str represents String data type.  A String is a sequence of characters enclosed within single quotes or double quotes.

 s1='durga'  s1="durga"  By using single quotes or double quotes we cannot represent multi line string literals.

 s1="durga soft"

 For this requirement we should go for triple single quotes(''') or triple double quotes(""")

 s1='''durga soft'''

 s1="""durga soft"""

 We can also use triple quotes to use single quote or double quote in our String.  ''' This is " character''' ' This i " Character '

 We can embed one string in another string  '''This "Python class very helpful" for java students'''