def multi_getattr(obj, attr, default = None):
"""
Get a named attribute from an object; multi_getattr(x, 'a.b.c.d') is
equivalent to x.a.b.c.d. When a default argument is given, it is
returned when any attribute in the chain doesn't exist; without
it, an exception is raised when a missing attribute is encountered.
"""
attributes = attr.split(".")
for i in attributes:
try:
obj = getattr(obj, i)
except AttributeError:
if default:
return default
else:
raise
return obj
# Example usage
obj = [1,2,3]
attr = "append.__doc__.capitalize.__doc__"
multi_getattr(obj, attr) #Will return the docstring for the
#capitalize method of the builtin string
#object
Diff to Previous Revision
--- revision 1 2010-08-05 07:01:54
+++ revision 2 2010-08-05 07:02:29
@@ -1,9 +1,9 @@
def multi_getattr(obj, attr, default = None):
"""
- Get a named attribute from an object; getattr(x, 'a.b.c.d') is
- equivalent to x.a.b.c.d When a default argument is given, it is
+ Get a named attribute from an object; multi_getattr(x, 'a.b.c.d') is
+ equivalent to x.a.b.c.d. When a default argument is given, it is
returned when any attribute in the chain doesn't exist; without
- it, an exception is raised when a missing attribute is found.
+ it, an exception is raised when a missing attribute is encountered.
"""
attributes = attr.split(".")
