Drawing with Python sea returnees--turtle, drawing ellipse

Everyone must have thought about drawing an ellipse with turtle in Python. After thinking about it for a long time, I finally figured out the ellipse, but I don’t know if this method is the simplest or correct. Please correct me if there is any error. , If you find it easy to use, just use it, hahaha The
code is as follows:

import turtle

def half_a(x):
  a = x
  b = 90
  while True:
    turtle.circle(a, 1)
    a = a - x / 100
    b = b - 1
    if b == 0:
      break

def half_b(x):
  a = x * 0.1
  b = 90
  while True:
    turtle.circle(a, 1)
    a = a + x / 100
    b = b - 1
    if b == 0:
      break

def ellipse(x):
  turtle.speed(0)         #设置画笔速度
  turtle.color("red")      #设置画笔颜色
  turtle.pensize(1)       #设置画笔粗细
  half_a(x)
  half_b(x)
  half_a(x)
  half_b(x)
  turtle.hideturtle()  # 隐藏箭头显示

ellipse(100)        #可根据自己的需要改变这个值
turtle.mainloop()

Operating effect:

If you want to draw an ellipse in another direction, you only need to exchange a piece of code. The
code is as follows:

import turtle

def half_a(x):
  a = x
  b = 90
  while True:
    turtle.circle(a, 1)
    a = a - x / 100
    b = b - 1
    if b == 0:
      break

def half_b(x):
  a = x * 0.1
  b = 90
  while True:
    turtle.circle(a, 1)
    a = a + x / 100
    b = b - 1
    if b == 0:
      break

def ellipse(x):
  turtle.speed(0)         #设置画笔速度
  turtle.color("red")      #设置画笔颜色
  turtle.pensize(1)       #设置画笔粗细
  half_b(x)
  half_a(x)
  half_b(x)
  half_a(x)
  turtle.hideturtle()  # 隐藏箭头显示

ellipse(100)        #可根据自己的需要改变这个值
turtle.mainloop()

running result: