Why won't the turtles move together?

I have spent hours today trying to write a computer programme which moves 4 turtles together, from specific places, whilst keeping in a square shape when you connect all of the points. But weird things keep happening, they start by all moving together but they get to a point where they all start to move apart again, then begin creating weird patterns which appear to be random. I am not very experienced in using python so I would appreciate some help. Thanks.

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from turtle import *
from math import*

ant1 = Turtle()
ant2 = Turtle()
ant3 = Turtle()
ant4 = Turtle()
ant1.pencolor("yellow")
ant2.pencolor("red")
ant3.pencolor("black")
ant4.pencolor("pink")
def start():
    ant1.penup()
    ant2.penup()
    ant3.penup()
    ant4.penup()
    ant1.forward(100)
    ant1.left(180)
    ant2.left(90)
    ant2.forward(100)
    ant2.left(90)
    ant2.left(180)
    ant3.left(90)
    ant4.forward(100)
    ant4.left(90)
    ant4.forward(100)
    ant4.left(180)
start()

ant1.pendown()
ant2.pendown()
ant3.pendown()
ant4.pendown()
ant1.width(5)
ant2.width(5)
ant3.width(5)
ant4.width(5)
ant1.speed(20)
ant2.speed(20)
ant3.speed(20)
ant4.speed(20)

for i in range (100000000):
    difference13 = ant1.pos() - ant3.pos()
    angle13 = atan(difference13[1] / difference13[0])
    ant1.left(angle13)
    ant1.forward(1)

    difference32 = ant3.pos() - ant2.pos()
    angle32 = atan(difference32[0] / difference32[1])
    ant3.right(angle32)
    ant3.forward(1)

    difference24 = ant2.pos() - ant4.pos()
    angle24 = atan(difference24[1] / difference24[0])
    ant2.left(angle24)
    ant2.forward(1)

    difference41 = ant4.pos() - ant1.pos()
    angle41 = atan(difference41[0] / difference41[1])
    ant4.right(angle41)
    ant4.forward(1)

Note by Malachi Hibbins
7 months ago

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