python - 如何提取之间的文本 python

Question

我通过链接http://www.sanfoundry.com/c-programming-questions-answers-variable-names-1/中的“检查元素”提取了一些div 。在div中有<p>，在<p>中有一些文本被<br<换行/strong>> 我正在尝试提取这些文本，以便可以将其一一放入数组或数据库中。我陷入了提取 <br> 之前和之后的所需文本的困境。

<div class="entry-content" style="visibility: visible; opacity: 1;">
 <div style="text-align:justify">
This section on C interview <span id="IL_AD1" class="IL_AD">questions and answers</span> focuses on “Variable Names”. One shall practice these <span id="IL_AD5" class="IL_AD">interview questions</span> to improve their C programming skills needed for various interviews (campus interviews, walkin interviews, company interviews), placements, entrance exams and other competitive exams. These questions can be attempted by anyone focusing on learning C Programming language. They can be a beginner, fresher, engineering graduate or an experienced IT professional. Our C Interview questions come with detailed explanation of the <span id="IL_AD2" class="IL_AD">answers</span> which helps in better understanding of C <span id="IL_AD3" class="IL_AD">concepts</span>.<p></p>
<p>Here is a listing of C interview questions on “Variable Names” along with answers, explanations and/or solutions:
</p></div>
<p>1. C99 standard guarantees uniqueness of ____ characters for internal names.<br>
a) 31<br>
b) 63<br>
c) 12<br>
d) 14</p>
<span class="collapseomatic" id="id5489" tabindex="0" title="View Answer">View Answer</span><div id="target-id5489" class="collapseomatic_content " style="display: none;">Answer:b<br>
Explanation:ISO C99 compiler may consider only first 63 characters for internal.<br>
</div>
<p>2. C99 standard guarantess uniqueness of _____ characters for external names.<br>
a) 31<br>
b) 6<br>
c) 12<br>
d) 14</p>
<span class="collapseomatic " id="id7970" tabindex="0" title="View Answer">View Answer</span><div id="target-id7970" class="collapseomatic_content " style="display: none;">Answer:a<br>
Explanation:ISO C99 compiler may consider only first 31 characters for external<br>
variables having 31 characters due to which it may not be unique.<br>
</div>
<p>3. Which of the following is not a valid variable name declaration?<br>
a) int __a3;<br>
b) int __3a;<br>
c) int __A3;<br>
d) None of the mentioned</p>
<span class="collapseomatic " id="id5714" tabindex="0" title="View Answer">View Answer</span><div id="target-id5714" class="collapseomatic_content " style="display: none;">Answer:d<br>
Explanation:None.<br>
</div>
<p>4. Which of the following is not a valid variable name declaration?<br>
a) int _a3;<br>
b) int a_3;<br>
c) int 3_a;<br>
d) int _3a</p>

那么shell我如何分别得到“C99标准保证内部____字符的唯一性”，“31”，“63”，“12”，“14”，“C99标准保证外部_____字符的唯一性”和“31”，“6”，“12”，“14”等等......

除此之外，我也不需要项目符号编号和字母顺序

代码:

from bs4 import BeautifulSoup
soup = BeautifulSoup(htmls, 'html.parser')
h4s = soup.find_all('p')
for h4 in h4s:
    for text in h4.find_next_siblings('br'):
        print(text.strip())

知道我哪里错了吗？

Answer 1

在这种情况下，您可以尝试 CSS Selector - soup.select('div.entry-content p') 将选择一个带有 class 的 div(参见 .) 名称 entry-content 以及该 div 内的所有 p。我假设只有一个 div 具有该类名称。

from bs4 import BeautifulSoup as bs

html = """<div class="entry-content" style="visibility: visible; opacity: 1;">
 <div style="text-align:justify">
This section on C interview <span id="IL_AD1" class="IL_AD">questions and answers</span> focuses on “Variable Names”. One shall practice these <span id="IL_AD5" class="IL_AD">interview questions</span> to improve their C programming skills needed for various interviews (campus interviews, walkin interviews, company interviews), placements, entrance exams and other competitive exams. These questions can be attempted by anyone focusing on learning C Programming language. They can be a beginner, fresher, engineering graduate or an experienced IT professional. Our C Interview questions come with detailed explanation of the <span id="IL_AD2" class="IL_AD">answers</span> which helps in better understanding of C <span id="IL_AD3" class="IL_AD">concepts</span>.<p></p>
<p>Here is a listing of C interview questions on “Variable Names” along with answers, explanations and/or solutions:
</p></div>
<p>1. C99 standard guarantees uniqueness of ____ characters for internal names.<br>
a) 31<br>
b) 63<br>
c) 12<br>
d) 14</p>
<span class="collapseomatic" id="id5489" tabindex="0" title="View Answer">View Answer</span><div id="target-id5489" class="collapseomatic_content " style="display: none;">Answer:b<br>
Explanation:ISO C99 compiler may consider only first 63 characters for internal.<br>
</div>
<p>2. C99 standard guarantess uniqueness of _____ characters for external names.<br>
a) 31<br>
b) 6<br>
c) 12<br>
d) 14</p>
<span class="collapseomatic " id="id7970" tabindex="0" title="View Answer">View Answer</span><div id="target-id7970" class="collapseomatic_content " style="display: none;">Answer:a<br>
Explanation:ISO C99 compiler may consider only first 31 characters for external<br>
variables having 31 characters due to which it may not be unique.<br>
</div>
<p>3. Which of the following is not a valid variable name declaration?<br>
a) int __a3;<br>
b) int __3a;<br>
c) int __A3;<br>
d) None of the mentioned</p>
<span class="collapseomatic " id="id5714" tabindex="0" title="View Answer">View Answer</span><div id="target-id5714" class="collapseomatic_content " style="display: none;">Answer:d<br>
Explanation:None.<br>
</div>
<p>4. Which of the following is not a valid variable name declaration?<br>
a) int _a3;<br>
b) int a_3;<br>
c) int 3_a;<br>
d) int _3a</p>"""

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

p = soup.select('div.entry-content p')
for i in p[2:]:
    print i.text.encode('utf-8')
    print '\n'*3 # just print three newlines

输出-

1. C99 standard guarantees uniqueness of ____ characters for internal names.
a) 31
b) 63
c) 12
d) 14




2. C99 standard guarantess uniqueness of _____ characters for external names.
a) 31
b) 6
c) 12
d) 14




3. Which of the following is not a valid variable name declaration?
a) int __a3;
b) int __3a;
c) int __A3;
d) None of the mentioned




4. Which of the following is not a valid variable name declaration?
a) int _a3;
b) int a_3;
c) int 3_a;
d) int _3a