A Python String is Immutable

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Thank you so much.. Lots of love from India

a='ab-c'
b='ab-c'
a is b # False
a[0] is b[0], a[1] is b[1], a[2] is b[2], a[3] is b[3] #(True, True, True, True)

May i know the reason?

A good example!

Thank's