The method lseek() sets the current position of file descriptor fd to the given position pos, modified by how.
Following is the syntax for lseek() method ?
fd ? This is the file descriptor, which needs to be processed.
pos ? This is the position in the file with respect to given parameter how. You give os.SEEK_SET or 0 to set the position relative to the beginning of the file, os.SEEK_CUR or 1 to set it relative to the current position; os.SEEK_END or 2 to set it relative to the end of the file.
how ? This is the reference point with-in the file. os.SEEK_SET or 0 means beginning of the file, os.SEEK_CUR or 1 means the current position and os.SEEK_END or 2 means end of the file.
This method does not return any value.
The following example shows the usage of lseek() method.
import os, sys
# Open a file
fd = os.open( "foo.txt", os.O_RDWR|os.O_CREAT )
# Write one string
os.write(fd, "This is test")
# Now you can use fsync() method.
# Infact here you would not be able to see its effect.
# Now read this file from the beginning
os.lseek(fd, 0, 0)
str = os.read(fd, 100)
print "Read String is : ", str
# Close opened file
os.close( fd )
print "Closed the file successfully!!"
When we run above program, it produces following result ?
Read String is : This is test
Closed the file successfully!!