以下は、関数とdocstringを含む更新されたPythonコードです：

```py
import os

def run_cmd_for_csv_files(dir1: str, dir2: str) -> None:
    """
    Iterate through two directories with the same structure. If there is a file whose name 
    contains '*.csv', run the bash command 'cmd file_path_in_dir1 file_path_in_dir2'.
    
    Parameters
    ----------
    dir1 : str
        The path of the first directory to be searched.
    dir2 : str
        The path of the second directory to be searched.
    
    Returns
    -------
    None
    """
    for file1, file2 in zip(sorted(os.listdir(dir1)), sorted(os.listdir(dir2))):
        if file1.endswith('.csv') and file2.endswith('.csv'):
            cmd = ['cmd1', os.path.join(dir1, file1), os.path.join(dir2, file2)]
            os.system(' '.join(cmd))
```

関数 `run_cmd_for_csv_files` は2つの引数を取る：dir1` と `dir2` である。dir1` と `dir2` は、一致する .csv ファイルを検索する 2 つのディレクトリのパスである。この関数は2つのディレクトリを繰り返し検索し、一致するファイルごとに `cmd1 file_path_in_dir1 file_path_in_dir2` コマンドを実行する。

この関数は何も返しませんが、ディレクトリ内の一致するファイルごとにbashコマンドを実行します。
Here is the updated Python code with the function and a docstring:

```py
import os

def run_cmd_for_csv_files(dir1: str, dir2: str) -> None:
    """
    Iterate through two directories with the same structure. If there is a file whose name 
    contains '*.csv', run the bash command 'cmd file_path_in_dir1 file_path_in_dir2'.
    
    Parameters
    ----------
    dir1 : str
        The path of the first directory to be searched.
    dir2 : str
        The path of the second directory to be searched.
    
    Returns
    -------
    None
    """
    for file1, file2 in zip(sorted(os.listdir(dir1)), sorted(os.listdir(dir2))):
        if file1.endswith('.csv') and file2.endswith('.csv'):
            cmd = ['cmd1', os.path.join(dir1, file1), os.path.join(dir2, file2)]
            os.system(' '.join(cmd))
```

The function `run_cmd_for_csv_files` takes two arguments: `dir1`, and `dir2`. `dir1` and `dir2` are the paths of the two directories to be searched for matching .csv files. The function iterates through the two directories and runs the command `cmd1 file_path_in_dir1 file_path_in_dir2` for each matching file.

The function does not return anything, but it executes the bash command for each matching file in the directories.