Question

Python初学者在这里。我正在尝试在.conf文件中搜索特定标签，然后在子标签中插入新值：

<Dad bob>
        <Child>
                Child mike
                Child ivan
                Child george
        </Child>
</Dad>

<Dad frank>
        <Child>
                Child carlos
        </Child>
</Dad>

说我想为 Bob 插入一个新的 Child 。仅在找到</Child>后，我的代码才应将Child newchild + "\n" + </Child>替换为<Dad bob>，然后停止。当我运行代码时，鲍勃和弗兰克都被添加了一个孩子。

不幸的是，这是我到目前为止所拥有的。

with fileinput.FileInput(CONF_FILE, inplace=True, backup='.bak') as file:
    for line in file:
        print(line.replace('</Child>', '\t\t' + newchild + '\n\t</Child>'), end='')

我不知道怎么只用鲍勃代替。非常感谢您的帮助。干杯！

Answer 1

尝试一下：

from bs4 import BeautifulSoup
import re

with open("test.conf", "r") as f:
    x = f.read()

soup = BeautifulSoup(x, 'lxml')
bobschild = soup.dad.child

for child in bobschild:
    child.replace_with("Child newchild")


s = soup.prettify()
s = str(s)

s = s.replace("<html>","")
s = s.replace("<body>","")
s = s.replace("</body>","")
s = s.replace("</html>","")

t = ""
for line in s.split("\n"):
    l = line[2:] + "\n"
    if re.match(r'^\s*$', l):
        continue
    t += l

print(t)

with open("test.conf", "w") as f:
    f.write(t)

这不是完美的，这是输出：

<dad bob="">
 <child>
  Child newchild
 </child>
</dad>
<dad frank="">
 <child>
  Child carlos
 </child>
</dad>

Answer 2

感谢您的答复！虽然不太漂亮，但我最终还是使用linux sed命令在行tagOpen和tagClose之间进行替换：

MY_FILE = 'file.conf'
LOOKUP = '<Dad bob>'
LOOKUP_CLOSE = '</Dad>'
LOOKUP_CHILD_CLOSE = '</Child>'
CHILD_NAME = 'tony'

tagOpen = 0
tagClose = 0
stop = False

with open(MY_FILE) as myFile:
    for num, line in enumerate(myFile, 1):
        if LOOKUP in line:
            tagOpen = num
            stop = True
        if LOOKUP_CLOSE in line and stop == True:
            tagClose = num
            break

if tagOpen != 0 or tagClose != 0:
    os.system("sed -i \'%s,%ss/%s/\\tChild  %s\\n\\t%s/\' %s" % (str(tagOpen), str(tagClose), LOOKUP_CHILD_CLOSE, CHILD_NAME, LOOKUP_CHILD_CLOSE, MY_FILE))

如何搜索和替换在特定文本行之后找到的文本行

2 个答案: