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Turtle

 
# Drawing in Python
#
# Create a window with small arrow ...
# that represents the turtle.
#
# To move the turtle forward use fd() method.
# The argument of fd is in pixels, for lt() and rt() in degrees.

import turtle

bob = turtle.Turtle()
print(bob)

bob.fd(100) # pixels
bob.lt(90) # degrees
bob.fd(100)

turtle.mainloop()

 
# Square draw
# 
# Draw a square using turtle module

import turtle
bob = turtle.Turtle()
print(bob)

bob.fd(100)

bob.lt(90)
bob.fd(100)

bob.lt(90)
bob.fd(100)

bob.lt(90)
bob.fd(100) 

turtle.mainloop()

Loop

 
# Square draw - using loop
#
# The syntax of a for statement is similar to a function definition.
# The flow of execution runs through body and then loops back to the top.

import turtle

bob = turtle.Turtle()
print(bob)

for i in range(4):
    bob.fd(100) # pixels
    bob.lt(90) # degrees

turtle.mainloop()