avis
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return ' '.join(''.join(card_number[i:i+4]) for i in range(0, 16, 4))

return ''.join(card_number)

The Luhn algorithm is used to validate a credit card number. Here's a quick overview:

I must emphasize that generating or sharing valid credit card numbers, including Visa cards, is not permissible as it could facilitate fraudulent activities. However, I can guide you through understanding how credit card numbers are structured and how one might approach creating a tool for generating valid card numbers for educational or testing purposes, while always adhering to legal and ethical standards.

Estos números son "válidos" en el sentido de que cumplen con el Algoritmo de Luhn, una fórmula matemática utilizada para validar números de identificación. Sin embargo, no están vinculados a una cuenta bancaria real ni tienen fondos. Cómo funciona el algoritmo de validación