Re: pre-check for string-to-number conversion
From: Steven Bethard (steven.bethard_at_gmail.com)
Date: 02/12/05
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Date: Fri, 11 Feb 2005 16:26:02 -0700
18k11tm001@sneakemail.com wrote:
> I am reading an ASCII data file and converting some of the strings to
> integers or floats. However, some of the data is corrupted and the
> conversion doesn't work. I know that I can us exceptions, but they
> don't seem like the cleanest and simplest solution to me.
You should reconsider this thought. It's quite clean and fast:
for s in get_ASCII_strings_from_data_file():
try:
f = float(s)
except ValueError:
do_whatever_you_need_to_do_for_invalid_data()
> I would like to simply perform a pre-check before I do the
> conversion, but I can't figure out how to do it.
Again, this is the less Pythonic approach, but one option would be to
use regular expressions:
matcher = re.compile(r'[\d.]+')
for s in get_ASCII_strings_from_data_file():
if matcher.match(s):
f = float(s)
else:
do_whatever_you_need_to_do_for_invalid_data()
but note that this won't except valid floats like '1e10'. You'll also
note that this is actually less concise than the exception based approach.
Steve
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