TypeError str does not support the buffer interface

Question

plaintext   input  Please enter the text you want to compress   filename   input  Please enter the desired filename   with gzip open filename     gz    wb   as outfile      outfile write plaintext     The above python code is giving me following error   Traceback  most recent call last     File  C  Users Ankur Gupta Desktop Python works gzip work1 py   line 33  in  lt module gt      compress string     File  C  Users Ankur Gupta Desktop Python works gzip work1 py   line 15  in compress string     outfile write plaintext    File  C  Python32 lib gzip py   line 312  in write     self crc   zlib crc32 data  self crc   amp  0xffffffff TypeError   str  does not support the buffer interface

User · Answer

There is an easier solution to this problem.

You just need to add a t to the mode so it becomes wt. This causes Python to open the file as a text file and not binary. Then everything will just work.

The complete program becomes this:

plaintext = input("Please enter the text you want to compress")
filename = input("Please enter the desired filename")
with gzip.open(filename + ".gz", "wt") as outfile:
    outfile.write(plaintext)

User · Answer

You can not serialize a Python 3  string  to bytes without explict conversion to some encoding   outfile write plaintext encode  utf-8      is possibly what you want  Also this works for both python 2 x and 3 x

User · Answer

For Python 3 x you can convert your text to raw bytes through   bytes  my data    encoding     For example   bytes  attack at dawn    utf-8     The object returned will work with outfile write

User · Answer

For Django in django test TestCase unit testing  I changed my Python2 syntax   def test view self       response   self client get reverse  myview        self assertIn str self obj id   response content            To use the Python3  decode  utf8   syntax   def test view self       response   self client get reverse  myview        self assertIn str self obj id   response content decode  utf8

User · Answer

This problem commonly occurs when switching from py2 to py3  In py2 plaintext is both a string and a byte array type  In py3 plaintext is only a string  and the method outfile write   actually takes a byte array when outfile is opened in binary mode  so an exception is raised  Change the input to plaintext encode  utf-8   to fix the problem  Read on if this bothers you      In py2  the declaration for file write made it seem like you passed in a string  file write str   Actually you were passing in a byte array  you should have been reading the declaration like this  file write bytes   If you read it like this the problem is simple  file write bytes  needs a bytes type and in py3 to get bytes out of a str you convert it   py3 gt  gt  outfile write plaintext encode  utf-8      Why did the py2 docs declare file write took a string  Well in py2 the declaration distinction didn t matter because    py2 gt  gt  str  bytes          str and bytes aliased a single hybrid class in py2 True   The str-bytes class of py2 has methods constructors that make it behave like a string class in some ways and a byte array class in others  Convenient for file write isn t it    py2 gt  gt  plaintext  my string literal  py2 gt  gt  type plaintext  str                               is it a string or is it a byte array  it s both   py2 gt  gt  outfile write plaintext     can use plaintext as a byte array   Why did py3 break this nice system  Well because in py2 basic string functions didn t work for the rest of the world  Measure the length of a word with a non-ASCII character   py2 gt  gt  len    no           length of string 3  length of UTF-8 byte array 4  since with variable len encoding the non-ASCII chars   2-6 bytes 4                        always gives bytes len not str len   All this time you thought you were asking for the len of a string in py2  you were getting the length of the byte array from the encoding  That ambiguity is the fundamental problem with double-duty classes  Which version of any method call do you implement   The good news then is that py3 fixes this problem  It disentangles the str and bytes classes  The str class has string-like methods  the separate bytes class has byte array methods   py3 gt  gt  len    ok          string 3 py3 gt  gt  len    ok  encode  utf-8         bytes 4   Hopefully knowing this helps de-mystify the issue  and makes the migration pain a little easier to bear

User · Answer

If you use Python3x then string is not the same type as for Python 2 x  you must cast it to bytes  encode it    plaintext   input  Please enter the text you want to compress   filename   input  Please enter the desired filename   with gzip open filename     gz    wb   as outfile      outfile write bytes plaintext   UTF-8      Also do not use variable names like string or file while those are names of module or function   EDIT  Tom  Yes  non-ASCII text is also compressed decompressed  I use Polish letters with UTF-8 encoding   plaintext    Polish text  aceln  szzACELN  SZZ  filename    foo gz  with gzip open filename   wb   as outfile      outfile write bytes plaintext   UTF-8    with gzip open filename   r   as infile      outfile content   infile read   decode  UTF-8   print outfile content

User · Answer

gt  gt  gt  s   bytes  s   utf-8    gt  gt  gt  print s  b s   gt  gt  gt  s   s decode  utf-8    gt  gt  gt  print s  s   Well if useful for you in case removing annoying  b  character If anyone got better idea please suggest me or feel free to edit me anytime in here I m just newbie

[python] TypeError: 'str' does not support the buffer interface

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