Python Crawler - AttributeError：Crawler 实例没有属性“url”；
我正在尝试学习 python 中的课程：
#!/usr/bin/env python
# *-* coding: utf-8 *-*
import urllib2
from BeautifulSoup import BeautifulSoup as bs
class Crawler:
def visit(self, url):
self.request = urllib2.Request(self.url)
self.response = urllib2.urlopen(self.request)
return self.response.read()
if __name__ == "__main__":
x = Crawler()
print x.visit("http://google.com/")
当我尝试开始收到错误时：
sigo@sarch ~/sources $ python test.py
Traceback (most recent call last):
File "test.py", line 16, in <module>
print x.visit("http://google.com/")
File "test.py", line 10, in visit
self.request = urllib2.Request(self.url)
AttributeError: Crawler instance has no attribute 'url'
我做错了什么？
I'm trying to learn the classes in python:
#!/usr/bin/env python
# *-* coding: utf-8 *-*
import urllib2
from BeautifulSoup import BeautifulSoup as bs
class Crawler:
def visit(self, url):
self.request = urllib2.Request(self.url)
self.response = urllib2.urlopen(self.request)
return self.response.read()
if __name__ == "__main__":
x = Crawler()
print x.visit("http://google.com/")
When I try to start getting the error:
sigo@sarch ~/sources $ python test.py
Traceback (most recent call last):
File "test.py", line 16, in <module>
print x.visit("http://google.com/")
File "test.py", line 10, in visit
self.request = urllib2.Request(self.url)
AttributeError: Crawler instance has no attribute 'url'
What am I doing wrong?
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您所说的
self.url指的是 Crawler 类的url属性，该属性不存在。您只需使用url，因为这是visit()函数参数中的变量名称。You're saying
self.urlwhich is referring to the Crawler class'surlattribute, which does not exist. You need to use justurlsince that's the name of the variable from yourvisit()function arguments.