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Core classes for validation.
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Retrieve the location of locales.
If we're built as an egg, we need to find the resource within the egg.
Otherwise, we need to look for the locales on the filesystem or in the
system message catalog.
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This is raised in response to invalid input. It has several
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msg:
The message, *without* values substituted. For instance, if
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substituteArgs:
The arguments (a dictionary) to go with `msg`.
str(self):
The message describing the error, with values substituted.
value:
The offending (invalid) value.
state:
The state that went with this validator. This is an
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error_list:
If this was a compound validator that takes a repeating value,
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error_dict:
Like `error_list`, but for dictionary compound validators.
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The base class of most validators. See `IValidator` for more, and
`FancyValidator` for the more common (and more featureful) class.
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