http://code.activestate.com/recipes/users/1120451/2003-09-29T19:46:17-07:00ActiveState Code Recipes2003-09-29T19:46:17-07:00Hannu Kankaanpäähttp://code.activestate.com/recipes/users/1120451/http://code.activestate.com/recipes/224980-assertion-that-all-base-class-initializers-get-cal/

<p style="color: grey"> Python recipe 224980 by <a href="/recipes/users/1120451/">Hannu Kankaanpää</a> (<a href="/recipes/tags/debugging/">debugging</a>). Revision 5. </p> <p>This code can be used in debugging phase to notice errors sooner. It is usually always desirable to visit all base class __init__-methods, but Python does nothing to ensure they will be visited. Set AssertInit as a metaclass in the base class of your class hierarchy, and all errors from not calling base class __init__s will be cleanly reported as AssertionErrors.</p> <p>The solution should work properly with multiple inheritance and diamond-shaped inheritance graphs (see the example at the bottom of code).</p> <p>It slows down object creation by a large amount (I'd assume but didn't do any tests).</p>