New issue 2673: PyPy3 failure with pandas C-engine
https://bitbucket.org/pypy/pypy/issues/2673/pypy3-failure-with-pandas-c-engine
Omer Ben-Amram:
I have both pypy2 and pypy3 installed on my mac.
I'm running into this error when trying to read from a csv
```
import sys
print(sys.version)
> 3.5.3 (d72f9800a42b, Oct 06 2017, 09:04:27)
[PyPy 5.9.0-beta0 with GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.37)]
```
```python
import pandas as pd
df = pd.DataFrame({'a': 1, 'b': 2}, index=pd.RangeIndex(2))
df.to_csv('test.csv')
pd.read_csv('./test.csv')
```
```
ValueErrorTraceback (most recent call last)
<ipython-input-11-beb04ea51840> in <module>()
4 df.to_csv('test.csv')
5
----> 6 pd.read_csv('./test.csv')
~/pypy3-5.9-osx/site-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)
653 skip_blank_lines=skip_blank_lines)
654
--> 655 return _read(filepath_or_buffer, kwds)
656
657 parser_f.__name__ = name
~/pypy3-5.9-osx/site-packages/pandas/io/parsers.py in _read(filepath_or_buffer,
kwds)
403
404 # Create the parser.
--> 405 parser = TextFileReader(filepath_or_buffer, **kwds)
406
407 if chunksize or iterator:
~/pypy3-5.9-osx/site-packages/pandas/io/parsers.py in __init__(self, f, engine,
**kwds)
762 self.options['has_index_names'] = kwds['has_index_names']
763
--> 764 self._make_engine(self.engine)
765
766 def close(self):
~/pypy3-5.9-osx/site-packages/pandas/io/parsers.py in _make_engine(self, engine)
983 def _make_engine(self, engine='c'):
984 if engine == 'c':
--> 985 self._engine = CParserWrapper(self.f, **self.options)
986 else:
987 if engine == 'python':
~/pypy3-5.9-osx/site-packages/pandas/io/parsers.py in __init__(self, src,
**kwds)
1603 kwds['allow_leading_cols'] = self.index_col is not False
1604
-> 1605 self._reader = parsers.TextReader(src, **kwds)
1606
1607 # XXX
ValueError: only single character unicode strings can be converted to Py_UCS4,
got length 0
```
It will work if I specify to use the "python" engine :
`pd.read_csv('./test.csv', engine='python')`
It also works with pypy2 5.9 with the C engine.
Any idea on why this might be happening?
I'm aware that `Py_UCS4` does not exist in python2, but I'm not sure what would
cause that, maybe some incomparability with cpyext?
Thanks!
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