Python – String Immutability
In python, the string data types are immutable. Which means a string value cannot be updated. We can verify this by trying to update a part of the string which will led us to an error.
# Can not reassign t= "Tutorialspoint" print type(t) t = "M"
When we run the above program, we get the following output −
t = "M" TypeError: 'str' object does not support item assignment
We can further verify this by checking the memory location address of the position of the letters of the string.
. x = 'banana' for idx in range (0,5): print x[idx], "=", id(x[idx])
When we run the above program we get the following output. As you can see above a and a point to same location. Also N and N also point to the same location.
>b = 91909376 a = 91836864 n = 91259888 a = 91836864 n = 91259888