Error when using zlib.compress function in Python 3.2

Question

I'm importing zlib in my Python program. It works fine in Python 2.6 but shows an error when I try to run it in Python 3.2.

This is my code:

import zlib
s = 'sam'
print ("Your string length is",len(s))
t = zlib.compress(s)
print ("Your compressed string is",t)
print ("Your compressed string length is",len(t))
print ("Your decompressed string is",zlib.decompress(t))
print ("Crc32 is",zlib.crc32(t))

The error I get is this:

Your string length is 3
Traceback (most recent call last):
  File "F:\workspace\samples\python\zip.py", line 4, in <module>
    t = zlib.compress(s)
TypeError: 'str' does not support the buffer interface

But the above program works fine in Python 2.6. Should I use an alternative to zlib? Please help me.

Edit: I got it to work. It seems I needed to encode it. Here is the revised code:

import zlib
s = 'sam'
print ("Your string length is",len(s))
s=s.encode('utf-8')
t = zlib.compress(s)
print ("Your compressed string is",t)
print ("Your compressed string length is",len(t))
print ("Your decompressed string is",zlib.decompress(t))
print ("Crc32 is",zlib.crc32(t))

The search on Stackoverflow does work: stackoverflow.com/… — Lennart Regebro
– Lennart Regebro, Commented Jan 30, 2012 at 11:14
exact duplicate of TypeError: 'str' does not support the buffer interface And two million other questions with the exact same error message and answer. — Lennart Regebro
– Lennart Regebro, Commented Jan 30, 2012 at 11:16

Lennart Regebro · Accepted Answer · 2012-01-30 11:19:12Z

4

Th str type in Python is no longer a sequence of 8-bit characters, but a sequence of Uncode characters. You need to use the bytes type for binary data. You convert between strings and bytes by encoding/decoding.

answered Jan 30, 2012 at 11:19

Lennart Regebro

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