from tkinter import *
root = Tk()
root.geometry('250x120')
root.resizable(False, False)
s1 = Scale(root, sliderlength=20, orient=HORIZONTAL, length=180)
s1.place(x=30, y=30)
def sa():
    if s1.get() == 0:
        pass
def main():
    root.mainloop()
    sa()
if __name__ == '__main__':
    main()

Traceback (most recent call last):
  File "C:/Users/123/PycharmProjects/untitled/delete.py", line 14, in <module>
    main()
  File "C:/Users/123/PycharmProjects/untitled/delete.py", line 12, in main
    sa()
  File "C:/Users/123i/PycharmProjects/untitled/delete.py", line 8, in sa
    if s1.get() == 0:
  File "C:\Users\123\AppData\Local\Programs\Python\Python36-32\lib\tkinter\__init__.py", line 3010, in get
    value = self.tk.call(self._w, 'get')
_tkinter.TclError: invalid command name ".!scale"

 def main():
    sa()
    root.mainloop()