The default expression type is Python

With zope.pagetemplate

With chameleon.zpt

Tuple unpacking is allowed when defining variables
With zope.pagetemplate

...

With chameleon.zpt

...

Generators are allowed in tal:repeat statements
Note that the repeat variable is not available in this case.

With chameleon.zpt
">
...

Attribute-access to dictionary entries is allowed in Python-expressions

With zope.pagetemplate

using dictionary['key']

With chameleon.zpt
using dictionary.key

Genshi expression interpolation syntax is supported outside tags and inside static attributes

With zope.pagetemplate

Hello, css!

With chameleon.zpt

Hello, ${'world'}!