如何禁止pyparsing中文字之間的空格？

Question

grammar = Literal("from") + Literal(":") + Word(alphas) 

語法需要拒絕from : mary並且只接受from:mary即沒有任何交織空間。我如何在pyparsing中執行此操作？謝謝

Answer 1

你能用Combine嗎？

grammar = Combine(Literal("from") + Literal(":") + Word(alphas)) 

那麼接下來：

編輯響應您的評論。

真的嗎？

>>> grammar = pyparsing.Combine(Literal("from") + Literal(":") + Word(pyparsing.alphas)) 
>>> grammar.parseString('from : mary') 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
    File "/usr/lib/pymodules/python2.6/pyparsing.py", line 1076, in parseString 
    raise exc 
pyparsing.ParseException: Expected ":" (at char 4), (line:1, col:5) 
>>> grammar.parseString('from:mary') 
(['from:mary'], {})