How Can Python Strings Be Immutable if \'a \' \' b\' Changes the Value of \'a\'?

Aren't Python Strings Immutable? A Closer Look

Despite the apparent immutability of Python strings, the expression "a " " b" assigns a new value to the variable "a". This seemingly paradoxical behavior requires a deeper understanding of what immutability entails.

Understanding Python String Immutability

Python strings are indeed immutable, meaning their contents cannot be altered. However, variables that reference strings can change the object they point to. When "a" refers to the string "Dog", modifying "a" to include additional characters will result in a new string object being created.

The Enigma of "a " " b"

The expression "a " " b" concatenates the strings pointed to by "a" and "b" and assigns the result to "a". This effectively moves the reference of "a" to a new string object that holds both "Dog" and "eats treats".

Hence, "a" now points to a different string, leaving the original "Dog" string untouched. This is in line with string immutability as the original string was not modified.

To Conclude

Although Python strings are immutable, variables can redirect to different string objects. The expression "a " " b" can appear to mutate "a," but in reality, it assigns a new string object to the variable.

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