"[unixODBC][Driver Manager]Data source name not found, and no default driver specified" despite /etc/odbc.ini having the DSN

Question

Getting the "[unixODBC][Driver Manager]Data source name not found, and no default driver specified" despite /etc/odbc.ini having the DSN referenced in the connection string. Why would this be happening and what can be done?

Trying to set up pyodbc for connecting to MSSQLServer using the docs (centos 7). Yet, when trying to actually connect to the database,

import pyodbc 

# setup db connection
server = 'myserver' 
database = 'mydb' 
username = 'myusername' 
password = 'mypassword' 
cnxn_str = 'DSN=MyMSSQLServer;DATABASE='+database+'UID='+username+'PWD='+password+'MultipleActiveResultSets=True;'
cnxn = pyodbc.connect(cnxn_str)

getting error "[unixODBC][Driver Manager]Data source name not found, and no default driver specified", even though when running:

[mapr@mnode01 ~]$ cat /etc/odbc.ini
[MyMSSQLServer] Driver=ODBC Driver 13 for SQL Server
Description=My MS SQL Server
Trace=No
Server=<now using my sql server ip>

I can see that the DSN that I referenced in the python code is recorded in the /etc/odbc.ini file. Does anyone know what could be going on here? Thanks.

Note: I initially ran the pyodbc setup exactly as specified in the docs, but later re-did this step to use the ip address of the sql server I wanted to connect to:

vi /home/user/odbcadd.txt

[MyMSSQLServer] Driver = ODBC Driver 13 for SQL Server

Description = My MS SQL Server

Trace = No

Server = <my sql server ip>

and just re-ran the write to odbc.ini:

sudo odbcinst -i -s -f /home/user/odbcadd.txt -l

Answer 1

用户Gord Thompson评论的解决方案解决了我的问题。该~/odbcadd.txt文件，我用填充/etc/odbc.ini文件需要有“驱动程序=”从DSN看起来像一个单独的一行行：

[mapr@mnode01 ~]$ cat /etc/odbc.ini 
[MyMSSQLServer]
Driver=ODBC Driver 13 for SQL Server
Description=My MS SQL Server
Trace=No
Server=172.18.4.38