Question

我正在处理文本文件中的成绩单，我需要摆脱一些特定的行。

以下是一个例子：

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下面的语法句子，我想要保留孩子的语法句子，我可以使用哪些Python脚本？

Answer 1

它从文件中懒惰地成对读取，并跳过在特定条件下产生的值。下面的代码将过滤后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

Answer 2

执行以下操作：

使用 for循环
对于文件中的每一行，测试它的开头，例如。 line.startswith（ “儿童：”）
如果为True，则将该行写入新文件（在启动 for loop 之前打开）

只需将上面的内容翻译成python代码，就可以了。

Answer 3

function SomeClass () {}
SomeClass.prototype.someVar = null;
SomeClass.prototype.someFunc = function () {}

Answer 4

您可以使用namedTemporaryFile和shutil.move替换原始文件：

from tempfile import NamedTemporaryFile
from shutil import move

with open('in.txt') as f, NamedTemporaryFile(dir=".", delete=False) as out:
    for line in f:
        if line.startswith("Child"):
            out.writelines((line,next(f)))

move(out.name, "temp.txt")

如何删除下一个特定句子？

4 个答案: