iii)String:

     

      String can be defined in three ways :

      using single quotes, double quotes, triple single quotes or Double single

      quotes.

      "String_name" or 'string_name'  are the basic way you can define a string.

      A special provision for writing a multiline string is provided by python

      using three quotes:

      For example : """ I am a multiline comment

                                     Which can be extended for any number of lines

                                              .............

                                              .............

                                      String ends here """

      Or, instead of  """ comment """",  '''  comment  '''    can be used.

       Note : Combination  of quotes cannot be used. Either of the quotes 

type has to be used.

       By default, the string quotes used by python is ' '.

          >>> "python3"

          'python3'

          >>> type(""" I am a

          ... multiline comment

          ... """)

          <class 'str'>

          >>> "hello "+"world"

          'hello world'

      Here, what interpreter has done is not addition of strings but

concatenation of strings. 

Concatenation is appending of one string at the last of another

      string.

      String repetition:

          >>> " I am repeating"*3

          ' I am repeating I am repeating I am repeating'