我一直有一個有趣的時間建立一個小網站刮板,我覺得我做錯了什麼與我的變量或函數範圍。每當我嘗試將一些功能提取到單獨的函數中時,它會給我NameError:全局名稱'NAME'未定義。我發現很多人都遇到類似的問題,但是出現同樣的錯誤似乎有很多變化,我無法弄清楚。NameError:全局名稱「NAME」沒有定義
import urllib2, sys, urlparse, httplib, imageInfo
from BeautifulSoup import BeautifulSoup
from collections import deque
global visited_pages
visited_pages = []
global visit_queue
visit_queue = deque([])
global motorcycle_pages
motorcycle_pages = []
global motorcycle_pics
motorcycle_pics = []
global count
count = 0
def scrapePages(url):
#variables
max_count = 20
pic_num = 20
#decide how long it should go on...
global count
if count >= max_count:
return
#this is all of the links that have been scraped
the_links = []
soup = soupify_url(url)
#find all the links on the page
for tag in soup.findAll('a'):
the_links.append(tag.get('href'))
visited_pages.append(url)
count = count + 1
print 'number of pages visited'
print count
links_to_visit = the_links
# print 'links to visit'
# print links_to_visit
for link in links_to_visit:
if link not in visited_pages:
visit_queue.append(link)
print 'visit queue'
print visit_queue
while visit_queue:
link = visit_queue.pop()
print link
scrapePages(link)
print '***done***'
the_url = 'http://www.reddit.com/r/motorcycles'
#call the function
scrapePages(the_url)
def soupify_url(url):
try:
html = urllib2.urlopen(url).read()
except urllib2.URLError:
return
except ValueError:
return
except httplib.InvalidURL:
return
except httplib.BadStatusLine:
return
return BeautifulSoup.BeautifulSoup(html)
這裏是我的引用:
Traceback (most recent call last):
File "C:\Users\clifgray\Desktop\Mis Cosas\Programming\appengine\web_scraping\src\test.py", line 68, in <module>
scrapePages(the_url)
File "C:\Users\clifgray\Desktop\Mis Cosas\Programming\appengine\web_scraping\src\test.py", line 36, in scrapePages
soup = soupify_url(url)
NameError: global name 'soupify_url' is not defined
_Where_你得到的錯誤?在哪條線上? –
剛添加引用。這是正確的,當我嘗試打電話給在scrapePages功能 – clifgray
BTW的soupify_url功能,使用'global'關鍵字的最高模塊範圍也什麼都沒有。 – geoffspear