Thinking...

import sys, time

th = "Thinking"

print(th, end="", flush=True)

while True:

    for i in range(4):

        sys.stdout.write("\b" * 3)        # move back over dots

        sys.stdout.write("." * i + " " * (3 - i))

        sys.stdout.flush()

        time.sleep(0.5)

#Credits: CoPilot