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Python contains several built-in functions to convert values from one data type to another data type.
The int function takes string and coverts it to an integer.
>>>s = "1234" # s is string
>>>i = int(s) # string converted to int
>>>print i+2
-------------------------
1236
The float function converts strings into float number.
>>>s = "1234.22" # s is string
>>>i = float(s) # string converted to float
>>>print i
-------------------------
1234.22

The module that is used to write and read the binary data is known as struct. This module allows the functionality and with it many functionalities to be used that consists of the string class. This class contains the binary data that is in the form of numbers that gets converted in python objects for use and vice versa. The program can read or write the binary data is:
import struct
f = open(file-name, "rb")
# This Open() method allows the file to get opened in binary mode to make it portable for # use.
s = f.read(8)
x, y, z = struct.unpack(">hhl", s)
The ‘>” is used to show the format string that allows the string to be converted in big-endian data form. For homogenous list of data the array module can be used that will allow the data to be kept more organized fashion.

Python can convert any value to a string by making use of two functions repr() or str().
The str() function returns representations of values which are human-readable, while repr() generates representations which can be read by the interpreter.
repr() returns a machine-readable representation of values, suitable for an exec command.
Following code sniipets shows working of repr() & str() :

A cookie is an arbitrary string of characters that uniquely identify a session.
Each cookie is specific to one Web site and one user.
The Cookie module defines classes for abstracting the concept of cookies. It contains following method to creates cookie
Cookie.SimpleCookie([input])
Cookie.SerialCookie([input]
Cookie.SmartCookie([input])
for instance following code creates a new cookie ck-
import Cookie
ck= Cookie.SimpleCookie ( x )