May be its an issue , as Strings are immutable

[kunalrai1005]

Crash report

What happened?

Question1 = first_str="hello"
second_str="hell"
second_str="hell"+'o'

print(first_str is second_str)
Answer 1 = True

**Question2 =**first_str="hello"
second_str="hell"
second_str+='o'

Answer 2 print(first_str is second_str)

If strings are immutable then both results should be false , sinece + also make another string

CPython versions tested on:

3.9

Operating systems tested on:

No response

Output from running 'python -VV' on the command line:

No response

[srinivasreddy]

1. Python optimises and interns small strings. That is why both first_str and second_str refer to the same memory location.
2. Unlike the operator +, the operator += does not guarantee the string interning. That is the reason both refer to different locations in memory.

[graingert]

This is not an issue with cpython, the behavior of is is implementation defined. Eg this program may run differently on PyPy

[terryjreedy]

Please ask questions like this on https://discuss.python.org/c/help/7, where answers are more likely found by others.

[kunalrai1005]

Thank you so much for the clarification and guidance