Python 3: UnboundLocalError: local variable referenced before assignment

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The following code gives the error UnboundLocalError: local variable "Var1" referenced before assignment:

Var1 = 1
Var2 = 0
def function(): 
    if Var2 == 0 and Var1 > 0:
        print("Result One")
    elif Var2 == 1 and Var1 > 0:
        print("Result Two")
    elif Var1 < 1:
        print("Result Three")
    Var1 =- 1
function()

How can I fix this? Thanks for any help!

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