Python程序库：Veusz 1.9 发布

Veusz 是一个用来绘制各种科学图表的Python程序库，可导出为 Postscript 和 PDF 文档。包含一个易用的图形化界面，同时也有一些命令行接口以便直接在 Python 程序中调用。

Changes:
1. A plugin interface was included for creating datasets from other datasets inside the program.
2. It comes with a variety of useful operations (e.g. add datasets, compute means)....
3. Plugins include color randomization and widget cloning for datasets.
4. A vector field widget was added.
5. A new object interface allows the documents tree of widgets to be manipulated.
6. It is now possible to specify ranges of data for fitting.
7. There are several minor user interface improvements and bugfixes

补充：Web开发 , Python ,