File /tmp/2147483648zeros is 2^31 (2GiB) zero-bytes ('\0').

Readline method works fine:
>>> fh = open('/tmp/2147483648zeros', 'rb')
>>> line = fh.readline()
>>> len(line)
2147483648

However when I try to iterate over the file:
>>> fh = open('/tmp/2147483648zeros', 'rb')
>>> for line in fh:
...   print len(line)

SystemError                         Traceback (most recent call last)
/home/jkowalski/<ipython-input-55-aaa9ddb42aea> in <module>()
----> 1 for line in fh:
      2     print len(line)
      3 
SystemError: Negative size passed to PyString_FromStringAndSize


Same is for greater files (issue discovered for 2243973120 B).
For a shorter file iteration works as expected.


File /tmp/2147483647zeros is 2^31 - 1 (< 2GiB) zero-bytes.
>>> fh = open('/tmp/2147483647zeros', 'rb')
>>> for line in fh:
...   print len(line)
2147483647


I guess the variable used for size is of 32bit signed type.

I am using Python 2.7.3 (default, Feb 27 2014, 19:58:35) with IPython 0.12.1 on Ubuntu 12.04.5 LTS.