On Jan 7, 7:15 pm, jo3c <[EMAIL PROTECTED]> wrote:
> hi everybody
> im a newbie in python
> i need to read line 4 from a header file
> using linecache will crash my computer due to memory loading, because
> i am working on 2000 files each is 8mb
>
> fileinput don't load the file into memory first
> how do i use fileinput module to read a specific line from a file?
>
> for line in fileinput.Fileinput('sample.txt')
> ????
Assuming it's a text file, you could use something like this:
lnum = 0 # line number
for line in file("sample.txt"):
lnum += 1
if lnum >= 4: break
The variable "line" should end up with the contents of line 4 if I am
not mistaken. To handle multiple files, just wrap that code like this:
for file0 in files:
lnum = 0 # line number
for line in file(file0):
lnum += 1
if lnum >= 4: break
# do something with "line"
where "files" is a list of the files to be read.
That's not tested.
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