Python - 嘗試除了多種可能性

Question

我正在嘗試以下操作：

try:
    scroll_token = response["scroll_token"]

except ValueError as e:
    logging.info(f'could not find "scroll_token" {e}')

    try:
        scroll_token = response["scroll_id"]
    except ValueError as e:
        logging.info(f'could not find "scroll_id" {e}')

如果響應中沒有“scroll_token”，那么我希望它查看響應中是否有“scroll_id”。 但由於某種原因，這不起作用，它只是在第一次嘗試案例中一直失敗並說：

scroll_token = response["scroll_token"] KeyError: 'scroll_token'

Answer 1

您正在捕獲錯誤的異常； 您期望可能會引發KeyError 。

try:
    scroll_token = response["scroll_token"]

except KeyError as e:
    logging.info(f'could not find "scroll_token" {e}')

    try:
        scroll_token = response["scroll_id"]
    except KeyError as e:
        logging.info(f'could not find "scroll_id" {e}')

您可以使用循環更簡單地編寫它。

for k in ["scroll_token", "scroll_id"]:
    try:
        scroll_token = response[k]
        break
    except KeyError:
        logging.info("could not find %s", k)
else:
    # What to do if neither key is found?
    ...