The Python community has a long history of April Fool's postings to news:comp.lang.python (a.k.a. mailto:python-list@python.org). We've collected references to a number of them here. If you know of more, please update the page.
Postings and Press Releases
Edit conflict - other version:
2003 Stackless Perl 4.0
2004 'goto' for Python (which actually works!)
Edit conflict - your version:
2003 Stackless Perl 4.0
2004 'goto' for Python (which actually works!)
End of edit conflict
April Fool's PEPs
Python humor on the web
1998 First Pythonic Award
- humor on python.org (includes the Zen of Python)