python - pymongo.errors.ConfigurationError : The "dnspython" module must be installed to use mongodb+srv://URIs even after pymongo and dnspython installed

Question

我尝试使用 pymongo 连接 MongoDB。但是遇到了dnspython必须安装的错误即使在我安装了 pymongo 和 dnspython 之后。

我的代码是:

import pymongo
USER = ''
PASSWORD = ''

client = pymongo.MongoClient(
    "mongodb+srv://" + USER + ":" + PASSWORD + "@tbn-ph9ol.mongodb.net/test?retryWrites=true&w=majority")

db = client["tbn"]

collection = db["inputs"]

post = {"_id": 0,
        "temperature": 37,
        }

collection.insert_one(post)

为什么mongodb不能识别我已经安装了pymongo和dnspython？

Answer 1

您的问题是您没有 dnspython安装在您正在运行的环境中。如果您确实安装了 dnspython，则不会收到此错误消息。

使用 docker 中的临时环境很容易证明这一点；使用以下命令启动 docker 容器:

docker run --rm -it python:3.8.1-buster /bin/bash

然后在 shell 中运行以下命令以在仅安装了 pymongo 的新 venv 中创建和运行您的程序:

cd "$(mktemp -d)"
python -m venv venv
. venv/bin/activate
pip install --upgrade pip
pip install pymongo
cat << EOF > test.py
import pymongo
USER = 'x'
PASSWORD = 'y'

client = pymongo.MongoClient(
    "mongodb+srv://" + USER + ":" + PASSWORD + "@tbn-ph9ol.mongodb.net/test?retryWrites=true&w=majority")

db = client["tbn"]

collection = db["inputs"]

post = {"_id": 0,
        "temperature": 37,
        }

collection.insert_one(post)
EOF
pip freeze && python test.py

您应该看到以下输出:

pymongo==3.10.1
Traceback (most recent call last):
  File "test.py", line 5, in <module>
    client = pymongo.MongoClient(
  File "/tmp/tmp.vdpqnMOnFO/venv/lib/python3.8/site-packages/pymongo/mongo_client.py", line 619, in __init__
    res = uri_parser.parse_uri(
  File "/tmp/tmp.vdpqnMOnFO/venv/lib/python3.8/site-packages/pymongo/uri_parser.py", line 390, in parse_uri
    raise ConfigurationError('The "dnspython" module must be '
pymongo.errors.ConfigurationError: The "dnspython" module must be installed to use mongodb+srv:// URIs

你会观察到你得到的错误。现在添加 dnspython 并再次运行:

pip install dnspython
pip freeze && python test.py

您现在将看到一条身份验证失败消息，因为我们没有正确的用户名和密码。你可以从 pip freeze看到这次安装dnspython的命令。

dnspython==1.16.0
pymongo==3.10.1
Traceback (most recent call last):
  File "test.py", line 16, in <module>
    collection.insert_one(post)
  File "/tmp/tmp.vdpqnMOnFO/venv/lib/python3.8/site-packages/pymongo/collection.py", line 695, in insert_one
...
... <snip>
...
pymongo.errors.OperationFailure: Authentication failed.