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no test named 'None' #520

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jakirkham opened this issue Dec 13, 2015 · 2 comments
Closed

no test named 'None' #520

jakirkham opened this issue Dec 13, 2015 · 2 comments

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@jakirkham
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Running into an issue where using a template like this {{"" if np is None else np}}, I get the following exception jinja2.exceptions.TemplateAssertionError: no test named 'None'. Trying with is not has similar problems.
@ThiefMaster
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Use lowercase none.

Jinja's is is different from Python's is. It invokes functions registered as "tests". And while there's a none test, there's no test named None.

Useful side-note: Jinja also uses lowercase for true and false, even though the python-cased True and False work too.

@jakirkham
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Thanks @ThiefMaster. I'm still pretty new to jinja, but it seems pretty cool. Thanks for the pointers too.

@samiwel samiwel mentioned this issue Oct 25, 2016
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@judell judell mentioned this issue Aug 3, 2017
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@jaredhasenklein jaredhasenklein mentioned this issue Feb 16, 2019
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@davidcaron davidcaron mentioned this issue May 13, 2019
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@DasSkelett DasSkelett mentioned this issue Aug 2, 2019
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bibliotechy pushed a commit to tulibraries/ansible-role-airflow that referenced this issue Jun 10, 2020
Use none instead of None
62fade2 
ansible when evaluates the statement as jinja, and jinja "is" is not the
same as Python "is". In the words of President CLinton, it depends when the definition of "is" is.

More info in pallets/jinja#520
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@ThiefMaster @jakirkham