How to automaticaly check python source code for errors

from graphics import *

def main():

 win = GraphWin("Line", 150, 100)
 line= Line(Point(150,100))
 line.draw(win)
 win.getMouse() # pause for click in window
 win.close()

main()

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How can i automatically check my Python code for errors.

Utilities for checking the code and finding bugs, including information about debuggers, etc...