df_features=df[['Revenue (in 000s USD)', 'Revenue Range (in USD)', 'Est. Marketing Department Budget (in 000s USD)', 'Est. Finance Department Budget (in 000s USD)', 'Est. IT Department Budget (in 000s USD)', 'Est. HR Department Budget (in 000s USD)', 'Certified Active Company', 'Total Funding Amount (in 000s USD)', 'Recent Funding Amount (in 000s USD)', 'Number of Locations'"]] how to fix the error: ^ SyntaxError: unterminated string literal (detected at line 1)