如何从文件中删除特定字符串? [英] How to delete specific strings from a file?

问题描述

我有一个数据文件(非结构化、凌乱的文件)，我必须从中清理特定的字符串列表(删除字符串).

I have a data file (unstructured, messy file) from which I have to scrub specific list of strings (delete strings).

这是我正在做但没有结果的事情:

Here is what I am doing but with no result:

infile = r"messy_data_file.txt"
outfile = r"cleaned_file.txt"

delete_list = ["firstname1 lastname1","firstname2 lastname2"....,"firstnamen lastnamen"]
fin=open(infile,"")
fout = open(outfile,"w+")
for line in fin:
    for word in delete_list:
        line = line.replace(word, "")
    fout.write(line)
fin.close()
fout.close()

当我执行文件时，出现以下错误:

When I execute the file, I get the following error:

NameError: name 'word' is not defined

推荐答案

readlines 方法返回 行 的列表，而不是单词，因此您的代码仅在您的一个单词单独位于一行时才有效.

The readlines method returns a list of lines, not words, so your code would only work where one of your words is on a line by itself.

由于文件是迭代器，因此可以更容易完成:

Since files are iterators over lines this can be done much easier:

infile = "messy_data_file.txt"
outfile = "cleaned_file.txt"

delete_list = ["word_1", "word_2", "word_n"]
with open(infile) as fin, open(outfile, "w+") as fout:
    for line in fin:
        for word in delete_list:
            line = line.replace(word, "")
        fout.write(line)

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