Merge branch 'nedbat/dynamic-contexts'

1 files changed, 40 insertions, 0 deletions

diff --git a/lab/find_class.py b/lab/find_class.py
new file mode 100644
index 00000000..d8dac0b5
--- /dev/null
+++ b/lab/find_class.py
@@ -0,0 +1,40 @@
+class Parent(object):
+    def meth(self):
+        print("METH")
+
+class Child(Parent):
+    pass
+
+def trace(frame, event, args):
+    # Thanks to Aleksi Torhamo for code and idea.
+    co = frame.f_code
+    fname = co.co_name
+    if not co.co_varnames:
+        return
+    locs = frame.f_locals
+    first_arg = co.co_varnames[0]
+    if co.co_argcount:
+        self = locs[first_arg]
+    elif co.co_flags & 0x04:    # *args syntax
+        self = locs[first_arg][0]
+    else:
+        return
+
+    func = getattr(self, fname).__func__
+    if hasattr(func, '__qualname__'):
+        qname = func.__qualname__
+    else:
+        for cls in self.__class__.__mro__:
+            f = cls.__dict__.get(fname, None)
+            if f is None:
+                continue
+            if f is func:
+                qname = cls.__name__ + "." + fname
+                break
+    print("{}: {}.{} {}".format(event, self, fname, qname))
+    return trace
+
+import sys
+sys.settrace(trace)
+
+Child().meth()