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  • 如何实时监控库存变动

     1 import urllib
     2 import os
     3 from bs4 import BeautifulSoup
     4 import difflib
     5 import time
     6 
     7 while(1):
     8     if os.path.exists('d:/new.txt') and os.path.exists('d:/old.txt'):
     9        os.remove('d:/old.txt')
    10     if os.path.exists('d:/new.txt'):
    11        os.rename('d:/new.txt','d:/old.txt')
    12     url = 'http://www.zhenxin520.com/trends.asp?id=95'
    13     response = urllib.urlopen(url)
    14     soup =BeautifulSoup(response)
    15     text = soup.find_all("td", attrs={"class": "text3"})
    16     f1=open('d:/new.txt','w+')
    17     f1.write(str(text))
    18     f1.close()
    19     if not os.path.exists('d:/old.txt'):
    20        continue
    21     f1=open('d:/new.txt','r')
    22     f2=open('d:/old.txt','r')
    23     f3=open('d:/diff.txt','w+')
    24     d=difflib.Differ()
    25     f1_lines=f1.readlines()
    26     f2_lines=f2.readlines()
    27     diff=list(d.compare(f1_lines,f2_lines))
    28     diff2=list(d.compare(f2_lines,f1_lines))
    29     i = -1
    30     for line in diff:
    31       i+=1
    32       line2 = diff2[i]
    33       if line[0]=='-':
    34          try:
    35             start = line.index('D')
    36             start2 = line2.index('D')
    37             substr = line[start:]
    38             substr2 = line2[start2:]
    39             rmstr = ['<span>','</span>','<br/>','</p>']
    40             for j in rmstr:
    41               substr = substr.replace(j,'')
    42               substr2 = substr2.replace(j,'')
    43             f3.write('new---'+substr+'
    old---'+substr2+'
    ')
    44          except:
    45             continue
    46     f3.close()
    47     f2.close()
    48     f1.close()
    49     time.sleep(600)

    differ.txt输出结果:

    new---D012红色:男L*7 XL*3 XXL*22 女M*2 童4*7 

    old---D012红色:男L*7 XL*4 XXL*22 女 S M L 童4*9 

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  • 原文地址:https://www.cnblogs.com/turingbrain/p/5068817.html
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