apt-get progress bar

demo.py

# based on https://mdk.fr/blog/how-apt-does-its-fancy-progress-bar.html
# to run: python -u ./demo.py
# notice the -u for unbuffered

import time
import os
from datetime import datetime

columns, lines = os.get_terminal_size()


def write(s):
    print(s, end="")
    time.sleep(0.2)


write("\n")  # Ensure the last line is available.
write("\0337")  # Save cursor position
write(f"\033[0;{lines-1}r")  # Reserve the bottom line
write("\0338")  # Restore the cursor position
write("\033[1A")  # Move up one line

try:
    for i in range(250):
        time.sleep(0.2)
        write(f"Hello {i}")
        write("\0337")  # Save cursor position
        write(f"\033[{lines};0f")  # Move cursor to the bottom margin
        write(datetime.now().isoformat())  # Write the date
        write("\0338")  # Restore cursor position
        write("\n")
except KeyboardInterrupt:
    pass
finally:
    write("\0337")  # Save cursor position
    write(f"\033[0;{lines}r")  # Drop margin reservation
    write(f"\033[{lines};0f")  # Move the cursor to the bottom line
    write("\033[0K")  # Clean that line
    write("\0338")  # Restore cursor position