Python Tutorial ( PDFDrive )

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os.lseek(fd, pos, how)
Description
The method lseek() sets the current position of file descriptor fd to the given position pos, modified byhow.
Syntax
Following is the syntax for lseek() method:
os.lseek(fd, pos, how)
Parameters
• 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.
Return Value
This method does not return any value.
Example
The following example shows the usage of lseek() method.
#!/usr/bin/python
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.
os.fsync(fd)
# 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 )
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