I am trying to copy the MovieLens dataset into a Pandas dataframe in Python.
movies = pd.read_csv('http://files.grouplens.org/datasets/movielens/ml-100k/u.item', sep='|', names = ['movie_id', 'title'], usecols = range(2))
movies.head()
However, I get the following error when I do the above.
UnicodeDecodeError Traceback (most recent call last)
pandas/_libs/parsers.pyx in pandas._libs.parsers.TextReader._convert_tokens()
pandas/_libs/parsers.pyx in pandas._libs.parsers.TextReader._convert_with_dtype()
pandas/_libs/parsers.pyx in pandas._libs.parsers.TextReader._string_convert()
pandas/_libs/parsers.pyx in pandas._libs.parsers._string_box_utf8()
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe9 in position 3: invalid continuation byte
During handling of the above exception, another exception occurred:
UnicodeDecodeError Traceback (most recent call last)
in ()
8
9
---> 10 movies = pd.read_csv('http://files.grouplens.org/datasets/movielens/ml-100k/u.item', sep='|', names = ['movie_id', 'title'], usecols = range(2))
11 movies.head()
/usr/local/lib/python3.5/dist-packages/pandas/io/parsers.py in parser_f(filepath_or_buffer, sep, delimiter, header, names, index_col, usecols, squeeze, prefix, mangle_dupe_cols, dtype, engine, converters, true_values, false_values, skipinitialspace, skiprows, nrows, na_values, keep_default_na, na_filter, verbose, skip_blank_lines, parse_dates, infer_datetime_format, keep_date_col, date_parser, dayfirst, iterator, chunksize, compression, thousands, decimal, lineterminator, quotechar, quoting, escapechar, comment, encoding, dialect, tupleize_cols, error_bad_lines, warn_bad_lines, skipfooter, skip_footer, doublequote, delim_whitespace, as_recarray, compact_ints, use_unsigned, low_memory, buffer_lines, memory_map, float_precision)
703 skip_blank_lines=skip_blank_lines)
704
--> 705 return _read(filepath_or_buffer, kwds)
706
707 parser_f.name = name
/usr/local/lib/python3.5/dist-packages/pandas/io/parsers.py in _read(filepath_or_buffer, kwds)
449
450 try:
--> 451 data = parser.read(nrows)
452 finally:
453 parser.close()
/usr/local/lib/python3.5/dist-packages/pandas/io/parsers.py in read(self, nrows)
1063 raise ValueError('skipfooter not supported for iteration')
1064
-> 1065 ret = self._engine.read(nrows)
1066
1067 if self.options.get('as_recarray'):
/usr/local/lib/python3.5/dist-packages/pandas/io/parsers.py in read(self, nrows)
1826 def read(self, nrows=None):
1827 try:
-> 1828 data = self._reader.read(nrows)
1829 except StopIteration:
1830 if self._first_chunk:
pandas/_libs/parsers.pyx in pandas._libs.parsers.TextReader.read()
pandas/_libs/parsers.pyx in pandas._libs.parsers.TextReader._read_low_memory()
pandas/_libs/parsers.pyx in pandas._libs.parsers.TextReader._read_rows()
pandas/_libs/parsers.pyx in pandas._libs.parsers.TextReader._convert_column_data()
pandas/_libs/parsers.pyx in pandas._libs.parsers.TextReader._convert_tokens()
pandas/_libs/parsers.pyx in pandas._libs.parsers.TextReader._convert_with_dtype()
pandas/_libs/parsers.pyx in pandas._libs.parsers.TextReader._string_convert()
pandas/_libs/parsers.pyx in pandas._libs.parsers._string_box_utf8()
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe9 in position 3: invalid continuation byte
I am working in a Jupyter notebook in Python 3. How can I resolve the error?
Answer
That file isn't UTF-8 encoded. We can make a reasonable guess, though, and we can ask the chardet third-party library to help us out:
In [23]: import urllib, chardet
In [24]: url = 'http://files.grouplens.org/datasets/movielens/ml-100k/u.item'
In [25]: u = chardet.UniversalDetector()
In [26]: u.feed(urllib.request.urlopen(url).read())
In [27]: u.close()
Out[27]: {'confidence': 0.73, 'encoding': 'ISO-8859-1', 'language': ''}
In [28]: movies = pd.read_csv(url, sep='|', names = ['movie_id', 'title'],
usecols = range(2), encoding='iso-8859-1')
In [29]: movies.head()
Out[29]:
movie_id title
0 1 Toy Story (1995)
1 2 GoldenEye (1995)
2 3 Four Rooms (1995)
3 4 Get Shorty (1995)
4 5 Copycat (1995)
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