Message 229689 - Python tracker

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In-reply-to
Author	jnespolo
Recipients	jnespolo
Date	2014年10月19日.18:10:15
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1413742215.74.0.884028294997.issue22672@psf.upfronthosting.co.za>

Content
Argparse fails to recognise negative numbers in scientific notation as valid numbers. Example: Suppose the program test.py has this option. par.add_argument('-a', type=float) then './test.py -a -1e5' will fail, as well as -1.0e-4, -.5E+4 and variations thereof. Furthermore, at the current state, it seems that argparse does not recognize -1. as a valid float either. I tried to hack argparse.py myself, and I believe the patch attached should fix this issue. The base version of argparse.py is the one from Python 3.4.2 as found in Debian Sid. The modified regular expression seemed to behave correctly in all test cases I could come up with.

Content

Argparse fails to recognise negative numbers in scientific notation as valid numbers.
Example:
Suppose the program test.py has this option.
 par.add_argument('-a', type=float)
then './test.py -a -1e5' will fail, as well as -1.0e-4, -.5E+4 and variations thereof.
Furthermore, at the current state, it seems that argparse does not recognize -1. as a valid float either.
I tried to hack argparse.py myself, and I believe the patch attached should fix this issue. The base version of argparse.py is the one from Python 3.4.2 as found in Debian Sid.
The modified regular expression seemed to behave correctly in all test cases I could come up with.

History
Date	User	Action	Args
2014年10月19日 18:10:15	jnespolo	set	recipients: + jnespolo
2014年10月19日 18:10:15	jnespolo	set	messageid: <1413742215.74.0.884028294997.issue22672@psf.upfronthosting.co.za>
2014年10月19日 18:10:15	jnespolo	link	issue22672 messages
2014年10月19日 18:10:15	jnespolo	create

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