import nltk
#defining Contex Free Grammar
grammar = nltk.CFG.fromstring("""
S -> NP VP
NP -> Det Nom | PropN
Nom -> Adj Nom | N
VP -> V Adj | V NP | V S | V NP PP
PP -> P NP
PropN -> 'Buster' | 'Chatterer' | 'Joe'
Det -> 'the' | 'a'
N -> 'bear' | 'squirrel' | 'tree' | 'fish' | 'log'
Adj -> 'angry' | 'frightened' | 'little' | 'tall'
V -> 'chased' | 'saw' | 'said' | 'thought' | 'was' | 'put'
P -> 'on'
""")
sentence = 'the angry bear chased the frightened little squirrel'.split()
def parse(sent):
#Returns nltk.Tree.Tree format output
a = []
parser = nltk.ChartParser(grammar)
for tree in parser.parse(sent):
a.append(tree)
return(a[0])
#Gives output as structured tree
print(parse(sentence))
#Gives tree diagrem in tkinter window
parse(sentence).draw()
结构化树输出
Tkinter 窗口中的树图
If you have a well-written context-free grammar(CFG) then you can draw the tree diagram simply by using nltk library.
import nltk
#defining Contex Free Grammar
grammar = nltk.CFG.fromstring("""
S -> NP VP
NP -> Det Nom | PropN
Nom -> Adj Nom | N
VP -> V Adj | V NP | V S | V NP PP
PP -> P NP
PropN -> 'Buster' | 'Chatterer' | 'Joe'
Det -> 'the' | 'a'
N -> 'bear' | 'squirrel' | 'tree' | 'fish' | 'log'
Adj -> 'angry' | 'frightened' | 'little' | 'tall'
V -> 'chased' | 'saw' | 'said' | 'thought' | 'was' | 'put'
P -> 'on'
""")
sentence = 'the angry bear chased the frightened little squirrel'.split()
def parse(sent):
#Returns nltk.Tree.Tree format output
a = []
parser = nltk.ChartParser(grammar)
for tree in parser.parse(sent):
a.append(tree)
return(a[0])
#Gives output as structured tree
print(parse(sentence))
#Gives tree diagrem in tkinter window
parse(sentence).draw()
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评论（3）
您可以使用http://ironcreek.net/phpsyntaxtree/。
示例：
输入为：
如果字符串没有换行符也有效，例如：
You can use http://ironcreek.net/phpsyntaxtree/.
Example:
Input was:
Also works if the string has no line breaks, e.g.:
如果您有编写良好的上下文无关语法（CFG），那么您可以简单地使用 nltk 库来绘制树形图。
结构化树输出
Tkinter 窗口中的树图
If you have a well-written context-free grammar(CFG) then you can draw the tree diagram simply by using nltk library.
Structured tree output
Tree Diagram in Tkinter Window
http://brenocon.com/parseviz/：
输入：
输出：
http://brenocon.com/parseviz/:
Input:
Output: