Unable to read update access DB

[saaketh]

Access DB - Table Name - EMPTBL

Coloumns Names
Sal(with Values),cca(No Values),Hra(No Values),NS(No Values),GS(No Values)

I want to calculate CCA HRA NS GS, based on sal(salary)
and update the table EMPTBL

import pyodbc

conn = pyodbc.connect(r'Driver={Microsoft Access Driver (*.mdb, *.accdb)};DBQ=C:\MyPython\Mydb.accdb;')
cursor = conn.cursor()
Mysal= cursor.execute('select sal from EMPTBL')

if Mysal > 5000:

sql= """ Update EMPTBL SET sal=mysal*.25"""
cursor.execute(sql)
cursor.commit()
conn.close()

Error:
File "C:/MyPython/MyTest.py", line 9
    sql= """ Update EMPTBL SET sal=mysal*.25"""
      ^
IndentationError: expected an indented block

Process finished with exit code 1