The turtle module provides turtle graphics primitives, in both object-oriented and procedure-oriented ways. Because it uses Tkinter for the underlying graphics, it needs a version of Python installed with Tk support.
turtle.Screen().turtles()
This function is used to return the list of turtles on the screen. This doesn't require any argument.
Syntax :
turtle.Screen().turtles()
Below is the implementation of the above method with some examples :
Example 1 :
# import package
import turtle
# make screen object
# and set size
sc = turtle.Screen()
sc.setup(400,300)
# make turtle object
t1=turtle.Turtle(shape='square')
# do some motion with properties
t1.color("red")
t1.circle(50)
# make another turtle object
t2=turtle.Turtle(shape='circle')
# do some motion with properties
t2.color("green")
t2.circle(40)
# get all turtle objects on screen
print(sc.turtles())
Output :

[<turtle.Turtle object at 0x000001E90622DAC8>, <turtle.Turtle object at 0x000001E90625CC88>]
Example 2 :
# import package
import turtle
# make screen object and set size
sc = turtle.Screen()
sc.setup(400, 300)
# make first turtle and do something
t1 = turtle.Turtle(shape='square')
t1.color("red")
t1.circle(50)
# make another turtle and do something
t2 = turtle.Turtle(shape='circle')
t2.color("green")
t2.circle(40)
# get all turtles object
turt = sc.turtles()
# use first turtle object
turt[0].circle(-40)
# use another turtle object
turt[1].circle(-50)
Output :