Python二分查找函数print语句延迟输出问题求助

这不是time.sleep的问题，而是Python的输出缓冲机制导致的。默认情况下，标准输出（stdout）会采用行缓冲或块缓冲策略，在部分环境中，缓冲会把所有print内容暂存起来，直到缓冲区满或程序结束才一次性输出。

解决方法很直接，给所有print语句加上flush=True参数，强制实时刷新缓冲区：

def start_search(self):
        check_count = 1
        while not self.upper_bound == self.target_number:
            time.sleep(0.01)
            middle = self.get_half(self.lower_bound, self.upper_bound)
            print(f"checking between {self.lower_bound} and {self.upper_bound}", flush=True)
            if middle > self.target_number:
                print(f"Midpoint of {middle} is higher,", flush=True)
                self.upper_bound = middle
            elif middle < self.target_number:
                print(f"Midpoint of {middle} is lower,", flush=True)
                self.lower_bound = middle
            else:
                print(f"Found value at midpoint {middle} after {check_count} check(s)", flush=True)
                self.upper_bound = middle
            check_count += 1

另外提个小优化：找到目标值时直接用break退出循环，代码逻辑会更清晰，不用特意修改upper_bound：

else:
    print(f"Found value at midpoint {middle} after {check_count} check(s)", flush=True)
    break

内容的提问来源于stack exchange，提问作者Otis