"Split" file and comparison with CSV

[morgandebray]

Yes I did, I don't understand this part (I should have told, sorry) :

for line in in_file:
        if block and line.strip() == '/##/':
            do_comparison(block=block)
            block = []
        block.append(line) # eventually use line.strip() to remove trailing new line \n
    do_comparison(block) # that is for the last block

[buran]

input_file = 'input_file.txt' # '/path/to/inputfile.txt'

def do_comparison(block):
    # do comparison here
    print(block)
    

with open(input_file) as in_file:
    header = next(in_file) # read the header
    block = [] # start with empty list, i.e. first block
    for line in in_file: # iterate over lines in the input file after the header
        if block and line.strip() == '/##/': # if block is not empty list and the line is /##/ - that is a start of new block
            do_comparison(block=block) # call comparison function
            block = [] # reset the block to be empty list again, i.e. start new block
        block.append(line) # add line to block. eventually use line.strip() to remove trailing new line \n
    do_comparison(block) # that is comparison for the last block

[morgandebray]

Ok thanks, it's more clear. Do you think I can work with file for the moment and when it's over, change the code to do this ?

With the files, I think it would be easier not to get lost for the moment...

And why do I have to do block=block ? do_comparison(block) isn't enough (like for the last one) ?

[buran]

you can do like I did on the last line:

do_comparison(block)

in this case you will pass block as positional argument
in my code I pass block as keyword argument. i.e. on the left side is the keyword block and the right-hand side is the value (i.e. block variable) I pass as argument.
In this case you can use both ways. But there are cases when you are allowed to pass only positional or only keyword arguments. I use keyword arguments as it makes code a bit more readable.
Also note you can use different variable name, not block, e.g.

with open(input_file) as in_file:
    header = next(in_file) # read the header
    foo = [] # start with empty list, i.e. first block
    for line in in_file: # iterate over lines in the input file after the header
        if foo and line.strip() == '/##/': # if foo is not empty list and the line is /##/ - that is a start of new block
            do_comparison(block=foo) # call comparison function
            foo = [] # reset the block to be empty list again, i.e. start new block
        foo.append(line) # add line to block. eventually use line.strip() to remove trailing new line \n
    do_comparison(foo) # that is comp

[morgandebray]

Ok thanks, I think I got it. I'll come back if I have other problem !