How to use the pycurl.USERAGENT function in pycurl

def _curl_handle():

        curl_head = Curl()
        curl_head.setopt(pycurl.SSL_VERIFYPEER, 0)
        curl_head.setopt(pycurl.SSL_VERIFYHOST, 0)
        curl_head.setopt(pycurl.NOBODY, 1)
        curl_head.setopt(pycurl.TIMEOUT, HttpDirectory.TIMEOUT)
        curl_head.setopt(pycurl.USERAGENT, config.HEADERS["User-Agent"])

        return curl_head

def uploadFile(fname):
        dest_url = b'aHR0cHM6Ly9pbWcudmltLWNuLmNvbS8='  # heihei
        dest_url = base64.b64decode(dest_url).decode()

        c = pycurl.Curl()
        c.setopt(pycurl.URL, dest_url)
        c.setopt(pycurl.POST, 1)

        filename = fname
        c.setopt(c.HTTPPOST, [(('file', (c.FORM_FILE, filename)))])
        c.setopt(pycurl.SSL_VERIFYPEER, 0)
        c.setopt(pycurl.SSL_VERIFYHOST, 0)
        c.setopt(pycurl.USERAGENT, 'curl/7.45.0')
        # c.setopt(pycurl.VERBOSE, 1)
        # c.setopt(pycurl.PROXY, '127.0.0.1:8117')
        # c.setopt(pycurl.PROXYTYPE_HTTP, 1)

        outval = io.BytesIO()
        hdrval = io.BytesIO()
        c.setopt(pycurl.WRITEFUNCTION, outval.write)
        c.setopt(pycurl.HEADERFUNCTION, hdrval.write)
        c.setopt(pycurl.TIMEOUT, 107)  # 这网烂成如此，不容易

        c.perform()
        c.close()

        # print(outval.getvalue().decode(), hdrval.getvalue().decode())
        url = outval.getvalue().decode()
        if not url.startswith('https://'): print('upload error: ', hdrval.getvalue())

if not downtotal:
                                if size and downcurrent:
                                    item.progress(partsize+downcurrent, size)
                            else:
                                item.progress(partsize+downcurrent,
                                              partsize+downtotal)

                        handle.setopt(pycurl.URL, str(url))
                        handle.setopt(pycurl.OPT_FILETIME, 1)
                        handle.setopt(pycurl.NOPROGRESS, 0)
                        handle.setopt(pycurl.PROGRESSFUNCTION, progress)
                        handle.setopt(pycurl.WRITEDATA, local)
                        handle.setopt(pycurl.FOLLOWLOCATION, 1)
                        handle.setopt(pycurl.MAXREDIRS, 5)
                        handle.setopt(pycurl.HTTPHEADER, ["Pragma:"])
                        handle.setopt(pycurl.USERAGENT, "smart/" + VERSION)

                        # check if we have a valid local file and use I-M-S
                        if fetcher.validate(item, localpath):
                            handle.setopt(pycurl.TIMECONDITION,
                                          pycurl.TIMECONDITION_IFMODSINCE)
                            mtime = os.path.getmtime(localpath)
                            if url.scheme == "ftp":
                                mtime += 1 # libcurl handles ftp mtime wrongly
                            handle.setopt(pycurl.TIMEVALUE, int(mtime))
                        else:
                            # reset the I-M-S option 
                            handle.setopt(pycurl.TIMECONDITION,
                                          pycurl.TIMECONDITION_NONE)

                        self._lock.acquire()
                        multi.add_handle(handle)

def init_pycurl(debug=False):
    """
    Provides an instances of pycurl with basic configuration
    :return: pycurl instance
    """
    _curl = pycurl.Curl()
    _curl.setopt(pycurl.SSL_OPTIONS, pycurl.SSLVERSION_TLSv1_2)
    _curl.setopt(pycurl.SSL_VERIFYPEER, False)
    _curl.setopt(pycurl.SSL_VERIFYHOST, False)
    _curl.setopt(pycurl.VERBOSE, debug)
    _curl.setopt(pycurl.TIMEOUT, 10)
    _curl.setopt(pycurl.COOKIEFILE, "")
    _curl.setopt(pycurl.USERAGENT, 'APIFuzzer')
    return _curl

def dxDown(url, fullpath):
	c=pycurl.Curl() # 縮寫一下
	c.setopt(c.FOLLOWLOCATION, True) # 允許重定向
	c.setopt(pycurl.USERAGENT, b"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)") # 模擬瀏覽器
	c.setopt(pycurl.URL, url) # 訪問指定網址
	c.setopt(pycurl.COOKIEJAR, 'cookie.txt') # 把 cookie 存到文件
	c.setopt(pycurl.COOKIEFILE, "cookie.txt") # 用文件掛 cookie
	f = open(fullpath, 'wb') # 定義一個文件
	c.setopt(c.WRITEDATA, f) # 指定返回信息的寫入文件，或作 c.setopt(c.WRITEFUNCTION, f.write)
	c.perform() # 獲得服務器返回信息
	f.close()
	if c.getinfo(pycurl.HTTP_CODE) != 200:
		os.remove(fullpath)
		print("Failed!")

def poke():
    #enter infinite poke loop
    while True:
        buf = cStringIO.StringIO()
        c = pycurl.Curl()
        c.setopt(pycurl.URL, "https://www.facebook.com/pokes?notif_t=poke")
        c.setopt(pycurl.COOKIEFILE, "pycookie.txt")
        c.setopt(pycurl.COOKIEJAR, "pycookie.txt")
        c.setopt(pycurl.WRITEFUNCTION, buf.write)
        c.setopt(pycurl.FOLLOWLOCATION, 1)
        c.setopt(pycurl.ENCODING, "")
        c.setopt(pycurl.USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)")
        c.perform()
        curlData = buf.getvalue()
        buf.close()
        #print curlData
        pokebackdata = re.findall(ur"<div class="\&quot;pokeHeader"><a data-hovercard="\&quot;\/ajax\/hovercard\/user.php\?id=([0-9]*)\&quot;" href="\&quot;(.*?)\&quot;">([^&lt;]*)&lt;\/a&gt; has poked you.&lt;\/div&gt;",curlData)
        pokesuggestdata = re.findall(ur"</a><div class="\&quot;userSuggestionName\&quot;"><a data-hovercard="\&quot;\/ajax\/hovercard\/user.php\?id=([0-9]*)\&quot;" href="\&quot;(.*?)\&quot;"><span class="\&quot;fwb\&quot;"></span></a><a data-hovercard="\&quot;\/ajax\/hovercard\/user.php\?id=([0-9]*)\&quot;" href="\&quot;https:\/\/www.facebook.com\/(.*?)\&quot;">([^&lt;]*)&lt;\/a&gt;&lt;\/span&gt;&lt;\/div&gt;",curlData)
        #print pokebackdata
        userid = re.findall(ur"\"user\":\"([0-9]*)\"",curlData)
        fb_dtsg = re.findall(ur"name=\"fb_dtsg\" value=\"([^\"]*)",curlData)

        if len(pokesuggestdata)&gt;0 and newpoke:
            for victim in pokesuggestdata:
                victimid = victim[1]
                postdata = '__a=1&amp;nctr[_mod]=pagelet_pysp&amp;suggestion=1&amp;__user='+str(userid[0])+'&amp;fb_dtsg='+fb_dtsg[0]+'&amp;uid='+str(victimid)
                buf = cStringIO.StringIO()
                c = pycurl.Curl()</a></div></div>

"""
        http_error = None
        http_code = 0
        if output_file_name:
            http_output = open(output_file_name, "w")
        else:
            http_output = StringIO.StringIO()
        post_data = [] 
        file_t = (file_t[0], (pycurl.FORM_FILE, file_t[1]))
        post_data.append(file_t)
        if data:
            post_data += data.items()

        # prepare 
        c = pycurl.Curl()
        c.setopt(pycurl.USERAGENT, self.http_useragent)
        c.setopt(pycurl.URL, url)
        c.setopt(pycurl.WRITEFUNCTION, http_output.write)
        c.setopt(c.POST, 1)
        c.setopt(c.HTTPPOST, post_data) 
        if digest_user and digest_pass:
            c.setopt(pycurl.HTTPAUTH, pycurl.HTTPAUTH_DIGEST)
            c.setopt(pycurl.USERPWD, "%s:%s" % (digest_user, digest_pass))
        if self.debug:
            c.setopt(c.VERBOSE, 1)
        # perform
        try:
            c.perform()
        except pycurl.error, e:
            http_error = e
        http_code = c.getinfo(pycurl.HTTP_CODE)
        http_output.seek(0)

def set_agent(self, agent):
        """
        Set the user agent.
        """
        self.agent = agent
        self.set_option(pycurl.USERAGENT, self.agent)
        return agent