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+---
+template: oldpost
+title: jst
+date: 2015-04-02
+comments: true
+archive: false
+---
+jst = juggling skill tree
+
+If you have ever played a computer role playing game, you may have
+noticed the protagonist sometimes has a skill "tree" (most of the time
+it is actually a directed acyclic graph), where certain skills leads to
+others. For example,
+[here](http://hydra-media.cursecdn.com/diablo.gamepedia.com/3/37/Sorceress_Skill_Trees_%28Diablo_II%29.png?version=b74b3d4097ef7ad4e26ebee0dcf33d01)
+is the skill tree of sorceress in [Diablo
+II](https://en.wikipedia.org/wiki/Diablo_II).
+
+Now suppose our hero embarks on a quest for learning all the possible
+juggling patterns. Everyone would agree she should start with cascade,
+the simplest nontrivial 3-ball pattern, but what afterwards? A few other
+accessible patterns for beginners are juggler's tennis, two in one and
+even reverse cascade, but what to learn after that? The encyclopeadic
+[Library of Juggling](http://libraryofjuggling.com/) serves as a good
+guide, as it records more than 160 patterns, some of which very
+aesthetically appealing. On this website almost all the patterns have a
+"prerequisite" section, indicating what one should learn beforehand. I
+have therefore written a script using [Python](http://python.org),
+[BeautifulSoup](http://www.crummy.com/software/BeautifulSoup/) and
+[pygraphviz](http://pygraphviz.github.io/) to generate a jst (graded by
+difficulties, which is the leftmost column) from the Library of Juggling
+(click the image for the full size): 
+
+[![The juggling skill tree](../assets/resources/juggling.png){width="38em"}](../assets/resources/juggling.png)