如果findall找到了一个搜索模式，请在文件中插入新行

Question

我想在findall找到一个搜索模式后，给文件添加一个新行。我使用的代码只将输入文件的内容写入输出文件。它不会向输出文件添加新行。如何修复代码？你知道吗

import re
text = """
Hi! How are you?
Can you hear me?
"""
with open("input.txt", "r") as infile:
    readcontent = infile.readlines()

with open("output.txt", "w") as out_file:
    for line in readcontent:
    x1 = re.findall(text, line)
    if line == x1:
        line = line + text
    out_file.write(line)

你知道吗输入.txt地址：

ricochet robots
settlers of catan
acquire
Hi! How are you?
Can you hear me?
this is very valuable
finish

想要的输出.txt地址：

ricochet robots
settlers of catan
acquire
Hi! How are you?
Can you hear me?

Added new line

this is very valuable
finish

Answer 1

尝试迭代每一行，检查文本是否存在。你知道吗

例如：

res = []
with open(filename, "r") as infile:
    for line in infile:
        if line.strip() == "Hi! How are you?":
            res.append(line.strip())
            lineVal = (next(infile)).strip() 
            if lineVal == "Can you hear me?":
                res.append(lineVal)
                res.append("\n Added new line \n")
        else:
            res.append(line.strip())



with open(filename1, "w") as out_file:
    for line in res:
        out_file.write(line+"\n")

输出：

ricochet robots
settlers of catan
acquire
Hi! How are you?
Can you hear me?

 Added new line 

this is very valuable
finish

Answer 2

在这里不要使用regex。检查当前行，如果是要检查的行，则添加新行。你知道吗

with open("output.txt", "w") as out_file:
    for line in readcontent:
        out_file.write(line)
        if line.strip() == 'Can you hear me?':
            out_file.write('\n')

如果您需要一个regex本身，请选择以下内容（尽管我从不推荐）：

with open("output.txt", "w") as out_file:
    for line in readcontent:
        out_file.write(line)
        if re.match('Can you hear me?', line.strip()):
            out_file.write('\n')

Answer 3

这就是你想要的：

text = "Can you hear me?"
with open("input.txt", "r") as infile:
    readcontent = infile.readlines()

with open("output.txt", "w") as out_file:
    for idx,line in enumerate(readcontent):
       if line.rstrip() == text:
           line+='\nAdded new line\n\n'
       out_file.write(line)

output.txt看起来像：

ricochet robots
settlers of catan
acquire
Hi! How are you?
Can you hear me?

Added new line

this is very valuable
finish