matplotlib and Zope

Hello Yves,

However, integrating matplotlib functionnalities
through an External Method is a pain to maintain : any change to your function
means delete/recreate an External Method object in Zope. Not very sustainable.

Just a quick comment: I also use External Methods for creating Matplotlib charts but deleting/recreating is not necessary upon changes. Maybe you had to do this because you were not running Zope in debug mode? Haven't tried this with debug off though.

Best regards,
Sascha