timer
===
調整了範例，讓 timer `t` 可在任意位置取消 timer 的運作，指令 `t.cancel()`

import threading

# global t
t = None

def set_interval(func, sec):
    global t
    
    def func_wrapper():
        set_interval(func, sec)
        func()
        
    t = threading.Timer(sec, func_wrapper)
    t.start()

def call():
    print('hello!')

if __name__ == "__main__":
    set_interval(call, 3)

## Ref.
[[Python 常用] 實現 setInterval 定時器圈呼叫函式功能](https://andy6804tw.github.io/2021/01/21/time-interval/)

###### tags: `實作相關`