How do I reset a value in pyhton

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Python

I 'm working with an ev3 robot, I have 2 functions :

<pre>
def Straight(x,y):
    
    if x > 0:
        while robot.distance() <= x:
            correction = (gyro.angle()) * 3
            robot.drive(y,correction)
            
    if x < 0:
        while robot.distance() >= x:
            correction = (gyro.angle()) * 3
            robot.drive(-y,correction)

and

def Phase1():

    Straight(1000,500)
    robot.turn(-360)
    robot.distance() = 0
    Straight(300,500)

When I call the Straight function for the second time "Straight(300,500)" nothing happens because robot.distance() is greater than 300

So my question is, how do I reset the value of robot.distance() ?

Thanks in advance.

What I have tried:

I tried to rewrite the Straight function.