On 4/6/2010 2:16 AM, ranjan das wrote:
Hi,
I am new to python, and specially to file handling.
I need to write a program which reads a unique string in a file and
corresponding to the unique string, extracts/reads the n-th line (from
the line in which the unique string occurs).
I say 'n-th line' as I seek a generalized way of doing it.
For instance lets say the unique string is "documentation" (and
"documentation" occurs more than once in the file). Now, on each
instance that the string "documentation" occurs in the file, I want
to read the 25th line (from the line in which the string
"documentation" occurs)
Is there a goto kind of function in python?
Others have offered linecache and seek.
The simplest generic solution is:
lines_to_be_read = []
for lineno, line in enumerate(open(filename)):
if "documentation" in line:
lines_to_be_read.append(lineno + 25)
if lineno in lines_to_be_read:
# process this line
lines_to_be_read.pop(0)
--
Bob Gailer
919-636-4239
Chapel Hill NC
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