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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def key_verify(rsakey, signature, message, digest):
 """Verify the given signature with the RSA key."""

    padding = _asymmetric.padding.PKCS1v15()
    if isinstance(rsakey, _asymmetric.rsa.RSAPrivateKey):
        rsakey = rsakey.public_key()

    try:
        rsakey.verify(signature, message, padding, digest)
    except Exception as e:
        return False
    else:
        return True