1
The traditional method involves using a temporary variable to hold one value while the other is overwritten, preventing data loss.
2
Arithmetic swapping (a = a + b, b = a - b, a = a - b) avoids a third variable but can lead to integer overflow or memory waste because the sum might require more bits than the original numbers.
3
The XOR (^) operator is a more efficient way to swap without a third variable, as it does not require extra bits of memory compared to the arithmetic approach.
4
Python provides a unique, idiomatic syntax for swapping: 'a, b = b, a'. This is the preferred method in Python.
5
Behind the scenes, Python's 'a, b = b, a' syntax utilizes a stack-based rotation mechanism (historically related to the ROT_TWO bytecode instruction) to swap values efficiently without explicit temporary variables in the user code.