Why is pyodbc throwing an 'IM002' error: Data Source Name Not Found?

Troubleshooting pyodbc's "IM002" Error: Data Source Name Not Found

When connecting to SQL Server using the Python pyodbc library, the error "IM002" – Data Source Name Not Found – often arises. This usually means the ODBC driver specified in your connection string is missing or incompatible.

The solution involves verifying the correct ODBC driver is installed and its version aligns with your connection string. To find your installed ODBC drivers and their versions, search your system's programs or applications list for "ODBC." The list will show available drivers and their version numbers. Choose the driver matching your connection string.

For instance, if you've installed "ODBC Driver 17 for SQL Server," your connection string should reflect this:

<code class="language-python">connection = pyodbc.connect('Driver = {ODBC Driver 17 for SQL Server};Server=SIWSQL43A\SIMSSPROD43A;'
                            'Database=CSM_reporting;Trusted_Connection=yes;')</code>

Correctly specifying the ODBC driver version eliminates the "IM002" error, enabling a successful connection to your SQL Server database from your Python code.

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