故障排除

pymongo.errors.ConfigurationError: Server at localhost:27017 reports wire version 5, but this version of PyMongo requires at least 6 (MongoDB 3.6).

File "/Library/Python/2.7/site-packages/pymongo/collection.py", line 1560, in count
  return self._count(cmd, collation, session)
  File "/Library/Python/2.7/site-packages/pymongo/collection.py", line 1504, in _count
  with self._socket_for_reads() as (connection, slave_ok):
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/contextlib.py", line 17, in __enter__
  return self.gen.next()
  File "/Library/Python/2.7/site-packages/pymongo/mongo_client.py", line 982, in _socket_for_reads
  server = topology.select_server(read_preference)
  File "/Library/Python/2.7/site-packages/pymongo/topology.py", line 224, in select_server
  address))
  File "/Library/Python/2.7/site-packages/pymongo/topology.py", line 183, in select_servers
  selector, server_timeout, address)
  File "/Library/Python/2.7/site-packages/pymongo/topology.py", line 199, in _select_servers_loop
  self._error_message(selector))
pymongo.errors.ServerSelectionTimeoutError: localhost:27017: timed out

"/posts/50b3bda58a02fb9a84d8991e"

from pymongo import MongoClient
from bson.objectid import ObjectId
from flask import Flask, render_template
client = MongoClient()
app = Flask(__name__)
@app.route("/posts/<_id>")
def show_post(_id):
   # NOTE!: converting _id from string to ObjectId before passing to find_one
   post = client.db.posts.find_one({'_id': ObjectId(_id)})
   return render_template('post.html', post=post)
if __name__ == "__main__":
    app.run()

// mongo shell
db.collection.insertOne( { "_id" : 1, "subdocument" : { "b" : 1, "a" : 1 } } )
// Returns: WriteResult({ "nInserted" : 1 })
db.collection.findOne()
// Returns: { "_id" : 1, "subdocument" : { "b" : 1, "a" : 1 } }

print({'a': 1.0, 'b': 1.0})
# Returns: {'a': 1.0, 'b': 1.0}
print({'b': 1.0, 'a': 1.0})
# Returns: {'a': 1.0, 'b': 1.0}

print(collection.find_one())
# Returns: {'_id': 1.0, 'subdocument': {'a': 1.0, 'b': 1.0}}

from bson import CodecOptions, SON
opts = CodecOptions(document_class=SON)
CodecOptions(document_class=...SON..., tz_aware=False, uuid_representation=UuidRepresentation.UNSPECIFIED, unicode_decode_error_handler='strict', tzinfo=None, type_registry=TypeRegistry(type_codecs=[], fallback_encoder=None), datetime_conversion=DatetimeConversion.DATETIME)
collection_son = collection.with_options(codec_options=opts)

Exception ignored in: <function Cursor.__del__ at 0x1048129d8>
...
AttributeError: 'Cursor' object has no attribute '_Cursor__killed'
...
TypeError: __init__() got an unexpected keyword argument '<argument>'

unspecified_collection.insert_one({'_id': 'bar', 'uuid': uuid4()})
Traceback (most recent call last):
...
ValueError: cannot encode native uuid.UUID with UuidRepresentation.UNSPECIFIED.
UUIDs can be manually converted to bson.Binary instances using bson.Binary.from_uuid()
or a different UuidRepresentation can be configured. See the documentation for
UuidRepresentation for more information.

explicit_binary = Binary.from_uuid(uuid4(), UuidRepresentation.STANDARD)
unspec_collection.insert_one({'_id': 'bar', 'uuid': explicit_binary})

from datetime import datetime
coll = client.test.dates
cur = coll.find({'dt': {'$gte': datetime.min, '$lte': datetime.max}})

cur = coll.find({}, projection={'dt': False})

[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed

open "/Applications/Python <YOUR PYTHON VERSION>/Install Certificates.command"

$ pypy -m pip install certifi
$ export SSL_CERT_FILE=$(pypy -c "import certifi; print(certifi.where())")

[SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version

$ openssl version

python -c "import requests; print(requests.get('https://www.howsmyssl.com/a/check', verify=False).json()['tls_version'])"

[('SSL routines', 'tls_process_initial_server_flight', 'invalid status response')]

SSL handshake failed: localhost:27017: [SSL: SSLV3_ALERT_HANDSHAKE_FAILURE] sslv3 alert handshake failure (_ssl.c:997)
SSL handshake failed: localhost:27017: EOF occurred in violation of protocol (_ssl.c:997)

2021-06-30T21:22:44.917+0100 E NETWORK  [conn16] SSL: error:1408A0C1:SSL routines:ssl3_get_client_hello:no shared cipher

[SSL: UNSAFE_LEGACY_RENEGOTIATION_DISABLED] unsafe legacy renegotiation disabled

pymongo.errors.ServerSelectionTimeoutError: No servers found yet, Timeout: -0.00202266700216569s, Topology Description: <TopologyDescription id: 63698e87cebfd22ab1bd2ae0, topology_type: Unknown, servers: [<ServerDescription ('localhost', 27017) server_type: Unknown, rtt: None>]>

pymongo.errors.NetworkTimeout: localhost:27017: timed out

pymongo.errors.ExecutionTimeout: operation exceeded time limit, full error: {'ok': 0.0, 'errmsg': 'operation exceeded time limit', 'code': 50, 'codeName': 'MaxTimeMSExpired'}

pymongo.errors.ExecutionTimeout: operation would exceed time limit, remaining timeout:0.00196 <= network round trip time:0.00427

pymongo.errors.WTimeoutError: operation exceeded time limit, full error: {'code': 50, 'codeName': 'MaxTimeMSExpired', 'errmsg': 'operation exceeded time limit', 'errInfo': {'writeConcern': {'w': 1, 'wtimeout': 0}}}

pymongo.errors.BulkWriteError: batch op errors occurred, full error: {'writeErrors': [], 'writeConcernErrors': [{'code': 50, 'codeName': 'MaxTimeMSExpired', 'errmsg': 'operation exceeded time limit', 'errInfo': {'writeConcern': {'w': 1, 'wtimeout': 0}}}], 'nInserted': 2, 'nUpserted': 0, 'nMatched': 0, 'nModified': 0, 'nRemoved': 0, 'upserted': []}