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python - How do I execute this function syntax?

def swap_value(x,y):    
    temp = x
    x = y
    y = temp
    return

swap_value(3,4)

I tried it like this. But it didn't work

Solution

  • Your function is not returning anything, so maybe you want to return a tuple like:

    def swap_value(x, y):
    temp = x
    x = y
    y = temp
    return x, y

    Wich is a more verbose way of just doing:

    def swap_value(x, y):
    return y, x

    Problem with the above methods is you're not doing a proper swapping, test below:

    x, y = 3, 4
print(swap_value(x, y))
print(x, y)

    The most pythonic way to swap values in python would be using a simple oneliner, this would be the minimal pythonic way to swap values, no need to wrap swapping into a function (unless the swap did something else):

    x, y = 3, 4
x, y = y, x
print(x, y)