tail -f in python with no time.sleep

tail -f in python with no time.sleep

To implement a tail -f-like functionality in Python without using time.sleep, you can use the inotify library for Linux systems, which allows you to monitor file changes in real-time. You can install the inotify_simple package using pip:

pip install inotify_simple

Here's a Python script that demonstrates how to use inotify to tail a file without time.sleep:

from inotify_simple import INotify import os def tailf(filename): inotify = INotify() wd = inotify.add_watch(filename, mask=INotify.MODIFY) try: while True: for event in inotify.read(): if event.mask & INotify.MODIFY: with open(filename, 'r') as file: file.seek(0, os.SEEK_END) # Move to the end of the file data = file.read() print(data, end='') except KeyboardInterrupt: pass finally: inotify.rm_watch(wd) if __name__ == "__main__": filename = 'your_file.log' # Replace with the name of the file you want to tail tailf(filename)

This script uses the inotify_simple library to watch for file modification events (INotify.MODIFY). When a modification occurs, it reads and prints the newly appended content. The script will run indefinitely until you interrupt it with a keyboard interrupt (Ctrl+C).

Make sure to replace 'your_file.log' with the path to the file you want to tail.

Examples

  1. "Real-time tail -f implementation in Python without time.sleep" Description: Learn how to implement a real-time file monitoring functionality in Python akin to tail -f command without using time.sleep.

    import os def follow(file): file.seek(0, os.SEEK_END) while True: line = file.readline() if not line: continue yield line # Example usage: with open('logfile.txt', 'r') as f: loglines = follow(f) for line in loglines: print(line, end='')

  2. "Python tail -f alternative without polling" Description: Discover a Python alternative to tail -f command without constantly polling the file for changes.

    import os import select def tail_follow(file): while True: ready = select.select([file], [], [], 0.1) if ready[0]: line = file.readline() if line: yield line else: yield '' # Example usage: with open('logfile.txt', 'r') as f: loglines = tail_follow(f) for line in loglines: print(line, end='')

  3. "Python non-blocking tail -f implementation" Description: Implement a non-blocking tail -f like functionality in Python for monitoring file changes without relying on blocking time.sleep.

    import os import select def non_blocking_tail(file): file.seek(0, os.SEEK_END) while True: ready = select.select([file], [], [], 0.1) if ready[0]: line = file.readline() if line: yield line else: yield '' # Example usage: with open('logfile.txt', 'r') as f: loglines = non_blocking_tail(f) for line in loglines: print(line, end='')

  4. "Python tail -f without sleep for real-time monitoring" Description: Achieve real-time file monitoring in Python similar to tail -f command without resorting to sleep-based polling.

    import os import select def tail_no_sleep(file): while True: ready = select.select([file], [], []) if ready[0]: line = file.readline() if line: yield line else: yield '' # Example usage: with open('logfile.txt', 'r') as f: loglines = tail_no_sleep(f) for line in loglines: print(line, end='')

  5. "Python tail -f implementation with file descriptor" Description: Implement a tail -f like functionality in Python using file descriptor without relying on time.sleep for file monitoring.

    import os def tail_with_fd(file): fd = file.fileno() while True: line = os.read(fd, 1024).decode('utf-8') if line: yield line # Example usage: with open('logfile.txt', 'r') as f: loglines = tail_with_fd(f) for line in loglines: print(line, end='')

  6. "Python tail -f without busy waiting" Description: Implement a non-busy waiting tail -f alternative in Python for real-time file monitoring without using time.sleep.

    import os import select def tail_no_busy_wait(file): file.seek(0, os.SEEK_END) while True: ready = select.select([file], [], []) if ready[0]: line = file.readline() if line: yield line else: yield '' # Example usage: with open('logfile.txt', 'r') as f: loglines = tail_no_busy_wait(f) for line in loglines: print(line, end='')

  7. "Python tail -f without polling for real-time updates" Description: Implement a Python solution for real-time file monitoring similar to tail -f command without resorting to constant polling using time.sleep.

    import os import select def tail_no_polling(file): while True: ready = select.select([file], [], []) if ready[0]: line = file.readline() if line: yield line else: yield '' # Example usage: with open('logfile.txt', 'r') as f: loglines = tail_no_polling(f) for line in loglines: print(line, end='')

  8. "Python tail -f with file descriptor and no sleep" Description: Explore a Python implementation of tail -f using file descriptor for real-time file monitoring without relying on sleep-based delays.

    import os def tail_fd_no_sleep(file): fd = file.fileno() while True: line = os.read(fd, 1024).decode('utf-8') if line: yield line # Example usage: with open('logfile.txt', 'r') as f: loglines = tail_fd_no_sleep(f) for line in loglines: print(line, end='')

  9. "Python tail -f with non-blocking file read" Description: Implement a Python solution for tail -f functionality using non-blocking file reads to achieve real-time file monitoring without time.sleep.

    import os import fcntl def tail_non_blocking(file): fd = file.fileno() fcntl.fcntl(fd, fcntl.F_SETFL, os.O_NONBLOCK) while True: try: line = os.read(fd, 1024).decode('utf-8') if line: yield line except BlockingIOError: pass # Example usage: with open('logfile.txt', 'r') as f: loglines = tail_non_blocking(f) for line in loglines: print(line, end='')

  10. "Python tail -f with select module" Description: Utilize Python's select module to implement a non-blocking tail -f alternative for real-time file monitoring without relying on time.sleep.

    import os import select def tail_with_select(file): while True: ready = select.select([file], [], []) if ready[0]: line = file.readline() if line: yield line else: yield '' # Example usage: with open('logfile.txt', 'r') as f: loglines = tail_with_select(f) for line in loglines: print(line, end='')

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