Function pylong_from_u32_digits 

fn pylong_from_u32_digits<I>(
    py: Python<'_>,
    negative: bool,
    bits: usize,
    digits: I,
) -> Bound<'_, PyInt>
where
    I: ExactSizeIterator<Item = u32>,

Available on crate feature num-bigint and (Py_3_15, or Py_3_14 and non-Py_LIMITED_API) only.