装饰器

# 闭包解释装饰器原理
def decoratorFun(func):
    def checkPermissions():
        print("执行权限检测")
        func()
    return checkPermissions
def proc1():
    print("逻辑处理1")

def proc2():
    print("逻辑处理2")

proc_ret = decoratorFun(proc1)
proc_ret()

def decoratorFun(func):
    def checkPermissions():
        print("执行权限检测")
        func()
    return checkPermissions
@decoratorFun
def proc3():
    print("逻辑处理3")

# 代码执行到装饰器的时候就进行装饰，并不是调用方法的时候才进行装饰
def makeBold(func):
    print("---makebold---")
    def wrapped():
        return "<b>" + func() + "</b>"

    return wrapped


def makeItalic(func):
    print("---makeItalic---")
    def wrapped():
        return "<i>" + func() + "</i>"

    return wrapped


@makeBold
@makeItalic
def getNode():
    print("---getNode---")
    return "Hello World"


nodeRet = getNode()
print(nodeRet)

def func_NoParam(functionName):
    print("---func_NoParam---1---")
    def func_in():
        print("---func_NoParam_in---1---")
        functionName()
        print("---func_NoParam_in---2---")

    print("---func_NoParam---2---")
    return func_in

@func_NoParam
def decorator_NoParam():
    print("----decorator_NoParam----")
decorator_NoParam()

def decorator_Param(func):
    print("---decorator_Param1---")

    def decorator_Param_In(a, b):
        print("---decorator_Param_in1---")
        func(a, b)
        print("---decorator_Param_in2---")

    print("---decorator_Param2---")
    return decorator_Param_In


@decorator_Param
def func_Param(a, b):
    print("---func_Param---")
    print("a：%d，b：%d" % (a, b))


func_Param(8, 9)

def decorator_return(func):
    def dec_return():
        print("---decorator_return_in_1---")
        ret = func()
        print("---decorator_return_in_2---")
        return ret

    return dec_return


@decorator_return
def func_return():
    print("---func_return---")
    return "func_return已执行"


ret_dec_return = func_return()
print(ret_dec_return)

def decorator_general(func):
    def dec_general(*args, **kwargs):
        print("---decorator_general_in_1---")
        ret = func(*args, **kwargs)
        print("---decorator_general_in_2---")
        return ret

    return dec_general


@decorator_general
def func_general(a, b, c):
    print("---a:%d,b:%d,c%d---" % (a, b, c))
    return a + b + c


general_ret = func_general(1, 2, 3)
print("通用装饰器返回值：%d" % general_ret)

def decorator_arg(arg):
    def decorator_arg_func(func):
        def dec_arg_in():
            print("带参装饰器arg:%d" % arg)
            if (arg > 0):
                func()
            else:
                print("arg必须大于零")

        return dec_arg_in

    return decorator_arg_func


@decorator_arg(3)
def func_dec_arg():
    print("带参装饰器已执行")