Find space in a line in a file

Question

I am reading a file line by line. I use a function to find specified characters in a line.

def find_all(a_str, sub):
    start = 0
    while True:
        start = a_str.find(sub, start)
        if start == -1: return
        yield start
        start += len(sub)

with open("file.txt", 'r', encoding='utf-8') as f:
    for line in f:                                                              
        a = list(find_all(line,"==")

This works fine, it will find "==" but I actually need this to find spaces which are somehow omitted when I use:

a = list(find_all(line," "))

What change do I need to make to find spaces?

Could you provide an example of an input and the expected result? — Vasilis G., Mar 26 '19 at 17:13
One thing you'll need to change is add a `)` at the end of your last line. — Hoog, Mar 26 '19 at 17:20

score 0 · Answer 1 · answered Mar 26 '19 at 17:19

0

I don't understand, this works perfectly :

list(find_all('This works perfectly doesn t it ?'," "))
[4, 10, 20, 26, 28, 31]

Could you provide your sample data ? Maybe your spaces are special characters ?

Also, I suppose you saw this, but just in case : Find all occurrences of a substring in Python

answered Mar 26 '19 at 17:19

Born Tbe Wasted

610
3
13

Yes this actually works, not sure why it's not working in my other code. And yes, the link you provided is where I borrowed it from. – Seb_ Mar 26 '19 at 17:24

score 0 · Answer 2 · answered Mar 26 '19 at 17:28

0

As @Hoog stated above, you are missing a parentheses at the end of your code.

def find_all(a_str, sub):
    start = 0
    while True:
        start = a_str.find(sub, start)
        if start == -1: return
        yield start
        start += len(sub)

with open("file.txt", 'r', encoding='utf-8') as f:
    for line in f:                                                              
        a = list(find_all(line,"==")) # << Right here

answered Mar 26 '19 at 17:28

David Culbreth

2,610
16
26

It was a typo, I've added it. Unfortunately adding it has no effect on the result – Seb_ Mar 26 '19 at 17:32

Find space in a line in a file

2 Answers2