urllibpython3
1. python3.4中urllib 有沒有urlencode函數
python3.x中urlencode在urllib.parse模塊中
使用方式urllib.parse.urlencode
urllib.parse.urlencode(query,
doseq=False, safe='', encoding=None,
errors=None, quote_via=quote_plus)
Convert a mapping object or a sequence of two-element tuples, which may
contain str
or bytes objects, to a 「percent-encoded」 string. If the
resultant string is to be used as a data for POST operation with urlopen() function, then it should be properly
encoded to bytes, otherwise it would result in a TypeError.
The resulting string is a series of key=value pairs separated by '&' characters, where
both key and value are quoted using the quote_via
function. By default, quote_plus() is used to quote the values, which
means spaces are quoted as a '+' character and 『/』 characters are encoded as %2F, which follows the
standard for GET requests (application/x-www-form-urlencoded). An alternate
function that can be passed as quote_via is quote(), which will encode spaces as %20 and not encode 『/』
characters. For maximum control of what is quoted, use quote and specify a value
for safe.
When a sequence of two-element tuples is used as the query argument,
the first element of each tuple is a key and the second is a value. The value
element in itself can be a sequence and in that case, if the optional parameter
doseq is evaluates to True, indivial key=value pairs separated
by '&' are
generated for each element of the value sequence for the key. The order of
parameters in the encoded string will match the order of parameter tuples in the
sequence.
The safe, encoding, and errors parameters are
passed down to quote_via (the encoding and errors
parameters are only passed when a query element is a str).
To reverse this encoding process, parse_qs() and parse_qsl() are provided in this mole to parse
query strings into Python data structures.
Refer to urllib examples to
find out how urlencode method can be used for generating query string for a URL
or data for POST.
Changed in version 3.2: Query parameter
supports bytes and string objects.
2. Python3提示錯誤 AttributeError: mole 'urllib.request' has no attribute 'HTTPHander' 怎麼解決
你在哪裡看到這樣的寫法的（教程鏈接等）
3. Python3 如何對url解碼實現Python2中urllib.unquote的作用
url編碼：
import urllib
url = 'http://test.com/s?wd=哈哈' #如果此網站編碼是gbk的話，需要進行解碼，從gbk解碼成unicode，再從Unicode編碼編碼為utf-8格式。
url = url.decode('gbk', 'replace')
print urllib.quote(url.encode('utf-8', 'replace'))
4. python3 import urllib.request錯誤求解
有區別。python能導入的有mole和package，mole是一個py文件，package是一堆py文件的一個特殊文件夾，urllib就屬於package。具體的度娘
5. python3怎麼安裝 urllib
不需要安裝，自帶的
直接import urllib就可以。
6. python3爬蟲urllib.request.urlopen("網址").read() 本來是utf-8，為什麼還要加上urlencode（「utf-8」）
你這行代碼是不需要urlencode()的。
對於返回的request對象，其read()方法獲得的其實是一個位元組流對象，而非字元串對象，所以這時需要調用該位元組流對象的decode()方法，按指定編碼方式進行解碼。
至於urlencode()，這是urllib中的一個函數，它的作用是將字元串進行url編碼。這個編碼其實就是個轉義的過程，將那些因可能造成解釋器誤會或安全問題而不適合出現在請求中的符號進行轉義，並且把超出url編碼表的字元降維。