# swap_vars.py
# A simple script that swaps two variables, with an intentional bug for debugging.
def swap_variables(a, b):
print(f"Initial values: a = {a}, b = {b}")
# Intentionally buggy swap logic for demonstration
# Correct logic would use a temporary variable: temp = a; a = b; b = temp
# Or Python's tuple assignment: a, b = b, a
a = b # Bug: 'a' loses its original value here
b = a # Bug: 'b' gets the new value of 'a' (which is original 'b')
print(f"Swapped values: a = {a}, b = {b}")
return a, b
def main():
x = 10
y = 20
print("Starting variable swap demo...")
swapped_x, swapped_y = swap_variables(x, y)
# Verification
if swapped_x == 20 and swapped_y == 10:
print("Swap successful!")
else:
print(f"Swap NOT successful. Expected x=20, y=10 but got x={swapped_x}, y={swapped_y}")
if __name__ == "__main__":
main()
