python之如何使 rp 和 xrange 动态

嘿伙计们，非常感谢你花时间看我的问题，我已经在这段代码上工作了大约 1 周(我是编码新手，也是 python 1 周)目前只有 x in xrange 时循环才有效(x) 和 'rp':'x' 是此 xml 中可用的正确行数。 xml全天更新，我想知道是否有人可以提供使x动态化的解决方案？

import mechanize 
import urllib 
import json 
import re 
from sched import scheduler 
from time import time, sleep 
 
from sched import scheduler 
from time import time, sleep 
 
s = scheduler(time, sleep) 
 
def run_periodically(start, end, interval, func): 
event_time = start 
while event_time < end: 
    s.enterabs(event_time, 0, func, ()) 
    event_time += interval 
s.run() 
 
def getData():   
post_url = "urlofinterest_xml" 
browser = mechanize.Browser() 
browser.set_handle_robots(False) 
browser.addheaders = [('User-agent', 'Firefox')] 
 
######These are the parameters you've got from checking with the aforementioned tools 
parameters = {'page' : '1', 
              'rp' : '8', 
              'sortname' : 'roi', 
              'sortorder' : 'desc' 
             } 
#####Encode the parameters 
data = urllib.urlencode(parameters) 
trans_array = browser.open(post_url,data).read().decode('UTF-8') 
 
xmlload1 = json.loads(trans_array) 
pattern1 = re.compile('>&nbsp;&nbsp;(.*)<') 
pattern2 = re.compile('/control/profile/view/(.*)\' title=') 
pattern3 = re.compile('<span style=\'font-size:12px;\'>(.*)<\/span>') 
pattern4 = re.compile('title=\'Naps posted: (.*) Winners:') 
pattern5 = re.compile('Winners: (.*)\'><img src=') 
 
 
for i in xrange(8): 
    user_delimiter = xmlload1['rows'][i]['cell']['username'] 
    selection_delimiter = xmlload1['rows'][i]['cell']['race_horse'] 
 
    username_delimiter_results = re.findall(pattern1, user_delimiter)[0] 
    userid_delimiter_results = int(re.findall(pattern2, user_delimiter)[0]) 
    user_selection = re.findall(pattern3, selection_delimiter)[0] 
    user_numberofselections = float(re.findall(pattern4, user_delimiter)[0]) 
    user_numberofwinners = float(re.findall(pattern5, user_delimiter)[0]) 
 
    strikeratecalc1 = user_numberofwinners/user_numberofselections 
    strikeratecalc2 = strikeratecalc1*100 
 
    print "user id = ",userid_delimiter_results 
    print "username = ",username_delimiter_results 
    print "user selection = ",user_selection 
    print "best price available as decimal = ",xmlload1['rows'][i]['cell']     ['tws.best_price'] 
    print "race time = ",xmlload1['rows'][i]['cell']['race_time'] 
    print "race meeting = ",xmlload1['rows'][i]['cell']['race_meeting'] 
    print "ROI = ",xmlload1['rows'][i]['cell']['roi'] 
    print "number of selections = ",user_numberofselections 
    print "number of winners = ",user_numberofwinners 
    print "Strike rate = ",strikeratecalc2,"%" 
    print "" 
 
 
getData() 
 
 
run_periodically(time()+5, time()+1000000, 15, getData) 

亲切的问候AEA

请您参考如下方法:

首先，我将讨论如何迭代结果。根据您的代码，xmlload1['rows'] 是一个字典数组，因此您可以直接遍历它，而不是选择任意数字。为了使这个示例更好，我将设置一些任意数据来说明这一点:

xmlload1 = { 
   "rows": [{"cell": {"username": "one", "race_horse":"b"}}, {"cell": {"username": "two", "race_horse": "c"}}] 
} 

因此，根据上面的数据，您可以在 for 循环中遍历行，如下所示:

for row in xmlload1['rows']: 
    cell = row["cell"] 
    print cell["username"] 
    print cell["race_horse"] 

每次迭代，单元格都采用可迭代对象中另一个元素的值(xmlload1['rows'] 中的列表)。这适用于支持迭代的任何容器或序列(如 lists、tuples、dicts、generators 等。 )

请注意，我没有在任何地方使用任何魔数(Magic Number)，所以 xmlload1['rows'] 可以是任意长的，它仍然有效。

您可以使用函数将请求设置为动态的，如下所示:

def get_data(rp=8, page=1): 
    parameters = {'page' : str(page), 
              'rp' : str(rp), 
              'sortname' : 'roi', 
              'sortorder' : 'desc' 
             } 
    data = urllib.urlencode(parameters) 
    trans_array = browser.open(post_url,data).read().decode('UTF-8') 
    return json.loads(trans_array) 

现在，您可以调用 get_data(rp=5) 获取 5 行，或调用 get_data(rp=8) 获取 8 行 [and get_data (rp=8, page=3) to get the third page], 等等。你可以清楚地添加额外的变量，甚至直接将 parameters dict 传递给函数。