python - 如何将特定句子与下一个句子一起删除？

Question

我正在处理文本文件中的文字记录，我需要删除一些特定的行。

这是一个例子:

Child:    Mom   can   I    have  an  ice cream?
grammar:  noun  verb  pro  verb  art noun
Mom:      Here is   some  money, go    buy   that  ice cream
grammar:  adv  verb pro   noun   verb  verb  pro   noun
Child:    But  I   want more money, I   want the  big  ice cream
grammar:  conj pro verb adj  noun   pro verb art  adj  noun

如果我想删除所有妈妈的句子和后面的语法句子，而我想保留 child 的语法句子，我可以使用什么Python脚本？

Answer 1

它惰性地成对地从文件中读取，并在特定条件下跳过生成值。下面的代码函数将过滤的行转储到另一个文件。

def yield_filtered_lines(filename):
    with open(filename) as f:
        while True:
            sentence = f.readline()
            grammar = f.readline()
            if not sentence or not grammar:
                break  # EOF
            if sentence.startswith("Mom:"):
                continue
            yield sentence
            yield grammar

with open('filtered.txt', 'w') as f:
    for l in yield_filtered_lines("sentences.txt"):
        f.write(l)

sentences.txt内容:

Child:    Mom   can   I    have  an  ice cream?
grammar:  noun  verb  pro  verb  art noun
Mom:      Here is   some  money, go    buy   that  ice cream
grammar:  adv  verb pro   noun   verb  verb  pro   noun
Child:    But  I   want more money, I   want the  big  ice cream
grammar:  conj pro verb adj  noun   pro verb art  adj  noun

filtered.txt内容:

Child:    Mom   can   I    have  an  ice cream?
grammar:  noun  verb  pro  verb  art noun
Child:    But  I   want more money, I   want the  big  ice cream
grammar:  conj pro verb adj  noun   pro verb art  adj  noun