Python for循环错误`TypeError：只能将元组（不是“str”）连接到元组`答案

【问题标题】：Python for-loop error `TypeError: can only concatenate tuple (not "str") to tuple`Python for循环错误`TypeError：只能将元组（不是“str”）连接到元组`
【发布时间】：2021-07-26 18:20:43
【问题描述】：

我有一个 python for 循环，它应该使用来自 uuid_list 的每个 uuid，然后转到正确的 AWS S3 存储桶、组织等，以获取正确的证书和密钥以将消息发送到 IOT 主题。

uuid_list = ["cde2107e-8736-47de-9e87-2033c3063589", "7904f39f-97b0-4a6e-bd9d-fa692c40fe6f"]

for uuid in uuid_list:
        s3_client = boto3.client('s3')
        bucket = 'sensor-certificates'
        org = "abc", "def"
        object_str = org + '/' + uuid + '/'
        result = s3_client.list_objects(Bucket=bucket, Prefix=object_str)
        print('-------------------')
        print(result)
        print('-------------------')

我的问题是，随着我的扩大规模，我现在拥有多个组织。我试过把它们放在一个列表中，就像上面一样，但我得到了错误

can only concatenate tuple (not "str") to tuple: TypeError
Traceback (most recent call last):
  File "/var/task/iot_sim_lambda.py", line 78, in lambda_handler
    object_str = org + '/' + uuid + '/'
TypeError: can only concatenate tuple (not "str") to tuple

谁能建议我在尝试获取证书时如何让循环识别多个组织

【问题讨论】：

看起来 org 或 uuid 是一个元组，但你是串联 "/"
您已将org 定义为一个元组....."abc", "def"。

标签： python

【解决方案1】：

您显然需要将org = "abc", "def" 转换为列表并将其置于循环之外。

uuid_list = ["cde2107e-8736-47de-9e87-2033c3063589", "7904f39f-97b0-4a6e-bd9d-fa692c40fe6f"]
orgs = ["abc", "def"]
for uuid in uuid_list:
    for org in orgs:
        s3_client = boto3.client('s3')
        bucket = 'sensor-certificates'
        object_str = org + '/' + uuid + '/'
        result = s3_client.list_objects(Bucket=bucket, Prefix=object_str)
        print('-------------------')
        print(result)
        print('-------------------')

【讨论】：

【解决方案2】：

下面的代码会给你一个元组对象：-

org = "abc", "def"

这里的 org 是一个元组对象，您正试图将它与一个字符串连接起来。只需执行以下操作：-

org = "abc" + "def"

它会给你一个字符串，然后你可以将它与 uuid 连接起来。更新您的代码如下：-

uuid_list = ["cde2107e-8736-47de-9e87-2033c3063589", "7904f39f-97b0-4a6e-bd9d-fa692c40fe6f"]

for uuid in uuid_list:
        s3_client = boto3.client('s3')
        bucket = 'sensor-certificates'
        org = "abc" + "def"
        object_str = org + '/' + uuid + '/'
        result = s3_client.list_objects(Bucket=bucket, Prefix=object_str)
        print('-------------------')
        print(result)
        print('-------------------')

【讨论】：

【解决方案3】：

uuid_list = ["cde2107e-8736-47de-9e87-2033c3063589", "7904f39f-97b0-4a6e-bd9d- 
fa692c40fe6f"]

for uuid in uuid_list:
        s3_client = boto3.client('s3')
        bucket = 'sensor-certificates'
        for org in ["abc", "def"]:
            object_str = org + '/' + uuid + '/'
            result = s3_client.list_objects(Bucket=bucket, Prefix=object_str)
            print('-------------------')
            print(result)
            print('-------------------')

【讨论】：