Scanning long string and adding extra character in Python

Question

I need to scan a long string to determine numbers and put commas after every number. But digits are not the same and randomly changes.

little sample = 14 194 180 119 195 213 175 220 133 24 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 72 288 319 345 275 145 5

Here is what I tried so far

for i in range(len(my_values)):
if my_values[i] in (range(999)):
    my_values[i] = ","

But It gave me strange output

['0', '\t', '0', '\t', '0', '\t', '0', '\t', '0', '\t', '1', '2', '5', '\t', '2', '7', '1', '\t', '3', '0', '8', '\t',

Note: isdigit or isNumeric functions are valid for one character. They did not work. What should I change to add commas on string after randomly changes number?

@DarrylG Yes. It is read from text file But I don't think reading part causes the challenge — Emre İriş
– Emre İriş, Commented Apr 14, 2020 at 17:03

Prakhar Saxena · Accepted Answer · 2020-04-14 17:06:31Z

1

You can simply try to break the string based on spaces/tab and combine the obtained elements using a comma:

new_str = ",".join(my_values.split(' '))    #or '\t' if they are separated by a tab

answered Apr 14, 2020 at 17:06

Prakhar Saxena

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2 Comments

Błotosmętek Over a year ago

Best use just .split(), without an argument.

Prakhar Saxena Over a year ago

@Błotosmętek Agreed!

MohitC · Accepted Answer · 2020-04-14 17:57:52Z

0

You can get all numbers as:

>>> import re
>>> a = re.findall('-?\d+\.?\d*', sample)
>>> a
['14', '194', '180', '119', '195', '213', '175', '220', '133', '24', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '72', '288', '319', '345', '275', '145', '5']

and then join as:

>>> ", ".join(a)
'14, 194, 180, 119, 195, 213, 175, 220, 133, 24, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 72, 288, 319, 345, 275, 145, 5'
>>>

edited Apr 14, 2020 at 17:57

answered Apr 14, 2020 at 17:08

MohitC

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5 Comments

Emre İriş Over a year ago

Thanks!. It did work. Can you explain what '\d+' part is doing?

MohitC Over a year ago

Its a regular expression to extract number with 1 or more digits. Do accept the answer if its working for you.

Emre İriş Over a year ago

I will :). There is a time duration. Thanks again

Błotosmętek Over a year ago

This works assuming there are no negative nor fractional numbers in the string.

Emre İriş Over a year ago

What if negative numbers also exist? Should we scan again?

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