[英]python remove specific lines from file
我想删除此HTML文件中的特定行。 我想查看字符串STARTDELETE在哪里,并从那里+1删除到字符串ENDDELETE -1
为了更好的理解,我用“ xxx”标记了要删除的行。 我该如何用python做到这一点?
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Image Gallery</h2>
<div class="row"> <!--STARTDELETE-->
xxx<div class="col-xs-3">
xxx<div class="thumbnail">
xxx<a href="/w3images/lights.jpg" target="_blank">
xxx<img style="padding: 20px" src="xxx" alt="bla" >
xxx<div class="caption">
xxx<p>Test</p>
xxx</div>
xxx</a>
xxx</div>
xxx</div>
</div> <!--ENDDELETE-->
</div>
</body>
</html>
您可以首先将该代码复制并粘贴到输入文件中,该文件可能名为“ input.txt”,然后将要保留的行输出到“ output.txt”。 忽略要删除的行。
w = open("output.txt", "w") # your output goes here
delete = False
with open("input.txt") as file:
for line in file:
if "<!--ENDDELETE-->" in line:
delete = False # stops the deleting
if not delete:
w.write(str(line))
if "<!--STARTDELETE-->" in line:
delete = True # starts the deleting
w.close() # close the output file
希望这可以帮助!
安装beautifulsoup4 (HTML解析器/ DOM操作器)
读取数据,获取一个带有beautifulsoup的“ DOM”(一种可步行的结构),获取您想清空的项目,并删除其子项 。
在您的示例中,您似乎想清空class=row
<div>(s)
,对吗? 假设您的HTML数据存储在名为data.html
的文件中(在您的特定情况下,可能不会像这样...它将是请求的正文或类似内容)
from bs4 import BeautifulSoup
with open('data.html', 'r') as page_f:
soup = BeautifulSoup(page_f.read(), "html.parser")
# In `soup` we have our "DOM tree"
divs_to_empty = soup.find("div", {'class': 'row'})
for child in divs_to_empty.findChildren():
child.decompose()
print(soup.prettify())
输出:
<!DOCTYPE html>
<html lang="en">
<head>
<title>
Bootstrap Example
</title>
<meta charset="utf-8"/>
<meta content="width=device-width, initial-scale=1" name="viewport"/>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js">
</script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js">
</script>
</head>
<body>
<div class="container">
<h2>
Image Gallery
</h2>
<div class="row">
<!--STARTDELETE-->
</div>
<!--ENDDELETE-->
</div>
</body>
</html>
如果您要进行DOM操作,我强烈建议您阅读并玩点漂亮的汤(功能很强大)
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