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#!/usr/bin/env python
"""
Simple example of input validation.
"""
from prompt_toolkit import prompt
from prompt_toolkit.validation import Validator
def is_valid_email(text):
return "@" in text
validator = Validator.from_callable(
is_valid_email,
error_message="Not a valid e-mail address (Does not contain an @).",
move_cursor_to_end=True,
)
def main():
# Validate when pressing ENTER.
text = prompt(
"Enter e-mail address: ", validator=validator, validate_while_typing=False
)
print(f"You said: {text}")
# While typing
text = prompt(
"Enter e-mail address: ", validator=validator, validate_while_typing=True
)
print(f"You said: {text}")
if __name__ == "__main__":
main()
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