Sequence Protocol

Return 1 if the object provides the sequence protocol, and 0 otherwise. Note that it returns 1 for Python classes with a ~object.__getitem__ method, unless they are dict subclasses, since in general it is impossible to determine what type of keys the class supports. This function always succeeds.

Return the concatenation of o1 and o2 on success, and NULL on failure. This is the equivalent of the Python expression o1 + o2.

Return the result of repeating sequence object o count times, or NULL on failure. This is the equivalent of the Python expression o * count.

Return the concatenation of o1 and o2 on success, and NULL on failure. The operation is done in-place when o1 supports it. This is the equivalent of the Python expression o1 += o2.

Return the result of repeating sequence object o count times, or NULL on failure. The operation is done in-place when o supports it. This is the equivalent of the Python expression o *= count.

Return the ith element of o, or NULL on failure. This is the equivalent of the Python expression o[i].

Return the slice of sequence object o between i1 and i2, or NULL on failure. This is the equivalent of the Python expression o[i1:i2].

Assign object v to the ith element of o. Raise an exception and return -1 on failure; return 0 on success. This is the equivalent of the Python statement o[i] = v. This function does not "steal" a reference to v.

If v is NULL, the element is deleted, but this feature is deprecated in favour of using PySequence_DelItem.

Delete the ith element of object o. Returns -1 on failure. This is the equivalent of the Python statement del o[i].

Assign the sequence object v to the slice in sequence object o from i1 to i2. This is the equivalent of the Python statement o[i1:i2] = v.

Delete the slice in sequence object o from i1 to i2. Returns -1 on failure. This is the equivalent of the Python statement del o[i1:i2].

Return the number of occurrences of value in o, that is, return the number of keys for which o[key] == value. On failure, return -1. This is equivalent to the Python expression o.count(value).

Determine if o contains value. If an item in o is equal to value, return 1, otherwise return 0. On error, return -1. This is equivalent to the Python expression value in o.

Alias for PySequence_Contains.

3.14 The function should no longer be used to write new code.

Return the first index i for which o[i] == value. On error, return -1. This is equivalent to the Python expression o.index(value).

Return a list object with the same contents as the sequence or iterable o, or NULL on failure. The returned list is guaranteed to be new. This is equivalent to the Python expression list(o).

pair: built-in function; tuple

Return a tuple object with the same contents as the sequence or iterable o, or NULL on failure. If o is a tuple, a new reference will be returned, otherwise a tuple will be constructed with the appropriate contents. This is equivalent to the Python expression tuple(o).

Return the sequence or iterable o as an object usable by the other PySequence_Fast* family of functions. If the object is not a sequence or iterable, raises TypeError with m as the message text. Returns NULL on failure.

The PySequence_Fast* functions are thus named because they assume o is a PyTupleObject or a PyListObject and access the data fields of o directly.

As a CPython implementation detail, if o is already a sequence or list, it will be returned.

Returns the length of o, assuming that o was returned by PySequence_Fast and that o is not NULL. The size can also be retrieved by calling PySequence_Size on o, but PySequence_Fast_GET_SIZE is faster because it can assume o is a list or tuple.

Return the ith element of o, assuming that o was returned by PySequence_Fast, o is not NULL, and that i is within bounds.

Return the underlying array of PyObject pointers. Assumes that o was returned by PySequence_Fast and o is not NULL.

Note, if a list gets resized, the reallocation may relocate the items array. So, only use the underlying array pointer in contexts where the sequence cannot change.

Return the ith element of o or NULL on failure. Faster form of PySequence_GetItem but without checking that PySequence_Check on o is true and without adjustment for negative indices.