How to get float in string?

Question

Write a program, input a string , and put all the numeric strings in the string (except for the tail punctuation, it can be an integer or a float, for example, '100times', N0; '56.78.23' in the sentence, No; '45.78.' at the end of the sentence, Yes; or a single number) is converted to a floating point number and output. If there is no numeric string, output:‘Not Found!’ . The following punctuation marks may be included in the string: ",", ".", "", "?", and "!", punctuation does not appear consecutively.

Example:

string = " one 5.67 two 56.78.23 three 34 four 45.78. "

Result:

['5.67','45.78','34']

Can you share some of the code you've written and what's not working? — wlchastain
– wlchastain, Commented Oct 25, 2019 at 15:09
Use a regexp to find all the numeric strings with re.findall(). — Barmar
– Barmar, Commented Oct 25, 2019 at 15:11
The problem description says that you're supposed to convert them to floating point numbers. Why does your desired result have strings in it? — Barmar
– Barmar, Commented Oct 25, 2019 at 15:12
Are you trying to find floats or numbers? Cause 34 is not a float? — DUDANF
– DUDANF, Commented Oct 25, 2019 at 15:34

yatu · Accepted Answer · 2019-10-25 15:28:34Z

1

The way I'd do this is splitting the string, and trying to cast to float in a try/except clause:

def find_floats(string):
    for i in string.rstrip('. ').split():
        try:
            float(i)
            yield i
        except ValueError:
            pass

list(find_floats(string))
# ['5.67', '34', '45.78.']

edited Oct 25, 2019 at 15:28

answered Oct 25, 2019 at 15:16

yatu

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6 Comments

DUDANF Over a year ago

Won't float(2) turn the int 2 into 2.0?

yatu Over a year ago

No, it is not being assigned anywhere... @daudnadeem

DUDANF Over a year ago

no I mean if I open up a python shell, and type float("string") I get a ValueError. However both float(1) and float(1.0) return 1.0

yatu Over a year ago

Yes, so? OP is looking for numeric values @daudnadeem

DUDANF Over a year ago

yes, I noticed that. However the question is misleading since it states "float in sting" and not "numbers in string"

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