python實現將html表格轉換成CSV文件的方法

發布于 2015-11-18 16:53:39 | 155 次閱讀 | 評論: 0 | 來源: 網友投遞

Python編程語言Python 是一種面向對象、解釋型計算機程序設計語言，由Guido van Rossum于1989年底發明，第一個公開發行版發行于1991年。Python語法簡潔而清晰，具有豐富和強大的類庫。它常被昵稱為膠水語言，它能夠把用其他語言制作的各種模塊(尤其是C/C++)很輕松地聯結在一起。

這篇文章主要介紹了python實現將html表格轉換成CSV文件的方法,涉及Python操作csv文件的相關技巧,需要的朋友可以參考下

本文實例講述了python實現將html表格轉換成CSV文件的方法。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 模塊

#!/usr/bin/python

# -*- coding: iso-8859-1 -*-

# Hello, this program is written in Python - http://python.org

programname = 'html2csv - version 2002-09-20 - http://sebsauvage.net'

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

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 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. '

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