Python 3.9 is now generally available.

google.appengine.api.validation.Range

Validates that numbers fall within the correct range.

Inherits From: Validator, expected_type

In theory this class can be emulated using Options, however error messages generated from that class will not be very intelligible. This class essentially does the same thing, but knows the intended integer range.

Also, this range class supports floats and other types that implement ordinality.

The range is inclusive, meaning 3 is considered in the range in Range(1,3).

minimum Minimum for attribute.
maximum Maximum for attribute.
range_type Type of field. Defaults to int.

AttributeDefinitionError If the specified parameters are incorrect.

Child Classes

class expected_type

Methods

CheckFieldInitialized

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Check for missing fields or conflicts between fields.

Default behavior performs a simple None-check, but this can be overridden. If the intent is to allow optional fields, then use the Optional validator instead.

Args
value Value to validate.
key Name of the field being validated.
obj The object to validate against.

Raises
ValidationError When there are missing or conflicting fields.

GetWarnings

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Return any warnings on this attribute.

Validates the value with an eye towards things that aren't fatal problems.

Args
value Value to validate.
key Name of the field being validated.
obj The object to validate against.

Returns
A list of tuples (context, warning) where

  • Context is the field (or dotted field path, if a sub-field)
  • Warning is the string warning text

ToValue

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Convert value to a simplified collection or basic type.

Subclasses of Validator should override this method when the dumped representation of value is not a simple <type>(value) (e.g., a regex).

Args
value An object of the same type that was returned from Validate().

Returns
An instance of a builtin type (e.g., int, str, dict, etc). By default it returns value unmodified.

Validate

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Validate that value is within range.

Validates against range-type then checks the range.

Args
value Value to validate.
key Name of the field being validated.

Raises
ValidationError When value is out of range.

__call__

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Main interface to validator is call mechanism.