Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license()" for more information.
>>> import turtle
>>> t=turtle.Turtle()
>>> r=int(input("180"))
180
Traceback (most recent call last):
  File "<pyshell#2>", line 1, in <module>
    r=int(input("180"))
ValueError: invalid literal for int() with base 10: ''
>>> col=input("blue")
blue t.fillcolor(col)
>>> t.begin_fill()
>>> t.circle(r)
Traceback (most recent call last):
  File "<pyshell#5>", line 1, in <module>
    t.circle(r)
NameError: name 'r' is not defined
>>> import turtle
>>> t=turtle.Turtle()
>>> r=int(input("180"))
180