Method lock

crates/vm/src/stdlib/_io.rs:2819–2823

(&self, vm: &VirtualMachine)

        }

        fn lock(&self, vm: &VirtualMachine) -> PyResult<PyMappedThreadMutexGuard<'_, TextIOData>> {
            let lock = self.lock_opt(vm)?;
            PyThreadMutexGuard::try_map(lock, |x| x.as_mut())
                .map_err(|_| vm.new_value_error("I/O operation on uninitialized object"))
        }

        fn validate_errors(errors: &PyRef<PyUtf8Str>, vm: &VirtualMachine) -> PyResult<()> {
            if errors.as_str().contains('\0') {