AttributeError：'NoneType'對象沒有屬性'split'

Question

我有一個包含這兩個函數的腳本：

# Getting content of each page
def GetContent(url):
    response = requests.get(url)
    return response.content

# Extracting the sites
def CiteParser(content):
    soup = BeautifulSoup(content)
    print "---> site #: ",len(soup('cite'))
    result = []
    for cite in soup.find_all('cite'):
        result.append(cite.string.split('/')[0])
    return result

當我運行程序時，我有以下錯誤：

result.append(cite.string.split('/')[0])
AttributeError: 'NoneType' object has no attribute 'split'

輸出樣本：

URL: <URL That I use to search 'can be google, bing, etc'>
---> site #:  10
site1.com
.
.
.
site10.com

URL: <URL That I use to search 'can be google, bing, etc'>
File "python.py", line 49, in CiteParser
    result.append(cite.string.split('/')[0])
AttributeError: 'NoneType' object has no attribute 'split'

Answer 1

可能會發生，字符串里面沒有任何東西，而不是“無”類型，所以我可以假設首先檢查你的字符串是不是“無”

# Extracting the sites
def CiteParser(content):
    soup = BeautifulSoup(content)
    #print soup
    print "---> site #: ",len(soup('cite'))
    result = []
    for cite in soup.find_all('cite'):
        if cite.string is not None:
            result.append(cite.string.split('/'))
            print cite
    return result

Answer 2

for cite in soup.find_all('cite'):
    if( (cite.string is None) or (len(cite.string) == 0)):
        continue
    result.append(cite.string.split('/')[0])