The MaxLength class is accessible via the formencode.validators module.
Examples:
>>> max5 = MaxLength(5)
>>> max5.to_python('12345')
'12345'
>>> max5.from_python('12345')
'12345'
>>> max5.to_python('123456')
Traceback (most recent call last):
...
Invalid: Enter a value less than 5 characters long
>>> max5(accept_python=False).from_python('123456')
Traceback (most recent call last):
...
Invalid: Enter a value less than 5 characters long
>>> max5.to_python([1, 2, 3])
[1, 2, 3]
>>> max5.to_python([1, 2, 3, 4, 5, 6])
Traceback (most recent call last):
...
Invalid: Enter a value less than 5 characters long
>>> max5.to_python(5)
Traceback (most recent call last):
...
Invalid: Invalid value (value with length expected)
Messages
See the source for more information.