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What's the minimum amount of priviliges required to interact with a mysql database using python mysql connector?

I've created a custom user by executing:
mysql> CREATE USER 'myuser'#'localhost' IDENTIFIED BY 'mypwd';
mysql> GRANT select, update, alter ON mydb.* TO myuser#localhost;
My user only needs to read data from the database, update entries and change a few table's structure using the ALTER command.
Now I want to execute the following script:
import mysql.connector
db = mysql.connector.connect(
host="localhost",
user="myuser",
passwd="mypwd",
database="mydb")
print(db);
I don't fully understand why, but following error occurrs:
Traceback (most recent call last):
File "conneciton.py", line 3, in <module>
weewxDb = mysql.connector.connect(
File "/usr/lib/python3/dist-packages/mysql/connector/__init__.py", line 173, in connect
return MySQLConnection(*args, **kwargs)
File "/usr/lib/python3/dist-packages/mysql/connector/connection.py", line 102, in __init__
self.connect(**kwargs)
File "/usr/lib/python3/dist-packages/mysql/connector/abstracts.py", line 735, in connect
self._open_connection()
File "/usr/lib/python3/dist-packages/mysql/connector/connection.py", line 250, in _open_connection
self._do_auth(self._user, self._password,
File "/usr/lib/python3/dist-packages/mysql/connector/connection.py", line 172, in _do_auth
self._auth_switch_request(username, password)
File "/usr/lib/python3/dist-packages/mysql/connector/connection.py", line 216, in _auth_switch_request
raise errors.get_exception(packet)
mysql.connector.errors.ProgrammingError: 1044 (42000): Access denied for user 'myuser'#'localhost' to database 'mydb'
I think my user is missing some privileges. But which? I want to give him as few permissions as possible.

How do I install GNUHealth?

I am following the installation steps mentioned below but have encountered a python problem.
https://en.wikibooks.org/wiki/GNU_Health/Installation#Installing_GNU_Health_on_GNU/Linux_and_FreeBSD
At the step where the initialisation of the database instance is to be performed, I have encountered the following error after executing the following command.
python3 ./trytond-admin --all --database=health
Error encountered:
Traceback (most recent call last):
File "./trytond-admin", line 21, in <module>
admin.run(options)
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-4.6.18/trytond/admin.py", line 24, in run
with Transaction().start(db_name, 0, _nocache=True):
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-4.6.18/trytond/transaction.py", line 88, in start
database = Database(database_name).connect()
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-4.6.18/trytond/backend/postgresql/database.py", line 97, in __new__
**cls._connection_params(name))
File "/home/gnuhealth/.local/lib/python3.6/site-packages/psycopg2/pool.py", line 161, in __init__
self, minconn, maxconn, *args, **kwargs)
File "/home/gnuhealth/.local/lib/python3.6/site-packages/psycopg2/pool.py", line 58, in __init__
self._connect()
File "/home/gnuhealth/.local/lib/python3.6/site-packages/psycopg2/pool.py", line 62, in _connect
conn = psycopg2.connect(*self._args, **self._kwargs)
File "/home/gnuhealth/.local/lib/python3.6/site-packages/psycopg2/__init__.py", line 126, in connect
conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: fe_sendauth: no password supplied
Can anyone help me out with this error or tell me what I am missing?
Based on the error, I suspect that there's a difficulty in connecting to the DB as there is no password specified.

It seems that you did not configured the URI with the credentials to connect to the database. You can find the description of the configuration file at http://docs.tryton.org/projects/server/en/latest/topics/configuration.html#uri
Once you have a configuration file, you must run the command like this:
python3 ./trytond-admin --all --database=health -c /path/to/trytond.conf

Does neo4j desktop include a usable neo4j database

I have installed neo4j desktop and I am able to use neo4j database from it. The problem is when I try to connect to neo4j database from a Django project.
I have configured my settings.py with config.DATABASE_URL = 'bolt://neo4j:neo4j#localhost:7687', but when I run neomodel_install-labels, I get this error:
Connecting to bolt://neo4j:neo4j#localhost:7687
Traceback (most recent call last):
File "/Users/hugovillalobos/Documents/Code/AttractoraProject/AttractoraVenv/lib/python3.6/site-packages/neo4j/bolt/connection.py",
line 578, in _connect
s.connect(resolved_address)
ConnectionRefusedError: [Errno 61] Connection refused
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/Users/hugovillalobos/Documents/Code/AttractoraProject/AttractoraVenv/bin/neomodel_install_labels", line 67, in <module>
main()
File "/Users/hugovillalobos/Documents/Code/AttractoraProject/AttractoraVenv/bin/neomodel_install_labels", line 62, in main
db.set_connection(bolt_url)
File "/Users/hugovillalobos/Documents/Code/AttractoraProject/AttractoraVenv/lib/python3.6/site-packages/neomodel/util.py", line 65,
in set_connection
max_pool_size=config.MAX_POOL_SIZE)
File "/Users/hugovillalobos/Documents/Code/AttractoraProject/AttractoraVenv/lib/python3.6/site-packages/neo4j/v1/api.py", line 94,
in driver
return Driver(uri, **config)
File "/Users/hugovillalobos/Documents/Code/AttractoraProject/AttractoraVenv/lib/python3.6/site-packages/neo4j/v1/api.py", line 133,
in __new__
return subclass(uri, **config)
File "/Users/hugovillalobos/Documents/Code/AttractoraProject/AttractoraVenv/lib/python3.6/site-packages/neo4j/v1/direct.py", line 7
3, in __new__
pool.release(pool.acquire())
File "/Users/hugovillalobos/Documents/Code/AttractoraProject/AttractoraVenv/lib/python3.6/site-packages/neo4j/v1/direct.py", line 4
4, in acquire
return self.acquire_direct(self.address)
File "/Users/hugovillalobos/Documents/Code/AttractoraProject/AttractoraVenv/lib/python3.6/site-packages/neo4j/bolt/connection.py",
line 453, in acquire_direct
connection = self.connector(address, self.connection_error_handler)
File "/Users/hugovillalobos/Documents/Code/AttractoraProject/AttractoraVenv/lib/python3.6/site-packages/neo4j/v1/direct.py", line 7
0, in connector
return connect(address, security_plan.ssl_context, error_handler, **config)
File "/Users/hugovillalobos/Documents/Code/AttractoraProject/AttractoraVenv/lib/python3.6/site-packages/neo4j/bolt/connection.py",
line 707, in connect
raise last_error
File "/Users/hugovillalobos/Documents/Code/AttractoraProject/AttractoraVenv/lib/python3.6/site-packages/neo4j/bolt/connection.py",
line 697, in connect
s = _connect(resolved_address, **config)
File "/Users/hugovillalobos/Documents/Code/AttractoraProject/AttractoraVenv/lib/python3.6/site-packages/neo4j/bolt/connection.py",
line 587, in _connect
raise ServiceUnavailable("Failed to establish connection to {!r} (reason {})".format(resolved_address, error.errno))
neo4j.exceptions.ServiceUnavailable: Failed to establish connection to ('::1', 7687, 0, 0) (reason 61)
I know the database is running because I can connect from neo4j desktop, and I have installed neo4j-driver and neomodel. I don't know what I am missing.

Ok, I don't know if this apply to any case, and I don't know the reason for it, but I found that it was a matter of spacial characters in the password. I set my password with an exclamation character, and when I was trying to connect, it failed. I changed the password for the user in Neo4j removing the exclamation character and Bingo! I got a connection. Can anybody tell my why this happens?

Authentication failed to connect to mongodb using pymongo

We have written a piece of code in python script using pymongo that connects to mongodb.
username = 'abc'
password = 'xxxxxx'
server = 'dns name of that server'
port = 27017
In program, the code looks like:
import pymongo
from pymongo import MongoClient
client = MongoClient(url, serverSelectionTimeoutMS=300)
database = client.database_name
data_insert = database.collection_name.insert_one({'id': 1, 'name': xyz})
When I tried to do these operations, it raises an error:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.7/dist-packages/pymongo/cursor.py", line 1114, in next
if len(self.__data) or self._refresh():
File "/usr/local/lib/python2.7/dist-packages/pymongo/cursor.py", line 1036, in _refresh
self.__collation))
File "/usr/local/lib/python2.7/dist-packages/pymongo/cursor.py", line 873, in __send_message
**kwargs)
File "/usr/local/lib/python2.7/dist-packages/pymongo/mongo_client.py", line 905, in _send_message_with_response
exhaust)
File "/usr/local/lib/python2.7/dist-packages/pymongo/mongo_client.py", line 916, in _reset_on_error
return func(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/pymongo/server.py", line 99, in send_message_with_response
with self.get_socket(all_credentials, exhaust) as sock_info:
File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__
return self.gen.next()
File "/usr/local/lib/python2.7/dist-packages/pymongo/server.py", line 168, in get_socket
with self.pool.get_socket(all_credentials, checkout) as sock_info:
File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__
return self.gen.next()
File "/usr/local/lib/python2.7/dist-packages/pymongo/pool.py", line 792, in get_socket
sock_info.check_auth(all_credentials)
File "/usr/local/lib/python2.7/dist-packages/pymongo/pool.py", line 512, in check_auth
auth.authenticate(credentials, self)
File "/usr/local/lib/python2.7/dist-packages/pymongo/auth.py", line 470, in authenticate
auth_func(credentials, sock_info)
File "/usr/local/lib/python2.7/dist-packages/pymongo/auth.py", line 450, in _authenticate_default
return _authenticate_scram_sha1(credentials, sock_info)
File "/usr/local/lib/python2.7/dist-packages/pymongo/auth.py", line 201, in _authenticate_scram_sha1
res = sock_info.command(source, cmd)
File "/usr/local/lib/python2.7/dist-packages/pymongo/pool.py", line 419, in command
collation=collation)
File "/usr/local/lib/python2.7/dist-packages/pymongo/network.py", line 116, in command
parse_write_concern_error=parse_write_concern_error)
File "/usr/local/lib/python2.7/dist-packages/pymongo/helpers.py", line 210, in _check_command_response
raise OperationFailure(msg % errmsg, code, response)
pymongo.errors.OperationFailure: Authentication failed.
In MongoDB, while performing queries we are getting the responses normally, without raising any errors.

Because the other answers to your question didn't work for me, I'm going to copy and paste my answer from a similar question.
If you've tried the above answers and you're still getting an error:
pymongo.errors.OperationFailure: Authentication failed.
There's a good chance you need to add ?authSource=admin to the end of your uri.
Here's a working solution that I'm using with MongoDB server version 4.2.6 and MongoDB shell version v3.6.9.
from pymongo import MongoClient
# Replace these with your server details
MONGO_HOST = "XX.XXX.XXX.XXX"
MONGO_PORT = "27017"
MONGO_DB = "database"
MONGO_USER = "admin"
MONGO_PASS = "pass"
uri = "mongodb://{}:{}#{}:{}/{}?authSource=admin".format(MONGO_USER, MONGO_PASS, MONGO_HOST, MONGO_PORT, MONGO_DB)
client = MongoClient(uri)
Similar fix for command line is adding --authenticationDatabase admin

Well, I have been stuck with the same error for almost 3-4 hours. I came across solution with the following steps:
from your shell connect to MongoDB by typing: mongo
afterwards, create a database: use test_database
Now create a user with the following command with readWrite and dbAdmin privileges.
db.createUser(
{
user: "test_user",
pwd: "testing12345",
roles: [ "readWrite", "dbAdmin" ]
}
);
This will prompt Successfully added user: { "user" : "test_user", "roles" : [ "readWrite", "dbAdmin" ] }
you can check by typing: show users.
It will also show you DB name you created before in the json.
now you should be able to insert data to your database:
client = MongoClient("mongodb://test_user:myuser123#localhost:27017/test_database")
db = client.test_database
data = {"initial_test":"testing"}
db["my_collection"].insert_one(data).inserted_id

I ran into this error, and my problem was with the password.
I had what I believe to be a special character in the Master account. Changing the password to be only alphanumeric fixed it for me.
Code snippet
client = pymongo.MongoClient(
'mongodb://username:alphaNumericPassword#localhost:27017/?ssl=true&ssl_ca_certs=rds-combined-ca-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false'
)
# Specify the database to be used
db = client['prod-db']

Python - Cannot connect Python to MongoDB

I'm using Python 3.4 the latest version of MongoDB and already installed pymongo using
pip install pymongo
When I run this .py file
from pymongo import MongoClient
if __name__ == "__main__":
con = MongoClient()
db = con.test_database
people = db.people
people.insert({'name':'Mike', 'food':'cheese'})
people.insert({'name':'John', 'food':'ham', 'location':'UK'})
people.insert({'name':'Michelle', 'food':'cheese'})
peeps = people.find()
print("INSERT & FIND TEST")
for person in peeps:
print(person)
I got this error:
Traceback (most recent call last):
File "C:/Users/Alberto/Documents/Python/Kivy/Code/testmongo.py", line 10, in <module>
people.insert({'name':'Mike', 'food':'cheese'})
File "C:\Python34\lib\site-packages\pymongo\collection.py", line 2197, in insert
with self._socket_for_writes() as sock_info:
File "C:\Python34\lib\contextlib.py", line 59, in __enter__
return next(self.gen)
File "C:\Python34\lib\site-packages\pymongo\mongo_client.py", line 712, in _get_socket
server = self._get_topology().select_server(selector)
File "C:\Python34\lib\site-packages\pymongo\topology.py", line 142, in select_server
address))
File "C:\Python34\lib\site-packages\pymongo\topology.py", line 118, in select_servers
self._error_message(selector))
pymongo.errors.ServerSelectionTimeoutError: localhost:27017: [WinError 10061] No connection could be made because the target machine actively refused it
Anyone know how to fix this?

if you are using Local Mongodb
myclient = pymongo.MongoClient('mongodb://<yourUsername>:<yourPassword>#<IPAddress>:27017/<yourDB>?retryWrites=true&w=majority')
If you are using Atlas Mongodb
myclient = pymongo.MongoClient('mongodb+srv://<yourUsername>:<yourPassword>#<YourCluster>.mongodb.net/<yourDB>?retryWrites=true&w=majority')

Just try to replace the connection with the following line.
con = MongoClient('localhost', 27017)
It works fine for me.