Exactly. There are over 23,000 different kinds of trees. There's no way you could get all of them to fit in a library, especially a standard one. Instead, we prefer to provide people with the tools they need to grow their own trees. http://caseytrees.org/programs/planting/ctp/ http://www.ncsu.edu/project/treesofstrength/treefact.htm http://en.wikipedia.org/wiki/Tree On 1/19/2015 3:01 PM, Mark Lawrence wrote: > On 19/01/2015 22:06, Zachary Gilmartin wrote: >> Why aren't there trees in the python standard library? >>>> Probably because you'd never get agreement as to which specific tree > and which specific implementation was the most suitable for inclusion. >