Python 3: server error: TypeError: 'str' does not support the buffer interface

Question

I got stuck on an error which I didn't have when I've done something similar in python 2.

Here is the code:

def computeSha(self,reqFile):
    filesize_bytes = os.path.getsize(reqFile)

    s = sha1()
    s.update(("blob %u\0" % filesize_bytes).encode('utf-8'))

    with open(reqFile, 'rb') as f:
        s.update(f.read())

    s = s.hexdigest()
    print ("here is the sha: " + s)
    return s

def _sendSha(self, component_id):
    component_path = db_connector.get_design_path(component_id)
    sha = self.computeSha(component_path)

    self.connection.send(self._adjustLength(len(sha)))
    self.connection.sendall(data)

The error appears here: self.connection.send(self._adjustLength(len(sha)))

Here is the code for adjustLength:

def _adjustLength(self, length):
    #max size is 8 bytes long
    length = str(length)
    if DEBUG:
        print("_adjustLength before:" + length)
    while len(length) < 8:
        length = "0"+length
    length = length+"\n"
    if DEBUG:
        print("_adjustLength after:" + length)
    return length

Please include the error you're asking about in the question. By that I mean the full traceback. — Cyphase
– Cyphase, Commented Aug 13, 2015 at 12:57
I think we're going to need the code for self._adjustLength(). — Cyphase
– Cyphase, Commented Aug 13, 2015 at 12:58
But generally, this looks like a bytes versus unicode issue. — Cyphase
– Cyphase, Commented Aug 13, 2015 at 12:58
Try replacing self.connection.send(self._adjustLength(len(sha))) with self.connection.send(self._adjustLength(len(sha)).encode()). — Cyphase
– Cyphase, Commented Aug 13, 2015 at 13:04

Cyphase · Accepted Answer · 2015-08-13 13:08:19Z

2

Replace this:

self.connection.send(self._adjustLength(len(sha)))

with this:

self.connection.send(self._adjustLength(len(sha)).encode())

In Python 3, unicode strings are now the default. Sockets expect byte strings, so you have to convert the unicode strings to byte strings. You do that with .encode().

I am glossing over a bit (a lot) that's not directly relevant to the question. Ned Batchelder's Unipain talk is a good resource though.

answered Aug 13, 2015 at 13:08

Cyphase

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