Reading Web Data From Python

8?試題

1.?

Which of the following Python data structures is most similar to the value returned in this line of Python:

x = urllib.urlopen('http://www.py4inf.com/code/romeo.txt')

dictionary

regular expression

file handle

socket

list

2.?

In this Python code, which line actually reads the data?

import socket mysock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) mysock.connect(('www.py4inf.com', 80)) mysock.send('GET http://www.py4inf.com/code/romeo.txt HTTP/1.0\n\n') while True:data = mysock.recv(512)if ( len(data) < 1 ) :breakprint data mysock.close()

mysock.recv()

socket.socket()

mysock.close()

mysock.connect()

mysock.send()

3.?

Which of the following regular expressions would extract the URL from this line of HTML:

<p>Please click <a href="http://www.dr-chuck.com">here</a></p>

href="(.+)"

href=".+"

http://.*

<.*>

4.?

In this Python code, which line is most like the open() call to read a file:

import socket mysock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) mysock.connect(('www.py4inf.com', 80)) mysock.send('GET http://www.py4inf.com/code/romeo.txt HTTP/1.0\n\n') while True:data = mysock.recv(512)if ( len(data) < 1 ) :breakprint data mysock.close()

mysock.connect()

import socket

mysock.recv()

mysock.send()

socket.socket()

5.?

Which HTTP header tells the browser the kind of document that is being returned?

Content-Type:

Document-Type:

HTML-Document:

ETag:

Metadata:

6.?

What should you check before scraping a web site?

That the web site supports the HTTP GET command

That the web site only has links within the same site

That the web site returns HTML for all pages

That the web site allows scraping

7.?

What is the purpose of the BeautifulSoup Python library?

It repairs and parses HTML to make it easier for a program to understand

It animates web operations to make them more attractive

It builds word clouds from web pages

It optimizes files that are retrieved many times

It allows a web site to choose an attractive skin

8.?

What ends up in the "x" variable in the following code:

html = urllib.urlopen(url).read() soup = BeautifulSoup(html) x = soup('a')

A list of all the anchor tags (<a..) in the HTML from the URL

True if there were any anchor tags in the HTML from the URL

All of the externally linked CSS files in the HTML from the URL

All of the paragraphs of the HTML from the URL

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