This method truncates the file corresponding to file descriptor fd, so that it is at most length bytes in size.
Syntax:
os.ftruncate(fd, length)
Parameters:
Here is the detail of parameters:
fd: This is the file descriptor which needs to be truncated.
length: This is the length of the file where file needs to be truncated.
Example:
#!/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 - This is test")
# Now you can use ftruncate() method.
os.ftruncate(fd, 10)
# 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!!"
This would produce following result:
Read String is : This is te
Closed the file successfully!!