Closed
Description
In https://github.com/pydata/pandas/blob/master/pandas/io/parsers.py, the init method for FixedWidthReaders checks whether the colspecs are valid. Since None is a value slice index, should it be allowed as a colspec?
This would help me because I don't know the width of the last column until I start reading the file.
class FixedWidthReader(object):
"""
A reader of fixed-width lines.
"""
def __init__(self, f, colspecs, delimiter, comment):
self.f = f
self.buffer = None
self.delimiter = '\r\n' + delimiter if delimiter else '\n\r\t '
self.comment = comment
if colspecs == 'infer':
self.colspecs = self.detect_colspecs()
else:
self.colspecs = colspecs
if not isinstance(self.colspecs, (tuple, list)):
raise TypeError("column specifications must be a list or tuple, "
"input was a %r" % type(colspecs).__name__)
for colspec in self.colspecs:
if not (isinstance(colspec, (tuple, list)) and
len(colspec) == 2 and
isinstance(colspec[0], (int, np.integer)) and
isinstance(colspec[1], (int, np.integer))):
raise TypeError('Each column specification must be '
'2 element tuple or list of integers')