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December 13, 2023 13:11
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python, redis - live lucky draw
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| import redis | |
| conn = redis.StrictRedis.from_url("redis://localhost:6379/0") | |
| set_name = "set-containing-elements-to-draw" | |
| def draw(conn, set_name, how_many=1): | |
| import time | |
| while True: | |
| try: | |
| # continuously print available tickets | |
| print(f"\r{conn.srandmember(set_name)}", end="") | |
| time.sleep(0.05) | |
| except KeyboardInterrupt: # Ctrl-C to stop printing and draw winners | |
| drawn = conn.spop(set_name, count=how_many) # randomly draw multiple tickets at once | |
| first_line = True | |
| prefix = "\r" | |
| for i, elem in enumerate(drawn): # print winners line-by-line, just for show | |
| num = f"#{i + 1}" | |
| print(f"{prefix}Drawn {num:>4}: {elem}") | |
| if first_line: | |
| first_line = False | |
| prefix = "" | |
| break | |
| print(f"\nTickets remaining: {conn.scard(set_name)}") |
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