Python 3.6+secretsfunction

secrets.token_bytes()

tokens

Returns nbytes cryptographically strong random bytes, suitable for keys, salts and one-time codes.

Syntax

secrets.token_bytes(nbytes=None) -> bytes

With no argument a sensible default length is used (32 bytes today), and you should not go lower. Unlike random.randbytes(), the source is os.urandom, so the result cannot be reproduced with seed; that is the point, not a flaw. For a text token, token_hex() or token_urlsafe() is more convenient.

Examples

import secrets
key = secrets.token_bytes(16)
print(type(key).__name__, len(key))  # → bytes 16
print(len(secrets.token_bytes()))  # → 32
print(key)  # → ? случайные байты

See also

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