python - 插入带有文件特定值的换行符

Question

我想在具有特定值的文件中搜索并给出换行符并写入现有文件和单独的文件

源代码

input_file= "test.txt"
putput_file="result.txt"
def search_break(input_file):
    with open(input_file) as f:
        lines = f.readlines()
        print lines
        for i in range(len(lines)):
            if i == "Foo":
                print
        print lines[i]
            if i== "50.000"
                print
        print lines[i]

            f.close()



print search_break(input_file)

输入文件-test.txt

50.000
0.6016
1.0000
Foo
0.7318
1.0000

输出文件-test.txt

50.000
0.6016
1.0000

Foo
0.7318
1.0000

输出文件-result.txt

50.000
0.6016
1.0000

Foo
0.7318
1.0000

任何建议将不胜感激。谢谢。

Answer 1

readlines 保留换行符，因此您需要在测试之前将其删除，否则它永远不会匹配。我还将所有搜索词合并为一组，并简化了循环:

with open(input_file) as f:
    for line in f:
        if line.strip().lower() in {"foo", "50.000"}:  # added .lower() and changed match strings to lowercase
            print
        print line,   # added comma to prevent the automatic newline

使用多个 if..else 语句:

with open(input_file) as f:
    for line in f:
        if line.strip() == "Foo":
            print
        elif line.strip() == "50.000":
            print
        print line,   # added comma to prevent the automatic newline