On 6/26/12 5:30 PM, J wrote:
This is driving me batty... more enjoyment with the Python3
"Everything must be bytes" thing... sigh...
I have a file that contains a class used by other scripts. The class
is fed either a file, or a stream of output from another command, then
interprets that output and returns a set that the main program can
use... confusing, perhaps, but not necessarily important.
The class is created and then called with the load_filename method:
def load_filename(self, filename):
logging.info("Loading elements from filename: %s", filename)
file = open(filename, "rb", encoding="utf-8")
return self.load_file(file, filename)
I get this with Python 3.2:
Traceback (most recent call last):
File "bytes_unicode.py", line 32, in <module>
d.load_filename(__file__)
File "bytes_unicode.py", line 6, in load_filename
file = open(filename, "rb", encoding="utf-8")
ValueError: binary mode doesn't take an encoding argument
Are you sure you are copy-pasting the code that is actually running? Can you
reduce your test case down to a small self-contained example that runs and
demonstrates the problem? I suspect that there is some other detail that is
causing things to fail. The following code works fine for me:
#!/usr/bin/env python
# -*- coding: UTF-8 -*-
import re
class Dummy(object):
""" This is a dummy file.
éµ∫é∂∂é∂ üñîçø∂é
"""
def load_filename(self, filename):
file = open(filename, "r", encoding="utf-8")
return self.load_file(file, filename)
def load_file(self, file, filename="<stream>"):
for string in self._reader(file):
print(string)
if not string:
break
def _reader(self, file, size=4096, delimiter=r"\n{2,}"):
buffer_old = ""
while True:
buffer_new = file.read()
print(type(buffer_new))
if not buffer_new:
break
lines = re.split(delimiter, buffer_old + buffer_new)
buffer_old = lines.pop(-1)
for line in lines:
yield line
yield buffer_old
if __name__ == '__main__':
d = Dummy()
d.load_filename(__file__)
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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