Function len

include/pybind11/pytypes.h:2551–2557

Get the length of a Python object.

/// Get the length of a Python object.
inline size_t len(handle h) {
    ssize_t result = PyObject_Length(h.ptr());
    if (result < 0) {
        throw error_already_set();
    }
    return static_cast<size_t>(result);
}

/// Get the length hint of a Python object.
/// Returns 0 when this cannot be determined.