Location of the documentation

https://pandas.pydata.org/pandas-docs/stable/reference/indexing.html

Documentation problem

Index is described as a "set", but behaves as a multiset: len() counts each occurrent of a duplicate element separately.

Also, Index is described as an "ordered set", but that term connotes a set with an order relation on the values of its elements.

OkDownload Version

1.0.5

Problem Describe

判断任务是否在运行的代码：

public synchronized boolean isRunning(DownloadTask task) {
        Util.d(TAG, "isRunning: " + task.getId());
        for (DownloadCall call : runningSyncCalls) {
            if (call.isCanceled()) continue;
            if (call.equalsTask(task)) {
                return true;
            }
        }