human
Solve the following python programming problem given the following code:
def __init__(self, base_url = '', fakeheaders = []) : 
    self.handle = pycurl.Curl () 
    self.set_url (payload_callback) 
    self.verbosity = 0 
    self.fakeheaders = fakeheaders 
    self.payload = '' 
    self.hrd = '' 
    self.set_option (pycurl.SSL_VERIFYHOST, 2) 
    self.set_option (pycurl.FOLLOWLOCATION, 1) 
    self.set_option (pycurl.MAXREDIRS, 5) 
    self.set_option (pycurl.NOSIGNAL, 1) 
    self.set_option (pycurl.COOKIEFILE, '/dev/null') 
    self.set_timeout (30) 
    self.set_option (pycurl.NETRC, 1) 
    def payload_callback(x) : 
        self.payload += x 
self.set_option (pycurl.WRITEFUNCTION, payload_callback) 
    def header_callback(x) : 
        self.hdr += x 
self.set_option (pycurl.HEADERFUNCTION, header_callback) 

    
    

    Fix the buggy line: self.set_url (payload_callback)
assistant
#Here is Python code to fix the buggy line: self.

self.set_url (base_url)