1 if the object provides sequence protocol, and
0 otherwise. This function always succeeds.
-1 on failure. For objects that do not provide sequence
protocol, this is equivalent to the Python expression
"len(o)".
-1 on failure. This is the equivalent of the Python
statement "o[i] = v".
-1 on failure. This is the equivalent of the Python
statement "del o[i]".
-1 on failure. This is the equivalent of the Python
statement "del o[i1:i2]".
o[key] ==
value. On failure, return -1. This is equivalent to
the Python expression "o.count(value)".
1, otherwise return 0. On
error, return -1. This is equivalent to the Python expression
"value in o".
o[i] ==
value. On error, return -1. This is equivalent to
the Python expression "o.index(value)".
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