region format is illegal, only digit, letter and - is allowed!（.env文件中行内注释导致！！）

引子：一个图片上传功能，用腾讯云cos，一直找不到错误原因，结果是.env文件中的行内注释！

错误描述

• 上传图片代码

def action_upload_img_cloud(request):
    user = CustomUser.objects.get(id=request.user_id)

    file = request.FILES['img']
    file_name = file.name
    unique_file_name = f"{uuid.uuid4().hex}_{file_name}"

    try:
        config = CosConfig(Region=settings.TENCENT_CLOUD_REGION, SecretId=settings.TENCENT_CLOUD_SECRET_ID, SecretKey=settings.TENCENT_CLOUD_SECRET_KEY)
        client = CosS3Client(config)
        response = client.put_object(Bucket=settings.TENCENT_CLOUD_BUCKET, Body=file, Key=unique_file_name)
        response_url = f'https://{settings.TENCENT_CLOUD_BUCKET}.cos.{settings.TENCENT_CLOUD_REGION}.myqcloud.com/{unique_file_name}'
    except Exception as e:
        print(e)
        return err(404, '腾讯云配置错误')

    Image添加数据库记录
    image = Image.objects.create(
        image=response_url,
        uploader=user
    )
    return result({'url': response_url})

一直报错：region format is illegal, only digit, letter and - is allowed!

解决

• 跟踪到报错位置，是TENCENT_CLOUD_REGION的问题
  

settings的变量来自.env文件，
.env配置

# @ 腾讯云cos配置
TENCENT_CLOUD_SECRET_ID = '=================='
TENCENT_CLOUD_SECRET_KEY = '=================='
TENCENT_CLOUD_BUCKET = 'wutnote-13424424'
TENCENT_CLOUD_REGION = 'ap-shanghai'  # 存储桶所在区域

没错，就是行内注释！！捣的鬼

去除# 存储桶所在区域行内注释终于通了。