Python 的第三方调试库。让你通过装饰器方法，方便的知道每一行程序运行后的结果，而不需要再手动增加 `print` 展示过程数据、调试程序。示例代码： ```python import pysnooper @pysnooper.snoop() def number_to_bits(number): if number: bits = [] while number: number, remainder = divmod(number, 2) bits.insert(0, remainder) return bits else: return [0] number_to_bits(6) # 输出如下 Starting var:.. number = 6 15:29:11.327032 call 4 def number_to_bits(number): 15:29:11.327032 line 5 if number: 15:29:11.327032 line 6 bits = [] New var:....... bits = [] 15:29:11.327032 line 7 while number: 15:29:11.327032 line 8 number, remainder = divmod(number, 2) New var:....... remainder = 0 Modified var:.. number = 3 .... ```