how to get the historical closing price of FRGOV10YZ=R

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df = ld.get_history(universe="FRGOV10YZ=R", fields=['ZERO_YIELD1'], interval='monthly', start=start_date, end=end_date )

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If you remove the fields parameter, you will get all available fields.

df = ld.get_history(universe="FRGOV10YZ=R",
                     #fields=['ZERO_YIELD1'],            
                     interval='monthly',            
                     start='2024-12-31',            
                     end='2025-12-31')


df.columns

The output is:

Index(['MATUR_DATE', 'ZERO_YLD1', 'DISC_FACT', 'START_DT', 'O_DISCFACT',

       'H_DISCFACT', 'L_DISCFACT', 'OPEN_ZYLD', 'HIGH_ZYLD', 'LOW_ZYLD'],

      dtype='object', name='FRGOV10YZ=R')

Therefore, the field should be 'ZERO_YLD1', not 'ZERO_YIELD1'.

df = ld.get_history(universe="FRGOV10YZ=R",
                     fields=['ZERO_YLD1'],            
                     interval='monthly',            
                     start='2024-12-31',            
                     end='2025-12-31')

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