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def switcher(func_name, val1, val2):

    functions   = {
        "Add"       : Add,
        "Subtract"  : Subtract,
        "Multiply"  : Multiply,
        "Divide"    : Divide
    }

    active_function = functions.get(func_name)
    result          = active_function(val1, val2)

    return result

def Add(val1, val2):
    sum_val     = val1 + val2
    return sum_val

def Subtract(val1, val2):
    sum_val     = val1 - val2
    return sum_val

def Multiply(val1, val2):
    sum_val     = val1 * val2
    return sum_val

def Divide(val1, val2):
    sum_val     = val1 / val2
    return sum_val


print( switcher("Subtract", 1, 2) )