[Python] Why does Python treat two identical string literals differently when modified inside...

was experimenting with string handling and noticed something confusing.

In the following code, two identical string literals behave differently depending on where they are used:

s1 = "harsh"
s2 = "harsh"

print(s1 is s2) # True (expected: Python interns identical literals)


But when I try something similar inside a loop with string concatenation:

values = []

for i in range(3):
x = "harsh" + ""
values.append(x)

print(all(v is values[0] for v in values))


This prints:

False

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