Method _contains

crates/vm/src/builtins/str.rs:611–620

(&self, needle: &PyObject, vm: &VirtualMachine)

    }

    fn _contains(&self, needle: &PyObject, vm: &VirtualMachine) -> PyResult<bool> {
        if let Some(needle) = needle.downcast_ref::<Self>() {
            Ok(memchr::memmem::find(self.as_bytes(), needle.as_bytes()).is_some())
        } else {
            Err(vm.new_type_error(format!(
                "'in <string>' requires string as left operand, not {}",
                needle.class().name()
            )))
        }
    }

    fn __contains__(&self, needle: PyObjectRef, vm: &VirtualMachine) -> PyResult<bool> {
        self._contains(&needle, vm)