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module for accessing a YubiKey

In an attempt to support any future versions of the YubiKey which
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communication with YubiKeys.

Example usage (if using this module directly, see base module yubico) :

    import yubico.yubikey

    try:
        YK = yubico.yubikey.find_key()
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    Locate a connected YubiKey. Throws an exception if none is found.

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