pyo3_ffi

Function PyUnicode_Fill

Source 
pub unsafe extern "C" fn PyUnicode_Fill(
    unicode: *mut PyObject,
    start: Py_ssize_t,
    length: Py_ssize_t,
    fill_char: Py_UCS4,
) -> Py_ssize_t
Available on non-Py_LIMITED_API and non-PyPy only.