pythontemplate-talchameleonkeyerror

Any way to suppress key errors when a dictionary key is not found in Chameleon ZPT templates?

Sometimes it would be nice to be able to do this, just return None in any expression evaluating for a nonexistent dict key instead of raising KeyError.

Solution

  • You'd use dict.get() to access the key instead:

    <div tal:attributes="class some_dict.get(some_key)">

    where the class attribute would be omitted if some_key is not present, as the default return value from dict.get() is None if the key is missing.