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python日期函数udf-程序分享

python日期函数udf-程序分享

作者: yuppy_zyp | 来源:发表于2017-10-31 19:18 被阅读0次

    基于python函数的udf日期处理函数

    1、基于最近在学习python,就是试试用python进行一下的日期处理udf函数的输出,亲测可以上传去到hive中使用。后面开始学习使用python爬虫抓取黄色网页,和试试骗一下阅读量(笑)。最后,再去搞搞算法和机器学习。突然觉得自己搞得挺杂的。没办法,谁叫咱是码农呢?

    2、使用办法-输入什么参数

    这个py文件中包括一堆日期的计算函数。

    其中包括

    3、python上挂

                    1)、先把这堆文件上传到服务器。

                    2)、在使用的时候把python文件加载到缓存中

      add file /home/hive/zyp/python/date.py

                   3)、最后在hive执行的时候,调用这个py函数即可

    SELECT TRANSFORM ('n_day,20171003,3') USING 'python date.py';

    4、逻辑分享

    1)、python udf嵌套

    原本是写成每个日期函数都是一个的,但是后来发现python在本地调用的时候是可以的,但是传上服务器之后就不好使了。这个也是确实的,谁叫别人java的udf都是封装好,需要注册的呢?

    后来想想反正这函数也是写好在这里的需要调用才会用到的,于是干脆把所有函数都打包在一起,通过一个参数来调用了。

    具体实现办法:

    def func(argument,date_p,offset=1,tail='begin'):

    try:

    switcher={

    'week_begin':week_begin(str(date_p),week_num(str(date_p))),

    'week_end':week_end(str(date_p),week_num(str(date_p))),

    'week_num':week_num(str(date_p)),

    'month_begin':month_begin(str(date_p)),

    'month_end':month_end(str(date_p)),

    'quarter_begin':quarter_begin(str(date_p)),

    'quarter_end':quarter_end(str(date_p)),

    'n_day':n_day(str(date_p),offset),

    'n_week':n_week(str(date_p),int(offset)*7),

    'n_month':n_month(str(date_p),offset,tail),

    'n_quarter':n_quarter(str(date_p),offset,tail),

    }

    func=switcher.get(argument)

    return func

    except:

    return None

    2)、参数补全

    把东西都打包到一起之后就又发现问题了,有写函数不需要这么多参数啊。一旦你执行这些不需要那么多参数的函数的时候。硬硬的去取参数会导致报错的。

    所以试了挺久,想到一个解决办法,不知道是不是最好实现了。办法就是给他补字段呗。

    代码如下:

    tempList = ['1', 'begin']

    for line in sys.stdin:

    day_p = line.strip().split(',')

    if day_p[1][4]=='-':

    date_p=(day_p[1][0:4])+(day_p[1][5:7])+(day_p[1][8:11])

    else:

    date_p=day_p[1]

    day_p.extend(tempList[-int(4-len(day_p)%4):])

    day_list=day_p[0:4]

    print func(str(day_list[0]),date_p,day_list[2],day_list[3])

    中间还有一段处理日期带杠的代码。

    3)、程序源码

    #!/home/tops/bin/python

    import calendar

    import math

    import sys

    import datetime

    #test=['n_day,20171003,3','week_begin,2017-10-05','week_num,2017-01-23','month_begin,2017-12-24','month_end,2017-09-30','quarter_begin,2017-10-05,5,begin','quarter_end,2017-01-23,-7,begin','n_day,20171224,8,begin','n_week,2017-09-30,3,begin','n_month,2017-10-05,5,begin','n_quarter,2017-01-23,-7,begin']

    def week_end(day_p,week_num):

    try:

    return n_day(str(day_p),(7-int(week_num)))

    except:

    return None

    def week_begin(day_p,week_num):

    try:

    return n_day(str(day_p),-(int(week_num)%7))

    except:

    return None

    def week_num(day_p):

    try:

    day_str = day_p[0:4]+'-'+day_p[4:6]+'-'+day_p[6:8]

    day_before = datetime.datetime.strptime(day_str, '%Y-%m-%d')

    return day_before.weekday()+1

    except:

    return None

    def month_begin(day_p):

    try:

    return day_p[0:4]+'-'+day_p[4:6]+'-'+'01'

    except:

    return None

    def month_end(day_p):

    try:

    monthRange = calendar.monthrange(int(day_p[0:4]),int(day_p[4:6]))

    return day_p[0:4]+'-'+day_p[4:6]+'-'+str(monthRange[1])

    except:

    return None

    def quarter_begin(day_p):

    try:

    Quarter_begin='0'+str(int(int(day_p[4:6])/3.1)*3+1)

    return str(day_p[0:4])+'-'+str(Quarter_begin[-2:])+'-'+'01'

    except:

    return None

    def quarter_end(day_p):

    try:

    Quarter_end='0'+str((int(int(day_p[4:6])/3.1)+1)*3)

    return month_end(str(day_p[0:4])+str(Quarter_end[-2:])+str('01'))

    except:

    return None

    def n_day(day_p,offset):

    try:

    day_str = day_p[0:4]+'-'+day_p[4:6]+'-'+day_p[6:8]

    day_before = datetime.datetime.strptime(day_str, '%Y-%m-%d')

    day_after = datetime.timedelta(days=int(offset))

    n_days = day_before + day_after

    return n_days.strftime('%Y-%m-%d')

    except:

    return None

    def n_week(day_p,offset):

    try:

    date_p=week_begin(day_p,week_num(day_p))

    date_p1=str(date_p[0:4]+date_p[5:7]+date_p[8:11])

    return n_day(str(date_p1),int(offset)*7)

    except:

    return None

    def n_month(day_p,offset,tail):

    try:

    year_m=int(day_p[0:4])+(int(offset)/12)

    month_m='0'+str(int((int(day_p[4:6])+int(offset))%12))

    if month_m=='00':month_m=12

    if tail=='begin':

    day_m='01'

    else:

    monthRange=calendar.monthrange(int(year_m),int(month_m))

    day_m=str(monthRange[1])

    return str(year_m)+'-'+str(month_m)[-2:]+'-'+str(day_m)

    except:

    return None

    def n_quarter(day_p,offset,tail):

    try:

    date_p=quarter_begin(day_p)

    return n_month(date_p,int(offset)*3,tail)

    except:

    return None

    def func(argument,date_p,offset=1,tail='begin'):

    try:

    switcher={

    'week_begin':week_begin(str(date_p),week_num(str(date_p))),

    'week_end':week_end(str(date_p),week_num(str(date_p))),

    'week_num':week_num(str(date_p)),

    'month_begin':month_begin(str(date_p)),

    'month_end':month_end(str(date_p)),

    'quarter_begin':quarter_begin(str(date_p)),

    'quarter_end':quarter_end(str(date_p)),

    'n_day':n_day(str(date_p),offset),

    'n_week':n_week(str(date_p),int(offset)*7),

    'n_month':n_month(str(date_p),offset,tail),

    'n_quarter':n_quarter(str(date_p),offset,tail),

    }

    func=switcher.get(argument)

    return func

    except:

    return None

    def main():

    try:

    tempList = ['1', 'begin']

    for line in sys.stdin:

    day_p = line.strip().split(',')

    if day_p[1][4]=='-':

    date_p=(day_p[1][0:4])+(day_p[1][5:7])+(day_p[1][8:11])

    else:

    date_p=day_p[1]

    day_p.extend(tempList[-int(4-len(day_p)%4):])

    day_list=day_p[0:4]

    print func(str(day_list[0]),date_p,day_list[2],day_list[3])

    except:

    return None

    if __name__ == "__main__":

    main()

    '''

    作者:张宇鹏

    简书:http://www.jianshu.com/p/5c70d4ade0df

    博客园:http://www.cnblogs.com/Yuppy-Lotr/

    欢迎转载使用。不要改作者名就行。

    '''

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