问题
I've recently started to learn how to use python to parse xml files. I took the tutorial from http://pyxml.sourceforge.net/topics/howto/node12.html
When I run the following code I get the error:
Traceback (most recent call last):
File "C:\Users\Name\Desktop\pythonxml\tutorials\pythonxml\pyxml sourceforge\5.1 Comic Colection\SearchForComic.py", line 30, in -toplevel-
dh = FindIssue('sandman', '62')
TypeError: __init__() takes exactly 1 argument (3 given)
code:
from xml.sax import saxutils
class FindIssue(saxutils.DefaultHandler):
def __init___(self, title, number):
self.search_title, self.search_number = title, number
def startElement(self, name, attrs):
#if it's not a comic element, ignore it
if name!= 'comic': return
# look for the title and number sttributes (see text)
title = attrs.get('title', None)
number = attrs.get('number', None)
if (title == self.search_title and
number == self.search_number):
print title, '#' +str (number), 'found'
from xml.sax import make_parser
from xml.sax.handler import feature_namespaces
if __name__ == '__main__':
#Create a parser
parser = make_parser()
#tell the parser that we are not interested in XML namespaces
parser.setFeature(feature_namespaces, 0)
#create the handler
dh = FindIssue('sandman', '62')
#tell the parse to use our handler
parser.setContentHandler(dh)
#parse the input
parser.parse('collection.xml')
also on the last line I'm passing the file its in the current working directory is this the correct way to address the file?
回答1:
You've got too many _ in the name of __init__. The declaration of your constructor should be:
def __init__(self, title, number):
not:
def __init___(self, title, number):
回答2:
You have a typo - there's 3 underscores here:
def __init___(self, title, number):
Should be:
def __init__(self, title, number):
Because it doesn't exactly match the name __init__
, Python only knows about the default constructor, def __init__(self)
.
来源:https://stackoverflow.com/questions/11905148/typeerror-init-takes-exactly-1-argument-3-given-pyxml