Mark Dickinson added the comment:

Updated patch.  I've also taken the opportunity to increase MAX_ABS_EXP, which 
fixes the following long-standing bug (not that anyone has noticed it in the 
last 4 years, apparently):

>>> s = '0.' + '0'*19999 + '1e+20000'
>>> float(s)  # should be 1.0
0.1

(The new limit on the number of digits means that the clipping of the exponent 
can no longer result in incorrect results from strtod.)

Unlike the previous patch, I'm reasonably confident in this one. :-)  I'll plan 
to apply it soon, though it probably won't make 3.4 beta 1.

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Added file: http://bugs.python.org/file32817/limit_dtoa_string_v2.patch

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