python - python 中的 test() 函数？预订 "How to Think Like a Computer Scientist"

Question

我决定深入研究一下Python。我发现this book开始阅读它并做一些练习。现在我被困在第 6 章，正是 here 。抱歉我的新手问题，但是这个 test() 函数从哪里来？

def mysum(xs):
    """ Sum all the numbers in the list xs, and return the total. """
    running_total = 0
    for x in xs:
        running_total = running_total + x
    return running_total

#add tests like these to your test suite ...
test(mysum([1, 2, 3, 4]), 10)
test(mysum([1.25, 2.5, 1.75]), 5.5)
test(mysum([1, -2, 3]), 2)
test(mysum([ ]), 0)
test(mysum(range(11)), 55)    # Remember that 11 is not in the list that range generates.

我似乎找不到它，而且本书前面从未提到过它。我只找到了一个名为 test 的模块。现在我有点困惑，我错过了什么吗？本书还有一个针对 Python 2.x 的版本，在第 6 章中没有使用此函数......请赐教新手，对于这个奇怪的问题再次表示歉意。

Answer 1

位于 Section 6.7链接的章节。

def test(actual, expected):
    """ Compare the actual to the expected value,
        and print a suitable message.
    """
    import sys
    linenum = sys._getframe(1).f_lineno   # get the caller's line number.
    if (expected == actual):
        msg = "Test on line {0} passed.".format(linenum)
    else:
        msg = ("Test on line {0} failed. Expected '{1}', but got '{2}'."
                                     . format(linenum, expected, actual))
    print(msg)