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#!/usr/bin/env python
"""
Simple example of input validation.
"""
from __future__ import unicode_literals
from prompt_toolkit.validation import Validator, ValidationError
from prompt_toolkit import prompt
class EmailValidator(Validator):
def validate(self, document):
if '@' not in document.text:
raise ValidationError(message='Not a valid e-mail address (Does not contain an @).',
cursor_position=len(document.text)) # Move cursor to end of input.
def main():
text = prompt('Enter e-mail address: ', validator=EmailValidator())
print('You said: %s' % text)
if __name__ == '__main__':
main()
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