To specify an octal digit, precede the octal value with a zero, and then a lower or uppercase 'o'. For example, to set the variable 'a' to the octal value '10' (8 in decimal), type: 

>>> a = 0o10 
  >>> a 

  8
Hexadecimal is just as easy. Simply precede the hexadecimal number with a zero, and then a lower or uppercase 'x'. Hexadecimal digits can be specified in lower or uppercase. For example, in the Python interpreter: 
  >>> a = 0xa5 
  >>> a 
  165 
  >>> b = 0XB2 
  >>> b 
  178