Python | os.ftruncate() method
OS module in Python provides functions for interacting with the operating system. OS comes under Python’s standard utility modules. This module provides a portable way of using operating system dependent functionality.
os.ftruncate() 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:
fd: This is the file descriptor that is to be truncated.
length: This is the length of the file upto which file is to be truncated.Return Value: This method does not returns any value.
Example #1 :
Using os.ftruncate() method to truncate a file
# Python program to explain os.ftruncate() method # importing os module import os # path path = 'C:/Users/Rajnish/Desktop/testfile.txt' # Open the file and get # the file descriptor associated # with it using os.open() method fd = os.open(path, os.O_RDWR|os.O_CREAT) # String to be written s = 'zambiatek' # Convert the string to bytes line = str.encode(s) # Write the bytestring to the file # associated with the file # descriptor fd os.write(fd, line) # Using os.ftruncate() method os.ftruncate(fd, 5) # Seek the file from beginning # using os.lseek() method os.lseek(fd, 0, 0) # Read the file s = os.read(fd, 15) # Print string print(s) # Close the file descriptor os.close(fd) |
Output:
b'Geeks'
Example #2 :
Using os.ftruncate() method to truncate a file
# Python program to explain os.ftruncate() method # importing os module import os # path path = 'C:/Users/Rajnish/Desktop/testfile.txt' # Open the file and get # the file descriptor associated # with it using os.open() method fd = os.open(path, os.O_RDWR|os.O_CREAT) # String to be written s = 'zambiatek - Computer Science portal' # Convert the string to bytes line = str.encode(s) # Write the bytestring to the file # associated with the file # descriptor fd os.write(fd, line) # Using os.ftruncate() method os.ftruncate(fd, 10) # Seek the file from beginning # using os.lseek() method os.lseek(fd, 0, 0) # Read the file s = os.read(fd, 15) # Print string print(s) # Close the file descriptor os.close(fd) |
Output:
b'GeeksforGe'
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