def load_public_key(source):
    """
    Loads a public key into a PublicKey object

    :param source:
        A byte string of file contents, a unicode string filename or an
        asn1crypto.keys.PublicKeyInfo object

    :raises:
        ValueError - when any of the parameters contain an invalid value
        TypeError - when any of the parameters are of the wrong type
        oscrypto.errors.AsymmetricKeyError - when the public key is incompatible with the OS crypto library
        OSError - when an error is returned by the OS crypto library

    :return:
        A PublicKey object
    """

    if isinstance(source, keys.PublicKeyInfo):
        public_key = source

    elif isinstance(source, byte_cls):
        public_key = parse_public(source)

    elif isinstance(source, str_cls):
        with open(source, 'rb') as f:
            public_key = parse_public(f.read())

    else:
        raise TypeError(pretty_message(
            '''
            source must be a byte string, unicode string or
            asn1crypto.keys.PublicKeyInfo object, not %s
            ''',
            type_name(public_key)
        ))

    return _load_key(public_key, PublicKey)
def load_public_key(source):
    """
    Loads a public key into a PublicKey object

    :param source:
        A byte string of file contents, a unicode string filename or an
        asn1crypto.keys.PublicKeyInfo object

    :raises:
        ValueError - when any of the parameters contain an invalid value
        TypeError - when any of the parameters are of the wrong type
        oscrypto.errors.AsymmetricKeyError - when the public key is incompatible with the OS crypto library
        OSError - when an error is returned by the OS crypto library

    :return:
        A PublicKey object
    """

    if isinstance(source, keys.PublicKeyInfo):
        public_key = source

    elif isinstance(source, byte_cls):
        public_key = parse_public(source)

    elif isinstance(source, str_cls):
        with open(source, 'rb') as f:
            public_key = parse_public(f.read())

    else:
        raise TypeError(pretty_message(
            '''
            source must be a byte string, unicode string or
            asn1crypto.keys.PublicKeyInfo object, not %s
            ''',
            type_name(public_key)
        ))

    return _load_key(public_key, PublicKey)
def load_public_key ( source ) : if isinstance ( source , keys . PublicKeyInfo ) : public_key = source elif isinstance ( source , byte_cls ) : public_key = parse_public ( source ) elif isinstance ( source , str_cls ) : with open ( source , 'rb' ) as f : public_key = parse_public ( f . read ( ) ) else : raise TypeError ( pretty_message ( '''
            source must be a byte string, unicode string or
            asn1crypto.keys.PublicKeyInfo object, not %s
            ''' , type_name ( public_key ) ) ) return _load_key ( public_key , PublicKey )
Loads a public key into a PublicKey object

    :param source:
        A byte string of file contents, a unicode string filename or an
        asn1crypto.keys.PublicKeyInfo object

    :raises:
        ValueError - when any of the parameters contain an invalid value
        TypeError - when any of the parameters are of the wrong type
        oscrypto.errors.AsymmetricKeyError - when the public key is incompatible with the OS crypto library
        OSError - when an error is returned by the OS crypto library

    :return:
        A PublicKey object
Loads a public key into a PublicKey object