Remove blank lines from the bottom of a file when using while loop to check each line

[Peter9588]

I am trying to read in every line from a given file and check (amongst other things) that the 3rd character of every line is a ';' (a semi colon). The files i make to go into my database needs to have every line with a two letter identifier followed by a semi colon.

The issue I am having is that the while loop goes through every line fine and does examine the semi colon correctly, but always reports that there is a problem with the last line of the file, because it is whitespace...

I have tried stripping lines, and getting the file loop to run only when the line has characters in it... but this seems to disable the while loop from working at all.

See code Below.

# takes in each individual line of the file	
line = fileIN.readline()	 

# counter
x = 1

# while loop
while line:
# != None: 
# != re.sub("\n\s*\n*", "\n", line):
    
	line = fileIN.readline()
	
	line.strip()
	
	# checks that each line has a semi colon after each identifier
	if line[2:3] != ";":
		print "\nThere is a problem with the identifier on line", x + 1
		print line

Thanks in advance!
Pete

[Glenton]

Hi Pete. Please use code tags when posting - it's very difficult to read otherwise. In fact your code makes me want to scream and run holding my head.

That said, the task in hand should not be so very difficult. I normally try to engage in the code people give - if you want me to do so, please re-post it. But in the mean time, I would do it like this:

fileIn=open("whatever.txt")
for i,line in enumerate(fileIn):
    if line.strip()=="": continue  #if the line is blank, go to the next line
    if line[2]!=";":
        print "It's going nuts on line",i+1
        print line
fileIn.close()

I haven't tested it, but it should work. I'm not 100% sure that enumerate works on a file object, but if you have any problems post back.

In fact post back anyway, to let us know how it's going and what you get done.

[Peter9588]

Hi Pete. Please use code tags when posting - it's very difficult to read otherwise. In fact your code makes me want to scream and run holding my head.

That said, the task in hand should not be so very difficult. I normally try to engage in the code people give - if you want me to do so, please re-post it. But in the mean time, I would do it like this:

fileIn=open("whatever.txt")
for i,line in enumerate(fileIn):
    if line.strip()=="": continue  #if the line is blank, go to the next line
    if line[2]!=";":
        print "It's going nuts on line",i+1
        print line
fileIn.close()

I haven't tested it, but it should work. I'm not 100% sure that enumerate works on a file object, but if you have any problems post back.

In fact post back anyway, to let us know how it's going and what you get done.

Thanks very much

I manage to solve my problem, I think it was due to having two 'readin() lines'

i removed one and it seemed to fix the problem.