How to Fix 'Data source name not found and no default driver specified' Error in PYODBC?

Solving the "Data source name not found" PYODBC Connection Error

Connecting to SQL Server databases with PYODBC can sometimes throw a frustrating "Data source name not found and no default driver specified" error. This usually points to an incorrectly configured connection string, specifically a missing or incorrect ODBC driver specification.

Consider this example connection string:

<code class="language-python">import pyodbc
connection = pyodbc.connect('Driver = {SQL Server};Server=SIWSQL43A\SIMSSPROD43A;'
                            'Database=CSM_reporting;Trusted_Connection=yes;')</code>

The problem lies in the vague 'Driver = {SQL Server}' entry. It doesn't specify which SQL Server ODBC driver to use. To fix this, you must explicitly state the driver version.

A successful solution often involves using the ODBC Driver 17 for SQL Server:

<code class="language-python">'DRIVER={ODBC Driver 17 for SQL Server}'</code>

To determine the correct driver version for your system:

1. Search your system's applications or programs list for "ODBC".
2. The installed ODBC drivers will be listed. Note the version number (e.g., "ODBC Driver 17 for SQL Server").

Replace {SQL Server} in your connection string with the precise driver name you found, ensuring the correct version is specified. This precise specification eliminates ambiguity and resolves the "Data source name not found" error.

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