Is there a string.isnumeric function?

Question

I am already using string.letters, string.digits and string.hexdigits to validate some of my User Input Fields. However, I have a need to validate a floating point number but cannot seem to find an equivalent call. No decimal point is acceptable as is one, but two or more should flag an Error! Is there function for this or do I need write my own validation routine?

Thank you...

http://www.tutorialspoint.com/python/string_isnumeric.htm – Tim Oct 27 '14 at 14:18 — Tim, Oct 27 '14 at 14:18
@Tim doesn't work with floating points though... – Jon Clements Oct 27 '14 at 14:21 — Jon Clements, Oct 27 '14 at 14:21
@Jon i know but after reading the title i couldn't resist – Tim Oct 27 '14 at 14:22 — Tim, Oct 27 '14 at 14:22

score 2 · Accepted Answer · answered Oct 27 '14 at 14:21

2

There is one, but it doesn't work for decimal points. You could easily write what you want, however, by catching the ValueError:

def is_numeric_inc_point(s):
    try:
        float(s)
    except ValueError:
        return False
    return True

Demo:

>>> is_numeric_inc_point('5')
True
>>> is_numeric_inc_point('4.8')
True
>>> is_numeric_inc_point('6..2')
False

answered Oct 27 '14 at 14:21

anon582847382

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Used this but also wrote a few of my own to check for date/time formats, e.g. 4/11/2014 12:13:14". – MichaelJohn Nov 04 '14 at 12:39

Is there a string.isnumeric function?

1 Answers1