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True
>>> foo + 42
Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
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logger is given a default logger is created.
Example::
logger = logging.getLogger(__name__)
LoggingUndefined = make_logging_undefined(
logger=logger,
base=Undefined
)
.. versionadded:: 2.8
:param logger: the logger to use. If not provided, a default logger
is created.
:param base: the base class to add logging functionality to. This
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Nr c sn | j d krX| jtkr d| j }q^t| jtsBdt| j| jf }q^dt| j| jf }n| j } jd| d S )Nz%s is undefinedz%s has no element %sz%s has no attribute %sz Template variable warning: %s)r r r r ra r r Zwarning)Zundefr )loggerr! r# _log_message s
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>>> str(foo)
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True
>>> foo + 42
Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
c C s< | j d kr2| jtkr d| j S dt| j| jf S d| j S )Nz{{ %s }}z {{ no such element: %s[%r] }}z!{{ undefined value printed: %s }})r r r r r )r7 r! r! r# r s
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>>> foo = StrictUndefined(name='foo')
>>> str(foo)
Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
>>> not foo
Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
>>> foo + 42
Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
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