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

add tabs(QTabWidget) to print the data and the models.

from the previous file, now to use widgets and structure the code.