cannot go back to shell normally after quitting using Ctrl-C or Ctrl-D

[tddschn]

sys setup: macOS 10.14.5, python2.7
shell: zsh 5.7.1

running script can be stopped by sending KeyboardInterrupt with Ctrl-C, but won't go back to the shell before running the script normally.

$ sgp -c sh000001 # sgp is a zsh alias 
***** start *****
名称     股价
深证成指 8922.69
上证指数 2898.6961
上证指数 2898.6961
***** end *****

***** start *****
名称     股价
深证成指 8922.69
上证指数 2898.6961
上证指数 2898.6961
***** end *****

^CTraceback (most recent call last):
  File "/Users/tscapple/bin/stock-get-price", line 102, in <module>
    time.sleep(options.sleep_time)
KeyboardInterrupt

Ctrl-D won't help either. Have to kill this session.