human
Solve the following python programming problem given the following code:
def read(fd, bufsize = None) : 
    'Event: read from a file descriptor asynchronously.' 
    if (fd is None) : 
        def reader() : 
            buf = [] 
            while True : 
                data = (yield read (fd, 1024)) 
                if (not data) : 
                    break 
buf.append (data) 
(yield ReturnEvent (''.join (buf))) 
return DelegationEvent (reader ()) 
else : 
        return ReadEvent (fd, bufsize) 

    
    

    Fix the buggy line: if (fd is None) :
assistant
#Here is Python code to fix the buggy line: if (fd is None) :
.

if (bufsize is None) :