>>> print(soup.p.prettify)
<bound method Tag.prettify of <p class="title"><b>The demo python introduces several python courses.</b></p>>
>>> print(soup.p.prettify())
<p class="title">
<b>
The demo python introduces several python courses.
</b>
</p>
>>> print(soup.html.prettify())
<html>
<head>
<title>
This is a python demo page
</title>
</head>
<body>
<p class="title">
<b>
The demo python introduces several python courses.
</b>
</p>
<p class="course">
Python is a wonderful general-purpose programming language. You can learn Python from novice to professional by tracking the following courses:
<a class="py1" href="http://www.icourse163.org/course/BIT-268001" id="link1">
Basic Python
</a>
and
<a class="py2" href="http://www.icourse163.org/course/BIT-1001870001" id="link2">
Advanced Python
</a>
.
</p>
</body>
</html>
>>> print(soup.head.prettify())
<head>
<title>
This is a python demo page
</title>
</head>
>>>工作原理，在原来的文本里加入了换行符：“\n”。就可以进行换行，使得程序一目了然！
图片比例不对，就用放大镜查看！
