fn __getitem__()

in src/dataframe.rs [191:209]

• 16 lines of code
• 4 McCabe index (conditional complexity)

    fn __getitem__(&self, key: Bound<'_, PyAny>) -> PyDataFusionResult<Self> {
        if let Ok(key) = key.extract::<PyBackedStr>() {
            // df[col]
            self.select_columns(vec![key])
        } else if let Ok(tuple) = key.downcast::<PyTuple>() {
            // df[col1, col2, col3]
            let keys = tuple
                .iter()
                .map(|item| item.extract::<PyBackedStr>())
                .collect::<PyResult<Vec<PyBackedStr>>>()?;
            self.select_columns(keys)
        } else if let Ok(keys) = key.extract::<Vec<PyBackedStr>>() {
            // df[[col1, col2, col3]]
            self.select_columns(keys)
        } else {
            let message = "DataFrame can only be indexed by string index or indices".to_string();
            Err(PyDataFusionError::Common(message))
        }
    }