How to filter tag without an attribute in find_all() function in Beautifulsoup?-CodePudding

Below are a simple html source code I'm working with

<html>
<head>
<title>Welcome to the comments assignment from www.py4e.com</title>
</head>
<body>
<h1>This file contains the actual data for your assignment - good luck!</h1>

<table border="2">
<tr>
<td>Name</td><td>Comments</td>
</tr>
<tr><td>Melodie</td><td><span >100</span></td></tr>
<tr><td>Machaela</td><td><span >100</span></td></tr>
<tr><td>Rhoan</td><td><span >99</span></td></tr>

Below is my code try to get the <td>Melodie</td> line

html='html text file aboved'

soup=BeautifulSoup(html,'html.parser')

    for tag in soup.find_all('td'):
        print(tag) 
        print('----') #Result:
#===============================================================================
# <td>Name</td>
# ----
# <td>Comments</td>
# ----
# <td>Melodie</td>
# ----
# <td><span >100</span></td>
# ----
# <td>Machaela</td>
# ----
# <td><span >100</span></td>
# ----
# <td>Rhoan</td>
# ----
#.........
#===============================================================================

Now I want to get the <td>name<td> lines only and not the line with 'span' and 'class'. I try 2 filters soup.find_all('td' and not 'span') and soup.find_all('td', attrs={'class':None}) but none of those work. I know there is other way around but I want to use the filter in soup.find_all(). My expected output (actually my final goal is to get the name of person between two <td>):

# <td>Name</td>
# ----
# <td>Comments</td>
# ----
# <td>Melodie</td>
# ----
# <td>Machaela</td>
# ----
# <td>Rhoan</td>
# ----

CodePudding user response：

You can get the desired output with two separate selector calls:

from bs4 import BeautifulSoup

html = """
<body>
<table border="2">
<tr>
<td>Name</td><td>Comments</td>
</tr>
<tr><td>Melodie</td><td><span >100</span></td></tr>
<tr><td>Machaela</td><td><span >100</span></td></tr>
<tr><td>Rhoan</td><td><span >99</span></td></tr>
"""
soup = BeautifulSoup(html, "lxml")

for elem in soup.select("td"):
    if not elem.select(".comments"):
        print(elem)

Output:

<td>Name</td>
<td>Comments</td>
<td>Melodie</td>
<td>Machaela</td>
<td>Rhoan</td>

As an aside, prefer lxml to html.parser. It's faster and more robust to malformed HTML.

CodePudding user response：

Select your elements via css selectors e.g. nest pseudo classes :has() and :not():

soup.select('td:not(:has(span))')

soup.select('td:not(:has(.comments))')

Example

from bs4 import BeautifulSoup
html=urllib.request.urlopen('http://py4e-data.dr-chuck.net/comments_1430669.html').read()

soup=BeautifulSoup(html,'html.parser')

for e in soup.select('td:not(:has(span))'):
    print(e)

Output

<td>Name</td>
<td>Comments</td>
<td>Melodie</td>
<td>Machaela</td>
<td>Rhoan</td>
<td>Murrough</td>
<td>Lilygrace</td>
...