Why does comparing strings using either '==' or 'is' sometimes produce a different result?

Question

I've set two variables to the value 'qwerty' in Python. In a conditional expression which fails i.e. var1 is var2 , but when I use var1 == var2 and the output comes True. But in my Python interpreter the same succeeds: >>> s5 = 'public' >>> s6 = 'public' >>> s5 is s6 True Can someone tell me what mistakes I am doing? Select the correct answer from above options

Answer 1

== compares the values whereas is tests for object identity. check this for ref. >>> a = 'qwe' >>> b = ''.join(['q', 'w', 'e']) >>> q == e True >>> q is e False