How to make a function that changes initialized coordinates-CodePudding

I'm struggling with making a function that changes the value of the coordinates if the parameters appropriate.

That's what I made:

class Move:
    def __init__(self, x, y):
        self.x = x
        self.y = y


move = Move(5, 5)


def obstacle(axis, value, plus):
    if plus is True:
        if axis == value:
            axis = axis   1
            print(f"x = {move.x}, y = {move.y}")
    elif plus is False:
        if axis == value:
            axis = axis - 1
            print(f"x = {move.x}, y = {move.y}")


obstacle(move.x, 5, False)

The program should print: x = 4, y = 5

CodePudding user response：

What the program is currently doing is running obstacle(), going inside the "if plus is false" block and changing the axis value from 5 to 4, and that's it. To print: x=4, y=5 you can:

Instead of the axis value change the move.x value
Or print the axis value instead of move.x

CodePudding user response：

Here is the code rewritten to work as you expect. But note that as @IBeFrogs implies move is global so you may as well just change it directly.

class Move:
    def __init__(self, x, y):
        self.x = x
        self.y = y


move = Move(5, 5)

def obstacle(inst, value, plus):
    if plus is True:
        if inst.x == value:
            inst.x = inst.x   1
    elif plus is False:
        if inst.x == value:
            inst.x = inst.x - 1
    print(f"x = {move.x}, y = {move.y}")


obstacle(move, 5, False)

CodePudding user response：

Parameters in function only takes the value in variable not the variable. So when you write like this:

axis = axis   1

and

axis = axis - 1

You just change the parameter value axis. Replace the two lines with:

move.x = move.x   1

and

move.x = move.x - 1

And the final code is like this:

class Move:
    def __init__(self, x, y):
        self.x = x
        self.y = y

move = Move(5, 5)
def obstacle(axis, value, plus):
    if plus is True:
        if axis == value:
            move.x = move.x   1
            print(f"x = {move.x}, y = {move.y}")
    elif plus is False:
        if axis == value:
            move.x = move.x - 1
            print(f"x = {move.x}, y = {move.y}")

obstacle(move.x, 5, False)