Wrapper

You can give a simple function for to_python , from_python , validate_python or validate_other . If that function raises an exception, the value is considered invalid. Whatever value the function returns is considered the converted value.

Unlike validators, the state argument is not used. Functions like int can be used here, that take a single argument.

Examples:

>>> def downcase(v):
...     return v.lower()
>>> wrap = Wrapper(to_python=downcase)
>>> wrap.to_python('This')
'this'
>>> wrap.from_python('This')
'This'
>>> wrap2 = Wrapper(from_python=downcase)
>>> wrap2.from_python('This')
'this'
>>> wrap2.from_python(1)
Traceback (most recent call last):
  ...
Invalid: 'int' object has no attribute 'lower'
>>> wrap3 = Wrapper(validate_python=int)
>>> wrap3.to_python('1')
'1'
>>> wrap3.to_python('a')
Traceback (most recent call last):
  ...
Invalid: invalid literal for int(): a

Messages

badType:

The input must be a string (not a %(type)s: %(value)r)

empty:

Please enter a value

noneType:

The input must be a string (not None)