def main():
print("Hello Python")
def add_numbers(a, b):
return a + b
class Calculator:
def __init__(self):
self.value = 0.0
def calculate(self, op, val):
if op == '+':
self.value += val
elif op == '-':
self.value -= val
def fibonacci(n):
if n <= 1:
return n
return fibonacci(n-1) + fibonacci(n-2)
if __name__ == "__main__":
main()