Python函数的嵌套详解

def speak(text):
    def my_lower(t):
        return t.lower() + '...'
    return my_lower(text)
print(speak('Aomi'))

def get_speak_fun(volume):
    def my_lower(text):
        return text.lower() + '...'
    def yell(text):
        return text.upper() + '...'
    if volume> 0.5 :
        return yell
    else:
        return my_lower
fun = get_speak_fun(0.8)
print(fun('I am in Aomi'))