read a text file, find all integers, append to list

[Pedroski55]

What I mean is, certain, "Python objects", for instance the result of csv.reader() can only be used 1 time. I just wonder why.

Example:

import csv
myfile = '/home/pedro/myPython/csv/time.csv'
csv_reader = csv.reader(myfile, delimiter=',')
for row in csv_reader:
    print(row)

Output:
['time', ' comment']
['2022-04-25 7:06 AM', ' bla ']
['2022-04-25 7:07 AM', ' blabla']
['2022-04-25 7:08 AM', ' ha']
['2022-04-25 7:09 AM', ' haha']

But, if you try to use csv_reader again, it's gone!

for row in csv_reader:
    print(row)

You get nothing, csv_reader is "burned" and unavailable. You would have to read it in again.

That was the same with your code in this thread. I didn't put *Nset in the text file, so the whole of file was searched.

After that file was unavailable for the second loop.

I just wonder why that is.

For practical purposes, I read csv_reader into a list, which remains available for as many uses as I want.