Method map_py_iter

crates/vm/src/vm/mod.rs:1902–1926

(&self, value: &PyObject, mut f: F)

    }

    fn map_py_iter<F, R>(&self, value: &PyObject, mut f: F) -> PyResult<Vec<R>>
    where
        F: FnMut(PyObjectRef) -> PyResult<R>,
    {
        let iter = value.to_owned().get_iter(self)?;
        let cap = match self.length_hint_opt(value.to_owned()) {
            Err(e) if e.class().is(self.ctx.exceptions.runtime_error) => return Err(e),
            Ok(Some(value)) => Some(value),
            // Use a power of 2 as a default capacity.
            _ => None,
        };
        // TODO: fix extend to do this check (?), see test_extend in Lib/test/list_tests.py,
        // https://github.com/python/cpython/blob/v3.9.0/Objects/listobject.c#L922-L928
        if let Some(cap) = cap
            && cap >= isize::MAX as usize
        {
            return Ok(Vec::new());
        }

        let mut results = PyIterIter::new(self, iter.as_ref(), cap)
            .map(|element| f(element?))
            .collect::<PyResult<Vec<_>>>()?;
        results.shrink_to_fit();
        Ok(results)
    }

    pub fn get_attribute_opt<'a>(
        &self,