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    Mix bytes from *string* into the PRNG state.

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    For more information, see e.g. :rfc:`1750`.

    This function is only relevant if you are forking Python processes and
    need to reseed the CSPRNG after fork.

    :param buffer: Buffer with random data.
    :param entropy: The entropy (in bytes) measurement of the buffer.

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    :return: 1 if the PRNG is seeded enough, 0 otherwise.
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