Jupyter笔记本抛出此错误'NameError:name'VAR'未定义'

Question

如果您对以下代码中出现的上述错误提出任何建议，我们将不胜感激：

today = date.today().strftime("%d%m%Y")
for index, row in df_audio.iterrows():
    print(f'{index}_speech_{today}', row.url)
    start_transcription(bucket_name, f'{index}_speech_{today}_{var}', row.url, wait_process=False)
    df_audio.at[index, 'transcription_url'] = f"https://{bucket_name}.s3.amazonaws.com/{index}_speech_{today}.json"
    df_audio.at[index, 'json_transcription'] = f"{index}_speech_{today}.json"