我有以下代表树的节点的类：
class Node:
def __init__(self, name, parent=None):
self.name = name
self.parent = parent
self.children = []
# ...
if parent:
self.parent.children.append(self)
如何打印这样的树？
这是我的解决方案：
def print_tree(current_node, indent="", last='updown'):
nb_children = lambda node: sum(nb_children(child) for child in node.children) + 1
size_branch = {child: nb_children(child) for child in current_node.children}
""" Creation of balanced lists for "up" branch and "down" branch. """
up = sorted(current_node.children, key=lambda node: nb_children(node))
down = []
while up and sum(size_branch[node] for node in down) < sum(size_branch[node] for node in up):
down.append(up.pop())
""" Printing of "up" branch. """
for child in up:
next_last = 'up' if up.index(child) is 0 else ''
next_indent = '{0}{1}{2}'.format(indent, ' ' if 'up' in last else '│', " " * len(current_node.name))
print_tree(child, indent=next_indent, last=next_last)
""" Printing of current node. """
if last == 'up': start_shape = '┌'
elif last == 'down': start_shape = '└'
elif last == 'updown': start_shape = ' '
else: start_shape = '├'
if up: end_shape = '┤'
elif down: end_shape = '┐'
else: end_shape = ''
print '{0}{1}{2}{3}'.format(indent, start_shape, current_node.name, end_shape)
""" Printing of "down" branch. """
for child in down:
next_last = 'down' if down.index(child) is len(down) - 1 else ''
next_indent = '{0}{1}{2}'.format(indent, ' ' if 'down' in last else '│', " " * len(current_node.name))
print_tree(child, indent=next_indent, last=next_last)
使用示例：
shame = Node("shame")
conscience = Node("conscience", shame)
selfdisgust = Node("selfdisgust", shame)
embarrassment = Node("embarrassment", shame)
selfconsciousness = Node("selfconsciousness", embarrassment)
shamefacedness = Node("shamefacedness", embarrassment)
chagrin = Node("chagrin", embarrassment)
discomfiture = Node("discomfiture", embarrassment)
abashment = Node("abashment", embarrassment)
confusion = Node("confusion", embarrassment)
print_tree(shame)
这是输出：
┌conscience
├self-disgust
shame┤
│ ┌self-consciousness
│ ├shamefacedness
│ ├chagrin
└embarrassment┤
├discomfiture
├abashment
└confusion
更新：
我在PyPi上推出了更完整的解决方案。
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