In article <[EMAIL PROTECTED]>,
[EMAIL PROTECTED] wrote:
> hey there,
> i need to be able to get the index for an item in a list.
> the list is a list of lines read from a text file.
>
> like this:
>
> file = open("/home/somefile.text", "r")
> lines = file.readlines()
> file.close()
>
> now, i want to see if a certain string is == to one of the lines
> and if so, i need to know the index of that line.
Assuming you're already read the lines from the file with the above code,
something along the lines of the following will work:
for lineNumber, line in enumerate (lines):
whatever
But, starting from scratch, it'll be more efficient to do:
for lineNumber, line in enumerate (file ("filename")):
whatever
because it'll read lines one at a time as needed, instead of gulping them
all in at once and buffering them in memory. For small files (say, less
than a few hundred lines), it probably won't make any appreciable
difference, but for big files, it can be substantial.
BTW, enumerate() starts counting from 0; you might want to add 1 to what it
returns to get a file line number.
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