def printInfo():print("人生苦短，我用Python")

def printInfo():print("人生苦短，我用Python")printInfo()

def printInfo(a, b):print(a + b)printInfo("人生苦短", "我用Python")

# 带有默认值的参数一定要位于参数列表的最后面
def printInfo(a, b="我用Python"):return a + b;print(printInfo("人生苦短"))

# 加了星号（*）的变量会存放所有未命名的变量参数，b为元组
def printInfo(a, *b):print(a)print(b)printInfo("人生苦短","我用","Python")# 人生苦短
# ('我用', 'Python')

printInfo("人生苦短")# 人生苦短
# ()

# 加**的变量会存放命名参数，即形如key=value的参数， b为字典。
def printInfo(a, **b):print(a)print(b)printInfo("人生苦短", x="我用", y="Python")# 人生苦短
# {'x': '我用', 'y': 'Python'}

printInfo("人生苦短")# 人生苦短
# {}

def printInfo(a, *b, **c):print(a)print(b)print(c)printInfo("人生苦短", 1, "a", x="我用", y="Python")# 人生苦短
# (1, 'a')
# {'x': '我用', 'y': 'Python'}

printInfo("人生苦短")# 人生苦短
# ()
# {}

def printInfo(a, b):return a + b;print(printInfo("人生苦短", "我用Python"))

# 本质是利用了元组
def printInfo(a, b):return a, b;a, b = printInfo("人生苦短", "我用Python")
print(a, b)

def printInfo(a, *b, **c):print(a)print(b)print(c)a = (1, 'a')
b = {'x': '我用', 'y': 'Python'}printInfo("人生苦短", a, b)# 人生苦短
# ((1, 'a'), {'x': '我用', 'y': 'Python'})
# {}

printInfo("人生苦短", *a, **b)# 人生苦短
# (1, 'a')
# {'x': '我用', 'y': 'Python'}

sum = lambda arg1, arg2: arg1 + arg2
print(sum(10, 20))
# 30# 函数作为参数传递
def fun(a, b, opt):print("a =", a)print("b =", b)print("result =", opt(a, b))
fun(1, 2, lambda x, y: x + y)
# a = 1
# b = 2
# result = 3

stus = [{"name": "zhangsan", "age": 18},{"name": "lisi", "age": 19},{"name": "wangwu", "age": 17}
]
stus.sort(key=lambda x: x['age'])
print(stus)
# [{'name': 'wangwu', 'age': 17}, {'name': 'zhangsan', 'age': 18}, {'name': 'lisi', 'age': 19}]