Dendropy leaf_iter（）lambda函數的錯誤

Question

我在Dendropy中做了一些系統發育： 我試着按照教程，使用過濾器（lambda函數）遍歷樹的所有葉子。

如果迭代器是leaf_iter，那麼使用lambda函數會給出錯誤，但如果迭代器是其他任何其他（例如postorder_node_iterate），則不會產生錯誤。我錯過了什麼？

回溯是幾百線長，所以我只是告訴你一個摘錄：

Traceback (most recent call last): 
    File "<pyshell#274>", line 1, in <module> 
    for node in tree_test.leaf_iter(survival): 
    File "build\bdist.win32\egg\dendropy\dataobject\tree.py", line 915, in leaf_iter 
    for node in self.seed_node.leaf_iter(filter_fn=filter_fn): 
    File "build\bdist.win32\egg\dendropy\dataobject\tree.py", line 2444, in leaf_iter 
    for node in self.postorder_iter(filter_fn): 
    File "build\bdist.win32\egg\dendropy\dataobject\tree.py", line 2427, in postorder_iter 
    if filter_fn is None or filter_fn(node): 
    File "build\bdist.win32\egg\dendropy\dataobject\tree.py", line 2441, in <lambda> 
    filter_fn = lambda x: x.is_leaf() and filter_fn(x) or None 

[... line 2441 ...] 

    File "build\bdist.win32\egg\dendropy\dataobject\tree.py", line 2441, in <lambda> 
    filter_fn = lambda x: x.is_leaf() and filter_fn(x) or None 
    File "build\bdist.win32\egg\dendropy\dataobject\tree.py", line 2537, in is_leaf 
    return bool(not self._child_nodes) 
RuntimeError: maximum recursion depth exceeded while calling a Python object 

要測試你可以使用下面的代碼的問題，幾乎從教程採取：

#call a bit of modules and build a simulated tree 
import dendropy 
import random 
from dendropy import TaxonSet, Tree, TreeList, treesim 
taxa = dendropy.TaxonSet(['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']) 
tree_test = treesim.birth_death(0.4, 0.1, ntax=8, taxon_set=taxa, repeat_until_success=True) 

#define an evolutionary character 
def evolve_char(tree, start=1.0): 
    for node in tree.preorder_node_iter(): 
     if node.parent_node is None: 
      node.value = 1.0 
     else: 
      node.value = random.gauss(node.parent_node.value, node.edge.length) 
    return tree 
#evolve the character on the simulated tree 
evolve_char(tree_test) 

#positive_char select the nodes with positive character 
positive_char = lambda node: True if node.value > 0. else False 

#iter with postorder_node_iter (no problem) 
for node in tree_test.postorder_node_iter(): 
    print("Node %s with value %s" % (node.taxon, node.value)) 
for node in tree_test.leaf_iter(positive_char): 
    print("Node %s with value %s" % (node.taxon, node.value)) 

#iter with leaf_iter without filtering (no problem) 
for node in tree_test.leaf_iter(): 
    print("Node %s with value %s" % (node.taxon, node.value)) 

#iter with leaf_iter and filtering (problem!) 
for node in tree_test.leaf_iter(positive_char): 
    print("Node %s with value %s" % (node.taxon, node.value)) 

Answer 1

好吧，那是一個錯誤。剛剛修復在新的github發佈。

我會離開這裏，因爲別人可能會發現相同的問題。