import sys, time, threading

HORIZONTAL_VALUE = False

def loading_bar_square():
    global HORIZONTAL_VALUE
    sys.stdout.write("[")
    while not HORIZONTAL_VALUE:
        time.sleep(0.1)
        sys.stdout.write("|]")
        time.sleep(0.1)
        sys.stdout.write("\b\b")
        sys.stdout.flush()
        sys.stdout.write("/]")
        time.sleep(0.1)
        sys.stdout.write("\b\b")
        sys.stdout.flush()
        sys.stdout.write("-]")
        time.sleep(0.1)
        sys.stdout.write("\b\b")
        sys.stdout.flush()
        sys.stdout.write("\\]")
        sys.stdout.write("\b\b")
        sys.stdout.flush()
    HORIZONTAL_VALUE = False

thread = threading.Thread(target=loading_bar_square)
thread.start()
time.sleep(4)

HORIZONTAL_VALUE = True
sys.stdout.write("\b\b\b[DONE]\n")
sys.stdout.flush()
a = input("Enter:")


----result-----
zenix@linux-xk05:~/Desktop> python3 py.py
[DONE]
Ente\]