python實現將html表格轉換成CSV檔案的方法

本文執行個體講述了python實現將html表格轉換成CSV檔案的方法。分享給大家供大家參考。具體如下：

使用方法：python html2csv.py *.html
這段代碼使用了 HTMLParser 模組

#!/usr/bin/python# -*- coding: iso-8859-1 -*-# Hello, this program is written in Python - http://python.orgprogramname = 'html2csv - version 2002-09-20 - http://sebsauvage.net'import sys, getopt, os.path, glob, HTMLParser, retry:  import psyco ; psyco.jit() # If present, use psyco to accelerate the programexcept: passdef usage(progname):  ''' Display program usage. '''  progname = os.path.split(progname)[1]  if os.path.splitext(progname)[1] in ['.py','.pyc']: progname = 'python '+progname  return '''%sA coarse HTML tables to CSV (Comma-Separated Values) converter.Syntax  : %s source.htmlArguments : source.html is the HTML file you want to convert to CSV.      By default, the file will be converted to csv with the same      name and the csv extension (source.html -> source.csv)      You can use * and ?.Examples  : %s mypage.html      : %s *.htmlThis program is public domain.Author : Sebastien SAUVAGE      http://sebsauvage.net''' % (programname, progname, progname, progname)class html2csv(HTMLParser.HTMLParser):  ''' A basic parser which converts HTML tables into CSV.    Feed HTML with feed(). Get CSV with getCSV(). (See example below.)    All tables in HTML will be converted to CSV (in the order they occur    in the HTML file).    You can process very large HTML files by feeding this class with chunks    of html while getting chunks of CSV by calling getCSV().    Should handle badly formated html (missing , , ,    extraneous , ...).    This parser uses HTMLParser from the HTMLParser module,    not HTMLParser from the htmllib module.    Example: parser = html2csv()         parser.feed( open('mypage.html','rb').read() )         open('mytables.csv','w+b').write( parser.getCSV() )    This class is public domain.    Author: Sébastien SAUVAGE         http://sebsauvage.net    Versions:      2002-09-19 : - First version      2002-09-20 : - now uses HTMLParser.HTMLParser instead of htmllib.HTMLParser.            - now parses command-line.    To do:      - handle 
 tags      - convert html entities (&name; and &#ref;) to Ascii.      '''  def __init__(self):    HTMLParser.HTMLParser.__init__(self)    self.CSV = ''   # The CSV data    self.CSVrow = ''  # The current CSV row beeing constructed from HTML    self.inTD = 0   # Used to track if we are inside or outside a ... tag.    self.inTR = 0   # Used to track if we are inside or outside a ... tag.    self.re_multiplespaces = re.compile('\s+') # regular expression used to remove spaces in excess    self.rowCount = 0 # CSV output line counter.  def handle_starttag(self, tag, attrs):    if  tag == 'tr': self.start_tr()    elif tag == 'td': self.start_td()  def handle_endtag(self, tag):    if  tag == 'tr': self.end_tr()    elif tag == 'td': self.end_td()       def start_tr(self):    if self.inTR: self.end_tr() #  implies     self.inTR = 1  def end_tr(self):    if self.inTD: self.end_td() #  implies     self.inTR = 0          if len(self.CSVrow) > 0:      self.CSV += self.CSVrow[:-1]      self.CSVrow = ''    self.CSV += '\n'    self.rowCount += 1  def start_td(self):    if not self.inTR: self.start_tr() #  implies     self.CSVrow += '"'    self.inTD = 1  def end_td(self):    if self.inTD:      self.CSVrow += '",'       self.inTD = 0  def handle_data(self, data):    if self.inTD:      self.CSVrow += self.re_multiplespaces.sub(' ',data.replace('\t',' ').replace('\n','').replace('\r','').replace('"','""'))  def getCSV(self,purge=False):    ''' Get output CSV.      If purge is true, getCSV() will return all remaining data,      even if  or  are not properly closed.      (You would typically call getCSV with purge=True when you do not have      any more HTML to feed and you suspect dirty HTML (unclosed tags). '''    if purge and self.inTR: self.end_tr() # This will also end_td and append last CSV row to output CSV.    dataout = self.CSV[:]    self.CSV = ''    return dataoutif __name__ == "__main__":  try: # Put getopt in place for future usage.    opts, args = getopt.getopt(sys.argv[1:],None)  except getopt.GetoptError:    print usage(sys.argv[0]) # print help information and exit:    sys.exit(2)  if len(args) == 0:    print usage(sys.argv[0]) # print help information and exit:    sys.exit(2)      print programname  html_files = glob.glob(args[0])  for htmlfilename in html_files:    outputfilename = os.path.splitext(htmlfilename)[0]+'.csv'    parser = html2csv()    print 'Reading %s, writing %s...' % (htmlfilename, outputfilename)    try:      htmlfile = open(htmlfilename, 'rb')      csvfile = open( outputfilename, 'w+b')      data = htmlfile.read(8192)      while data:        parser.feed( data )        csvfile.write( parser.getCSV() )        sys.stdout.write('%d CSV rows written.\r' % parser.rowCount)        data = htmlfile.read(8192)      csvfile.write( parser.getCSV(True) )      csvfile.close()      htmlfile.close()    except:      print 'Error converting %s    ' % htmlfilename      try:  htmlfile.close()      except: pass      try:  csvfile.close()      except: pass  print 'All done. '
希望本文所述對大家的Python程式設計有所協助。
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