Python HTMLParser 打印出空行

Question

I'm playing around with python's HTMLParser and having an issue with it printing out blank lines.

from HTMLParser import HTMLParser
import urllib2
class MyHTMLParser(HTMLParser):
def handle_data(self, data):
     print "Encountered some data  :", data

# instantiate the parser and fed it some HTML
url = 'http://www.ngccoin.com/price-guide/us/flying-eagle-cents-pscid-16-desig-ms'
req = urllib2.Request(url, headers={'User-Agent' :"Magic Browser"})
response = urllib2.urlopen(req)
html = response.read()

parser = MyHTMLParser()
parser.feed( html )

My issue is when it hits a data section it prints out just new lines as well as actual data. MY output looks a lot like:

Encountered some data  :

Encountered some data  : Official Grading Service of
Encountered some data  :

Encountered some data  :

Encountered some data  :

How should I go about getting it to ignore those lines with just a new line?

Answer 1

Simply have it ignore those lines with just a new line:

def handle_data(self, data):
    if data == '\n':
        return
    print "Encountered some data  :", data

Or, have it ignore any data consisting of only whitespace:

def handle_data(self, data):
    if not data.strip():
        return
    print "Encountered some data  :", data

Answer 2

Because data passes one line at a time, Data needs to be aggregated as such:

def handle_data(self, data):
  self.cell += data

Then later in the close tag....

def handle_endtag(self, tag):
  self.somevariable = self.cell.strip()
  self.cell = ''

Stripping the newlines at the end preserves the formatting of the data.