I am executing the query using pymysql in python. 

select (sum(acc_Value)) from accInfo where acc_Name = 'ABC'

The purpose of the query is to get the sum of all the values in acc_Value column for all the rows matchin acc_Name = 'ABC'.
The output i am getting when using cur.fetchone() is 

(Decimal('256830696'),)

Now how to get that value "256830696" alone in python. 
Thanks in advance.
It's a tuple, just take the 0th index
pymysql - Get value from a query