df[df.A > 0]      # Using a single column’s values to select data
df[df > 0]        # A where operation for getting.
df2 = df.copy()   # copy data  
df2['E'] = ['one', 'one','two','three','four','three'] 
df2[df2['E'].isin(['two','four'])]  # Using the isin() method for filtering: