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Copyright 2010 Jeremy Dunck. All rights reserved. | |||
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Redistribution and use in source and binary forms, with or without modification, are | |||
permitted provided that the following conditions are met: | |||
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1. Redistributions of source code must retain the above copyright notice, this list of | |||
conditions and the following disclaimer. | |||
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2. Redistributions in binary form must reproduce the above copyright notice, this list | |||
of conditions and the following disclaimer in the documentation and/or other materials | |||
provided with the distribution. | |||
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THIS SOFTWARE IS PROVIDED BY JEREMY DUNCK ``AS IS'' AND ANY EXPRESS OR IMPLIED | |||
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | |||
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JEREMY DUNCK OR | |||
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |||
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |||
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |||
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |||
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |||
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |||
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The views and conclusions contained in the software and documentation are those of the | |||
authors and should not be interpreted as representing official policies, either expressed | |||
or implied, of Jeremy Dunck. |
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TL;DR: The unicodecsv is a drop-in replacement for Python 2's csv module which supports unicode strings without a hassle. | |||
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More fully: | |||
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Python 2's csv module doesn't easily deal with unicode strings, leading to the dreaded "'ascii' codec can't encode characters in position ..." exception. | |||
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You can work around it by encoding everything just before calling write (or just after read), but why not add support to the serializer? | |||
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>>> import unicodecsv | |||
>>> from cStringIO import StringIO | |||
>>> f = StringIO() | |||
>>> w = unicodecsv.writer(f, encoding='utf-8') | |||
>>> w.writerow((u'é', u'ñ')) | |||
>>> f.seek(0) | |||
>>> r = unicodecsv.reader(f, encoding='utf-8') | |||
>>> row = r.next() | |||
>>> print row[0], row[1] | |||
é ñ |
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# -*- coding: utf-8 -*- | |||
import csv | |||
from csv import * | |||
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def _stringify(s, encoding): | |||
if type(s)==unicode: | |||
return s.encode(encoding) | |||
elif type(s) != str: | |||
s=str(s) | |||
return s | |||
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def _stringify_list(l, encoding): | |||
return [_stringify(s, encoding) for s in l] | |||
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class UnicodeWriter(object): | |||
""" | |||
>>> import unicodecsv | |||
>>> from cStringIO import StringIO | |||
>>> f = StringIO() | |||
>>> w = unicodecsv.writer(f, encoding='utf-8') | |||
>>> w.writerow((u'é', u'ñ')) | |||
>>> f.seek(0) | |||
>>> r = unicodecsv.reader(f, encoding='utf-8') | |||
>>> row = r.next() | |||
>>> print row[0], row[1] | |||
é ñ | |||
""" | |||
def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds): | |||
self.writer = csv.writer(f) | |||
self.dialect = dialect | |||
self.encoding = encoding | |||
self.writer = csv.writer(f, dialect=dialect, **kwds) | |||
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def writerow(self, row): | |||
self.writer.writerow(_stringify_list(row, self.encoding)) | |||
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def writerows(self, rows): | |||
for row in rows: | |||
self.writerow(row) | |||
writer = UnicodeWriter | |||
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class UnicodeReader(object): | |||
def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds): | |||
self.reader = csv.reader(f, dialect=dialect, **kwds) | |||
self.encoding = encoding | |||
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def next(self): | |||
row = self.reader.next() | |||
return [unicode(s, self.encoding) for s in row] | |||
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def __iter__(self): | |||
return self | |||
reader = UnicodeReader | |||
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class DictWriter(csv.DictWriter): | |||
""" | |||
>>> from cStringIO import StringIO | |||
>>> f = StringIO() | |||
>>> w = DictWriter(f, ['a', 'b'], restval=u'î') | |||
>>> w.writerow({'a':'1'}) | |||
>>> w.writerow({'a':'1', 'b':u'ø'}) | |||
>>> w.writerow({'a':u'é'}) | |||
>>> f.seek(0) | |||
>>> r = DictReader(f, fieldnames=['a'], restkey='r') | |||
>>> r.next() == {'a':u'1', 'r':[u"î"]} | |||
True | |||
>>> r.next() == {'a':u'1', 'r':[u"ø"]} | |||
True | |||
>>> r.next() == {'a':u'é', 'r':[u"î"]} | |||
""" | |||
def __init__(self, csvfile, fieldnames, restval='', extrasaction='raise', dialect='excel', encoding='utf-8', *args, **kwds): | |||
self.fieldnames = fieldnames | |||
self.encoding = encoding | |||
self.restval = restval | |||
self.writer = csv.DictWriter(csvfile, fieldnames, restval, extrasaction, dialect, *args, **kwds) | |||
def writerow(self, d): | |||
for fieldname in self.fieldnames: | |||
if fieldname in d: | |||
d[fieldname] = _stringify(d[fieldname], self.encoding) | |||
else: | |||
d[fieldname] = _stringify(self.restval, self.encoding) | |||
self.writer.writerow(d) | |||
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class DictReader(csv.DictReader): | |||
def __init__(self, csvfile, fieldnames=None, restkey=None, restval=None, dialect='excel', encoding='utf-8', *args, **kwds): | |||
self.restkey = restkey | |||
self.encoding = encoding | |||
self.reader = csv.DictReader(csvfile, fieldnames, restkey, restval, dialect, *args, **kwds) | |||
def next(self): | |||
d = self.reader.next() | |||
for k, v in d.items(): | |||
if k == self.restkey: | |||
rest = v | |||
if rest: | |||
d[self.restkey] = [unicode(v, self.encoding) for v in rest] | |||
else: | |||
if v is not None: | |||
d[k] = unicode(v, self.encoding) | |||
return d |