python - pyPEG 中的替换函数

Question

如何替换 pyPEG 中的某些单词？例如我有句子

约翰踢足球

我想将John替换为Bob并将其组合为：

鲍勃踢足球。

from pypeg2 import *

class Try(str):

    grammar = 'John ', restline

    # I am think that here should be same callback function, but i have no idea how to type it

f = parse("John plays football", Try)

print(compose(f))

输出：

John plays football

Answer 1

“John”是第一个被替换的参数，“Bob”是替换字符串。

使用.replace(something, with_something_else).

from pypeg2 import *

def Try(String):

    grammar = 'John'
    String = String.replace(grammar, 'Bob')
    return String

f = Try("John plays football")

print(f)

输出：

"Bob plays football"