Python递归函数定义与用法

deffact(n):

ifn==1:

  return1

returnn*fact(n-1)

>>> fact(1)

1

>>> fact(5)

120

>>> fact(100)

93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000L

===> fact(5)

===>5*fact(4)

===>5*(4*fact(3))

===>5*(4*(3*fact(2)))

===>5*(4*(3*(2*fact(1))))

===>5*(4*(3*(2*1)))

===>5*(4*(3*2))

===>5*(4*6)

===>5*24

===>120

fact(10000)。

defdigui(n):

  sum=0

  ifn<=0:

    return1

  else:

    returnn*digui(n-1)

print(digui(5))

publicfunctionrules()

{

 return[

  [['name','account','pwd'],'string','max'=> 11],

  ['account','required','message'=>'用户名不能为空'],

  ['pwd','required','message'=>'密码不能为空','on'=>'update']

 ];

}

$model=newUser();

if(isset($_POST['User'])){

 $model-> attributes = Yii::$app->request->post('User');

 $model-> save();

}

publicfunctionscenarios()

{

 return[

  'update'=>['pwd'],//在该场景下的属性进行验证，其他场景和没有on的都不会验证

 ];

}

def go():

  while True:

    data = 1

    r = yield data # data是返回值，r是接收值

    print("data", data)

    print("A1", r)

    data += 1

    r = yield data

    print("data",data)

    r += r

    print("A2", r)

    data += 1

    r = yield data

    print("data",data)

    print("A3", r)

    # 运行时此后若找不到下一个yield，则会报错StopIteration

my = go()

print("my", my)

print("None", my.send(None))

print(my.send("1"))

print(my.send("2"))

print(my.send("3"))

strtotime("now")；

strtotime("10 September 2017")；

strtotime("+1 day")；

strtotime("+1 week")；

strtotime("+1 week 2 days 4 hours 2 seconds")；

strtotime("next Thursday")；

strtotime("last Monday")；

$times= [];

functionmakeTime(){

  //获取今日开始时间戳和结束时间戳

  $beginToday=mktime(0,0,0,date('m'),date('d'),date('Y'));

  $endToday=mktime(0,0,0,date('m'),date('d')+1,date('Y'))-1;

  $times['today']['begin'] =$beginToday;

  $times['today']['end'] =$endToday;

  //获取昨日起始时间戳和结束时间戳

  $beginYesterday=mktime(0,0,0,date('m'),date('d')-1,date('Y'));

  $endYesterday=mktime(0,0,0,date('m'),date('d'),date('Y'))-1;

  $times['yesterday']['begin'] =$beginYesterday;

  $times['yesterday']['end'] =$endYesterday;

  //获取上周起始时间戳和结束时间戳

  $beginLastweek=mktime(0,0,0,date('m'),date('d')-date('w')+1-7,date('Y'));

  $endLastweek=mktime(23,59,59,date('m'),date('d')-date('w')+7-7,date('Y'));

  $times['lastWeek']['begin'] =$beginLastweek;

  $times['lastWeek']['end'] =$endLastweek;

  //获取本月起始时间戳和结束时间戳

  $beginThismonth=mktime(0,0,0,date('m'),1,date('Y'));

  $endThismonth=mktime(23,59,59,date('m'),date('t'),date('Y'));

  $times['thisMonth']['begin'] =$beginThismonth;

  $times['thisMonth']['end'] =$endThismonth;

  //获取本周开始时间和结束时间，此例中开始时间为周一

  $defaultDate=date('Y-m-d');

  $first= 1;

  $w=date('w',strtotime($defaultDate));

  $beginWeek=strtotime("$defaultDate-". ($w?$w-$first:6) .'days');

  $endWeek=$beginWeek+ 6*24*3600-1;

  $times['thisWeek']['begin'] =$beginWeek;

  $times['thisWeek']['end'] =$endWeek;

  //获取上月的起始时间戳和结束时间戳

  $beginLastmonth=mktime(0,0,0,date('m')-1,1,date('Y'));

  $endLastmonth=mktime(23,59,59,date('m')-1,date('t'),date('Y'));

  $times['LastMonth']['begin'] =$beginLastmonth;

  $times['LastMonth']['end'] =$endLastmonth;

  //获取今年的起始时间和结束时间

  $beginThisyear=mktime(0,0,0,1,1,date('Y'));

  $endThisyear=mktime(23,59,59,12,31,date('Y'));

  $times['thisYear']['begin'] =$beginThisyear;

  $times['thisYear']['end'] =$endThisyear;

  //获取上年的起始时间和结束时间

  $beginLastyear=mktime(0,0,0,1,1,date('Y')-1);

  $endLastyear=mktime(23,59,59,12,31,date('Y')-1);

  $times['lastYear']['begin'] =$beginLastyear;

  $times['lastYear']['end'] =$endLastyear;

  //获取本季度开始时间和结束时间

  $season=ceil((date('n'))/3);//当月是第几季度

  $beginThisSeason=mktime(0, 0, 0,$season*3-3+1,1,date('Y'));

  $endThisSeason=mktime(23,59,59,$season*3,date('t',mktime(0, 0 , 0,$season*3,1,date("Y"))),date('Y'));

  $times['thisSeason']['begin'] =$beginThisSeason;

  $times['thisSeason']['end'] =$endThisSeason;

  //获取上季度的起始时间和结束时间

  $beginLastSeason=mktime(0, 0, 0,($season-1)*3-3+1,1,date('Y'));

  $endLastSeason=mktime(23,59,59,($season-1)*3,date('t',mktime(0, 0 , 0,$season*3,1,date("Y"))),date('Y'));

  $times['lastSeason']['begin'] =$beginLastSeason;

  $times['lastSeason']['end'] =$endLastSeason;

  return$times;

}

$times= makeTime();