python将html表格转换成CSV详解编程语言

python将html表格转换成CSV

使用方法：python html2csv.py *.html

这段代码使用了 HTMLParser 模块

#!/usr/bin/python 
# -*- coding: iso-8859-1 -*- 
# Hello, this program is written in Python - http://python.org 
programname = 'html2csv - ' 
  
import sys, getopt, os.path, glob, HTMLParser, re 
  
try:    import psyco ; psyco.jit()  # If present, use psyco to accelerate the program 
except: pass 
  
def usage(progname): 
    ''' Display program usage. ''' 
    progname = os.path.split(progname)[1] 
    if os.path.splitext(progname)[1] in ['.py','.pyc']: progname = 'python '+progname 
    return '''%s 
A coarse HTML tables to CSV (Comma-Separated Values) converter. 
  
Syntax    : %s source.html 
  
Arguments : 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 *.html 
  
This program is public domain. 
Author : Sebastien SAUVAGE <sebsauvage at sebsauvage dot net> 
         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 <tr>, </tr>, </td>, 
        extraneous </td>, </tr>...). 
        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 <sebsauvage at sebsauvage dot net> 
                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 <PRE> 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 <TD>...</TD> tag. 
        self.inTR = 0      # Used to track if we are inside or outside a <TR>...</TR> 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()  # <TR> implies </TR> 
        self.inTR = 1 
    def end_tr(self): 
        if self.inTD: self.end_td()  # </TR> implies </TD> 
        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() # <TD> implies <TR> 
        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 <td> or <tr> 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 dataout 
  
  
if __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.