Reading data in python.

    Python provides 2 built in functions to read a line of text from standard input
1] raw_input()
2] input()

1] raw_input() :
                        it is used to read data from the user or from the keyboard.
      it is only supports to the python 2.x versions.
    syntax:
                raw_input("message")
    example:
               we are executing this statement in latest version of python.
    >>> x=raw_input("enter a number")
            Traceback (most recent call last):
            File "<pyshell#0>", line 1, in <module>
            x=raw_input("enter a number")
           NameError: name 'raw_input' is not defined
    >>> 
             raw_input() function is deleted from latest versions of python.

2] input() :
                it is used to read data from the user or from the keyboard.
      it is supported to the python 3.x versions onwards.
   syntax:
               input("message")
   example:
       >>> x=input("enter a number:")
      enter a number:45
       >>> x
        '45'
       >>>