On 03/15/2015 07:01 AM, Peter Otten wrote:
Probably not helpful, but I can provoke the behaviour you see by toggling
bytes with ctypes, thus simulating a corrupted str object:
Python 2.7.6 (default, Mar 22 2014, 22:59:56)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
import ctypes
s = "41.700000000000003"
ctypes.c_ubyte.from_address(id(s) + 16).value = 1
s
'4'
len(s)
1
float(s)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: invalid literal for float(): 41.700000000000003
int(s)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 10: '41.700000000000003'
I dug through the code and ctypes was in the mix. Without discovering
the actual issue, I did manage to work around the issue by replacing:
val = round(float(decval),1)
with
val = round(float("".join([ii if ii=="." else str(int(ii)) for ii in
decval])),1)
Thanks.
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