String Concatenation and Memory IDs in Python

This Python program demonstrates string concatenation and memory IDs of strings. It creates three string variables: str1, str2, and str3. The program shows the initial values and memory IDs of str1 and str2.

The program prints the value and memory ID of str1, which is initially set to "Hello".
It then prints the value and memory ID of str2, which is initially set to "World".
The program concatenates str2 to str1 using the += operator, and then prints the updated value of str1 and its memory ID. Note that string concatenation creates a new string object, hence the memory ID of str1 changes after concatenation.
Finally, the program assigns str1 to str3, creating a reference to the same string object. It prints the value and memory ID of str3.

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