Reading Web Data From Python >> Using Python to Access Web Data

Reading Web Data From Python >> Using Python to Access Web Data

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

x = urllib.request.urlopen('http://data.pr4e.org/romeo.txt')

• socket
• dictionary
• regular expression
• list
• file handle

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

import socket
 mysock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 mysock.connect(('data.pr4e.org', 80))
 cmd = 'GET http://data.pr4e.org/romeo.txt HTTP/1.0\n\n'.encode()
 mysock.send(cmd)
 while True:
     data = mysock.recv(512)
     if (len(data) < 1):
         break
     print(data.decode())
 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(('data.pr4e.org', 80))
 cmd = 'GET http://data.pr4e.org/romeo.txt HTTP/1.0\n\n'.encode()
 mysock.send(cmd)
 while True:
     data = mysock.recv(512)
     if (len(data) < 1):
         break
     print(data.decode())
 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?

• ETag:
• HTML-Document:
• Metadata:
• Document-Type:
• Content-Type:

6. What should you check before scraping a web site?

• That the web site supports the HTTP GET command
• That the web site returns HTML for all pages
• That the web site allows scraping
• That the web site only has links within the same site

7. What is the purpose of the BeautifulSoup Python library?

• It builds word clouds from web pages
• It repairs and parses HTML to make it easier for a program to understand
• It optimizes files that are retrieved many times
• It allows a web site to choose an attractive skin
• It animates web operations to make them more attractive

8. What ends up in the “x” variable in the following code:

html = urllib.request.urlopen(url).read()
 soup = BeautifulSoup(html, 'html.parser')
 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

9. What is the most common Unicode encoding when moving data between systems?

• UTF-64
• UTF-128
• UTF-16
• UTF-8
• UTF-32

10. What is the decimal (Base-10) numeric value for the upper case letter “G” in the ASCII character set?

• 71
• 7
• 103
• 25073
• 14

11. What word does the following sequence of numbers represent in ASCII:
108, 105, 110, 101

• tree
• func
• line
• lost
• ping

12. How are strings stored internally in Python 3?

• EBCDIC
• Unicode
• UTF-8
• ASCII
• Byte Code

13. When reading data across the network (i.e. from a URL) in Python 3, what method must be used to convert it to the internal format used by strings?

• encode()
• upper()
• trim()
• find()
• decode()