TypeError：強制爲Unicode：需要字符串或緩衝區，找到用戶

Question

我必須爲用戶（大學練習）抓取last.fm。我是python的新手，並得到以下錯誤：

Traceback (most recent call last): 
    File "crawler.py", line 23, in <module> 
    for f in user_.get_friends(limit='200'): 
    File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/pylast.py", line 2717, in get_friends 
    for node in _collect_nodes(limit, self, "user.getFriends", False): 
    File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/pylast.py", line 3409, in _collect_nodes 
    doc = sender._request(method_name, cacheable, params) 
    File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/pylast.py", line 969, in _request 
    return _Request(self.network, method_name, params).execute(cacheable) 
    File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/pylast.py", line 721, in __init__ 
    self.sign_it() 
    File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/pylast.py", line 727, in sign_it 
    self.params['api_sig'] = self._get_signature() 
    File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/pylast.py", line 740, in _get_signature 
    string += self.params[name] 
TypeError: coercing to Unicode: need string or buffer, User found 

我使用pylast lib進行爬網。我想要做什麼：

我想得到一個用戶朋友和用戶朋友的朋友。發生錯誤時，當我有另一個for循環for循環。這裏的代碼：

network = pylast.get_lastfm_network(api_key = API_KEY, api_secret = API_SECRET, username = username, password_hash = password_hash) 
user = network.get_user("vidarnelson") 

friends = user.get_friends(limit='200') 

i = 1 

for friend in friends: 
user_ = network.get_user(friend) 
print '#%d %s' % (i, friend) 
i = i + 1 

for f in user_.get_friends(limit='200'): 
    print f 

有什麼建議嗎？

在此先感謝。問候！

Answer 1

它看起來像get_friends將返回一個User對象的列表，因此您不需要在其條目上調用get_user。只需使用：

for friend in friends: 
    for f in friend.get_friends(limit='200'): 
     ...