install the jupyter notebook extension: enable code folding, toc, and so on

show how to let a column in the data be the tick in the x axis

show how to let a column in the data be the tick in the x axis

an introduction of python decorators

compare apply(apply_async) and map(map_async) in multiprocessing.Pool

compare multiprocessing.Process v.s. threading.Thread

为了自动给blog备份，我把blog放在dropbox里面，这样主机和vmware上的ubuntu_dl机器可以同步，而且dropbox在线还有一份，这样不同意丢了。即使不小心删掉也会有online的备份。

可是一个问题是老是会出现git的error,比 …

an introduction and summary of multiprocessing/threads in python

an introduction of closure in python nested function