util.py 文件源码

def _compare_eq_iterable(left, right, verbose=False):
    if not verbose:
        return [u('Use -v to get the full diff')]
    # dynamic import to speedup pytest
    import difflib

    try:
        left_formatting = pprint.pformat(left).splitlines()
        right_formatting = pprint.pformat(right).splitlines()
        explanation = [u('Full diff:')]
    except Exception:
        # hack: PrettyPrinter.pformat() in python 2 fails when formatting items that can't be sorted(), ie, calling
        # sorted() on a list would raise. See issue #718.
        # As a workaround, the full diff is generated by using the repr() string of each item of each container.
        left_formatting = sorted(repr(x) for x in left)
        right_formatting = sorted(repr(x) for x in right)
        explanation = [u('Full diff (fallback to calling repr on each item):')]
    explanation.extend(line.strip() for line in difflib.ndiff(left_formatting, right_formatting))
    return explanation