Python os.ftruncate() Method
The method ftruncate() truncates the file corresponding to file descriptor fd, so that it is at most length bytes in size.
Following is the syntax for ftruncate() method:
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.
This method does not return any value.
The following example shows the usage of ftruncate() 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 - 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!!"
When we run above program, it produces following result:
Read String is : This is te Closed the file successfully!!