Python编程：使用doctest进行文档测试

# -*- coding: utf-8 -*-
def add(x, y):
    """
    求和 x + y
    Args:
        x: int
        y: int
    Returns:
        int
    eg:
    >>> add(1, 1)
    2
    >>> add(5, 5)
    10
    >>> 2/0
    Traceback (most recent call last):
        ...
    ZeroDivisionError: division by zero
    """
    return x + y * 2
if __name__ == '__main__':
    import doctest
    doctest.testmod()

**********************************************************************
Failed example:
    add(1, 1)
Expected:
    2
Got:
    3
**********************************************************************
Failed example:
    add(5, 5)
Expected:
    10
Got:
    15
**********************************************************************
1 items had failures:
   2 of   2 in __main__.add
***Test Failed*** 2 failures.
Process finished with exit code 0