I have this code segment working through a rather unsightly data file which has data that I need inserted in a neat manner.

i.e. the data file will have:

```
...
...
...
alphabetical text
13 42 54 67
31 12
different alphabetical text
25 41 23 76
98 45 38
...
...
...

```

and I need it written into a list of lists which reads:

```
[..., [13, 42, 54, 67, 31, 12], [25, 41, 23, 76, 98, 45, 38] ...]

```

I currently have this code:

```
if next_line[0].isalpha == True and line[0] == '1' or line[0] == '2' or line[0] == '3' or line[0] == '4' or line[0] == '5' or line[0] == '6' or line[0] == '7' or line[0] == '8' or line[0] == '9': #pardon my hard coding
    h = line.split()
    self.distances.append(h)
else:
    line_queue = []
    num_list = []
    for j in range(i, len(self.datlines)):
        check_line = self.datlines[j]
        if j != len(self.datlines)-1:
            next_check = self.datlines[j+1]
        if check_line[0] == '1' or check_line[0] == '2' or check_line[0] == '3' or check_line[0] == '4' or check_line[0] == '5' or check_line[0] == '6' or check_line[0] == '7' or check_line[0] == '8' or check_line[0] == '9':
            h = check_line.split()
            line_queue.append(h)
            for s in line_queue:
                if s != ' ' and s != '\n':
                    num_list.append(s)
            self.distances.append(num_list)
        if check_line[0].isalpha() == True:
            break

```

What it gives me occasionally is a list of a list of a list as such:

```
[..., [13, 42, 54, 67, 31, 12], [[25, 41, 23, 76, 98, 45, 38]] ...]

```

I've looked through it over and over again, but I cannot find where it is coming up with the extra list layer.

What exactly here is causing this to happen and how can I fix it?

Thank you so much