python-exception

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def validate(name):
    if len(name) < 10:
        raise ValueError

>>> validate('joe')
Traceback (most recent call last):
  File "<input>", line 1, in <module>
    validate('joe')
  File "<input>", line 3, in validate
    raise ValueError
ValueError


class NameTooShortError(ValueError):
    pass

def validate(name):
    if len(name) < 10:
        raise NameTooShortError(name)