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python将html表格转换成CSV

2018-05-17 08:00 星期四 所属: Python教程 浏览:418

python将html表格转换成CSV
使用方法:pythonhtml2csv.py*.html
这段代码使用了HTMLParser模块“`python

!/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: S&eacute;bastien 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 (&amp;name; and &amp;#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.
“`

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