python基础-函数

定义函数格式：
def 函数名称（参数 = None）:
代码组
其中 参数 = None ，设置默认值可为空

def printHello():
    print('hello world')

def printHelloWithName(name):
    print('hello world! ',name)

def printHell0WithTime(time=None):
    print('hello world ! -',time)

def printStudent(name , age):
    print('name: ', name , 'age: ', age)

def printMyFridend(name = '' , age = 0):
    print("My friden is ",name,' age is ',age)
    return "hah"
printHello()
printHelloWithName("Lily")
printHelloWithName("")

printHell0WithTime("今天")
printHell0WithTime()

printStudent('Lily',12)
printStudent('Lily','14 years old')
printMyFridend('Lucy',12)
printMyFridend('Lucy','13 years old')