I added UnicodeReader and UnicodeWriter example classes to the csv module
docs just now. They mention problems with ASCII NUL characters (which I
vaguely remember - NUL-terminated strings are used internally, right?). Do
NULs still present a problem? I saw nothing in the log messages that
mentioned "ascii" or "nul" so I presume it is.
Here's what I added. Let me know if you think it needs any corrections,
especially if there's a better way to word "as long as you avoid encodings
like utf-16 that use NULs". Can that just be "as long as you avoid
multi-byte encodings other than utf-8"? I'd like to have something like
this in the docs to demonstrate a reasonable workaround for the current
no-Unicode code without casting it in stone by adding it to csv.py.
--------------------------------------------------------------------------
The \module{csv} module doesn't directly support reading and writing
Unicode, but it is 8-bit clean save for some problems with \ASCII{} NUL
characters, so you can write classes that handle the encoding and decoding
for you as long as you avoid encodings like utf-16 that use NULs.
\begin{verbatim}
import csv
class UnicodeReader:
def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
self.reader = csv.reader(f, dialect=dialect, **kwds)
self.encoding = encoding
def next(self):
row = self.reader.next()
return [unicode(s, self.encoding) for s in row]
def __iter__(self):
return self
class UnicodeWriter:
def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
self.writer = csv.writer(f, dialect=dialect, **kwds)
self.encoding = encoding
def writerow(self, row):
self.writer.writerow([s.encode("utf-8") for s in row])
def writerows(self, rows):
for row in rows:
self.writerow(row)
\end{verbatim}
They should work just like the \class{csv.reader} and \class{csv.writer}
classes but add an \var{encoding} parameter.
--------------------------------------------------------------------------
Thx,
Skip
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