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Utilities to help with using CSV IO.
See also: http://docs.python.org/2/library/csv.html#csv-examples
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| #-*- coding:utf-8 -*- | |
| """ | |
| ==================================== | |
| Utilities to help with using CSV IO | |
| ==================================== | |
| Example usage | |
| ------------- | |
| Code that used to do this:: | |
| writer = csv.writer(open('/path/to/file.csv')) | |
| Can now do this to work with Unicode:: | |
| writer = UnicodeWriter(open('/path/to/file.csv')) | |
| ---- | |
| .. seealso:: | |
| * `Python csv docs <http://docs.python.org/2/library/csv.html#csv-examples>`_ | |
| * https://gist.github.com/ewalstad/8325465 | |
| """ | |
| import csv, codecs, cStringIO | |
| class UTF8Recoder: | |
| """ | |
| Iterator that reads an encoded stream and reencodes the input to UTF-8 | |
| """ | |
| def __init__(self, f, encoding): | |
| self.reader = codecs.getreader(encoding)(f) | |
| def __iter__(self): | |
| return self | |
| def next(self): | |
| return self.reader.next().encode("utf-8") | |
| class UnicodeReader: | |
| """ | |
| A CSV reader which will iterate over lines in the CSV file "f", | |
| which is encoded in the given encoding. | |
| """ | |
| def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds): | |
| f = UTF8Recoder(f, encoding) | |
| self.reader = csv.reader(f, dialect=dialect, **kwds) | |
| def next(self): | |
| row = self.reader.next() | |
| return [unicode(s, "utf-8") for s in row] | |
| def __iter__(self): | |
| return self | |
| @property | |
| def line_num(self): | |
| """The number of lines read from the source iterator. This is not the | |
| same as the number of records returned, as records can span multiple | |
| lines.""" | |
| return self.reader.line_num | |
| @property | |
| def dialect(self): | |
| """A read-only description of the dialect in use by the parser.""" | |
| return self.reader.dialect | |
| class UnicodeWriter: | |
| """ | |
| A CSV writer which will write rows to CSV file "f", | |
| which is encoded in the given encoding. | |
| """ | |
| def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds): | |
| # Redirect output to a queue | |
| self.queue = cStringIO.StringIO() | |
| self.writer = csv.writer(self.queue, dialect=dialect, **kwds) | |
| self.stream = f | |
| self.encoder = codecs.getincrementalencoder(encoding)() | |
| def writerow(self, row): | |
| self.writer.writerow([s.encode("utf-8") for s in row]) | |
| # Fetch UTF-8 output from the queue ... | |
| data = self.queue.getvalue() | |
| data = data.decode("utf-8") | |
| # ... and reencode it into the target encoding | |
| data = self.encoder.encode(data) | |
| # write to the target stream | |
| self.stream.write(data) | |
| # empty queue | |
| self.queue.truncate(0) | |
| def writerows(self, rows): | |
| for row in rows: | |
| self.writerow(row) |
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