Why does comparing strings using either '==' or 'is' sometimes produce a different result?

When comparing strings using the '==' operator, the comparison is based on the actual characters in the string. For example:

string1 = "Hello"
string2 = "Hello"
string3 = "hello"

print(string1 == string2) # True
print(string1 == string3) # False

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On the other hand, when comparing strings using the 'is' operator, the comparison is based on the memory addresses of the strings. This means that if two strings are identical in terms of the characters they contain but are stored in different memory locations, they will be considered different when using the 'is' operator.

For example:

string1 = "Hello"
string2 = "Hello"
string3 = "".join(["H", "e", "l", "l", "o"])

print(string1 is string2) # True
print(string1 is string3) # False

In this example, both string1 and string2 contain the same characters, but string3 is created by joining individual characters together, so it is stored in a different memory location. Therefore, even though string1 and string3 are identical in terms of their characters, they are considered different when using the 'is' operator.