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Which statement about Python string immutability is correct?

A Strings cannot be modified in place; operations return new strings
B Strings can be modified by index assignment
C Strings are mutable in Python 3
D Only f-strings are immutable

Answer

Strings cannot be modified in place; operations return new strings

Building a string by repeated concatenation in a loop is therefore O(n squared). Use str.join() on a list instead.

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