function with default values for the arguments in python
def fan_speed(speed = 1 )-> str:
if speed > 5:
return "fan can't go with more speed "
return "The speed of fan is " + str(speed)
print(fan_speed(6))
print(fan_speed(4))
print(fan_speed())#if you don't provide the speed of fan the fan will come
#to its defalt value 1 and the speed of fan will become 1