PostgreSQL psycopg2.errors.DuplicateColumn: column specified more than once

[rajnish_nationfirst]

I am creating dynamically table in PostgreSQL using psycopg2 by passing the below 2 strings as column names:

'BAF7_X_X_During_soaking-__Temperature__difference_coil_to_coil_with_metal_temp_TC_load_in_PA_load'

and

'BAF7_X_X_During_soaking-__Temperature__difference_coil_to_coil_with_metal_temp_TC_load__in_TA_load'

And the above column names are not same ( both are different columns )

but i am getting errors as

Error:
Traceback (most recent call last):
  File "C:/Users/Administrator/PycharmProjects/untitled/table_creation_with_HDA_Data.py", line 131, in <module>
    cursor.execute(sqlCreateTable)
psycopg2.errors.DuplicateColumn: column "BAF7_X_X_During_soaking-__Temperature__difference_coil_to_coil_" specified more than once

Thanks
Rajnish Vishwakarma