes
 
@@ -135,6 +136,29 @@ class Hasher(object):
         return self.md5.hexdigest()
 
 
+def overrides(obj, method_name, base_class):
+    """Does `obj` override the `method_name` it got from `base_class`?
+
+    Determine if `obj` implements the method called `method_name`, which it
+    inherited from `base_class`.
+
+    Returns a boolean.
+
+    """
+    klass = obj.__class__
+    klass_func = getattr(klass, method_name)
+    base_func = getattr(base_class, method_name)
+
+    # Python 2/3 compatibility: Python 2 returns an instancemethod object, the
+    # function is the .im_func attribute.  Python 3 returns a plain function
+    # object already.
+    if sys.version_info < (3, 0):
+        klass_func = klass_func.im_func
+        base_func = base_func.im_func
+
+    return klass_func is not base_func
+
+
 class CoverageException(Exception):
     """An exception specific to Coverage."""
     pass