week 4 quiz

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')
Ans: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()
Ans:mysock.recv()

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>
Ans: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()
Ans:mysock.connect( )

5.Which HTTP header tells the browser the kind of document that is being returned?
Ans:Content-Type:

6.What should you check before scraping a web site?
Ans:That the web site allows scraping not That the web site returns HTML for all pages

7.What is the purpose of the BeautifulSoup Python library?
Ans:It repairs and parses HTML to make it easier for a program to understand

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

9.What is the most common Unicode encoding when moving data between systems?
Ans:UTF-8 

10.What is the ASCII character that is associated with the decimal value 42?
Ans:*