Question

我是python的新手，只是学习如何调试和测试我的代码。我们必须为课程编写一个小的BMI计算器。但是，如果我尝试通过测试运行它，则会收到错误消息：

Please enter only non-negative numbers.
Failure <Click to see difference>

**********************************************************************
File "C:/Users/TAGI/PycharmProjects/703410_U7_Tests/Programs/BMI/task.py", line 39, in task.bmi
Failed example:
    bmi(-1, 200)
Expected:
    Please enter only non-negative numbers.
Got:
    Please enter only non-negative numbers.
    -0.25

为什么在引发异常后仍然使用负数计算结果？如果我注释掉我的doctests并在没有它的情况下尝试，那就很好。这是我的代码（已注释掉doctests）：

def check_variables(a):
    try:
        float(a)
        if a < 0:
            raise ValueError
    except ValueError:
        print("Please enter only non-negative numbers.")
    except:
        print("This is an error: something went wrong. Please try again.")
    return a


def bmi(a_weight, a_height):
    # TODO: write docstring for this function
    """
    This function returns the bmi of a person and tests the values. If they are invalid it returns an error.
    :param a_weight: a real number, the users weight
    :param a_height: a real number, the users height
    :return: bmi of user
    :rtype: float

    # >>> bmi(10,0)
    Traceback (most recent call last):
        ...
    ZeroDivisionError: float division by zero
    # >>> round(bmi(75,175), 1)
    24.5
    # >>> bmi("abc",177)
    Traceback (most recent call last):
        ...
    TypeError: unsupported operand type(s) for /: 'str' and 'float'
    # >>> bmi(0, 180)
    0.0
    # >>> bmi(-1, 200)
    Please enter only non-negative numbers.
    # >>> bmi(100, -40)
    Please enter only non-negative numbers.

       # TODO: write doctest for this function
    """
        return check_variables(a_weight) / (check_variables(a_height)/100) ** 2


bmi(-10, 180)

我的doctest无法正常运行，如果没有doctest，它将正常运行

0 个答案: