adding 11,12,13.2

Assignments/Assignment_11.py

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+Finding Numbers in a Haystack
+In this assignment you will read through and parse a file with text and numbers. You will extract all the numbers in the file and compute the sum of the numbers.
+Data Files
+We provide two files for this assignment. One is a sample file where we give you the sum for your testing and the other is the actual data you need to process for the assignment.
+Sample data: http://python-data.dr-chuck.net/regex_sum_42.txt (There are 87 values with a sum=445822)
+Actual data: http://python-data.dr-chuck.net/regex_sum_242232.txt (There are 101 values and the sum ends with 786)
+
+These links open in a new window. Make sure to save the file into the same folder as you will be writing your Python program. Note: Each student will have a distinct data file for the assignment - so only use your own data file for analysis.
+Data Format
+The file contains much of the text from the introduction of the textbook except that random numbers are inserted throughout the text. Here is a sample of the output you might see:
+Why should you learn to write programs? 7746
+12 1929 8827
+Writing programs (or programming) is a very creative 
+7 and rewarding activity.  You can write programs for 
+many reasons, ranging from making your living to solving
+8837 a difficult data analysis problem to having fun to helping 128
+someone else solve a problem.  This book assumes that 
+everyone needs to know how to program ...
+
+
+The sum for the sample text above is 27486. The numbers can appear anywhere in the line. There can be any number of numbers in each line (including none).
+Handling The Data
+The basic outline of this problem is to read the file, look for integers using the re.findall(), looking for a regular expression of '[0-9]+' and then converting the extracted strings to integers and summing up the integers.
+Turn in Assignent
+Enter the sum from the actual data and your Python code below:
+Sum:  (ends with 786) 
+Python code:
+
+Optional: Just for Fun
+There are a number of different ways to approach this problem. While we don't recommend trying to write the most compact code possible, it can sometimes be a fun exercise. Here is a a redacted version of two-line version of this program using list comprehension:
+import re
+print sum( [ ****** *** * in **********('[0-9]+',**************************.read()) ] )
+
+

Assignments/Assignment_12.py

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+'''Exploring the HyperText Transport Protocol
+You are to retrieve the following document using the HTTP protocol in a way that you can examine the HTTP Response headers.
+http://www.pythonlearn.com/code/intro-short.txt
+There are three ways that you might retrieve this web page and look at the response headers:
+Preferred: Modify the socket1.py program to retrieve the above URL and print out the headers and data.
+Open the URL in a web browser with a developer console or FireBug and manually examine the headers that are returned.
+Use the telnet program as shown in lecture to retrieve the headers and content.
+Enter the header values in each of the fields below and press "Submit".
+Last-Modified:
+
+ETag:
+
+Content-Length:
+
+Cache-Control:
+
+Content-Type:
+'''

Assignments/Assignment_13.1

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+Scraping Numbers from HTML using BeautifulSoup In this assignment you will write a Python program similar to http://www.pythonlearn.com/code/urllink2.py. The program will use urllib to read the HTML from the data files below, and parse the data, extracting numbers and compute the sum of the numbers in the file.
+We provide two files for this assignment. One is a sample file where we give you the sum for your testing and the other is the actual data you need to process for the assignment.
+Sample data: http://python-data.dr-chuck.net/comments_42.html (Sum=2553)
+Actual data: http://python-data.dr-chuck.net/comments_242237.html (Sum ends with 67)
+
+You do not need to save these files to your folder since your program will read the data directly from the URL. Note: Each student will have a distinct data url for the assignment - so only use your own data url for analysis.
+Data Format
+The file is a table of names and comment counts. You can ignore most of the data in the file except for lines like the following:
+<tr><td>Modu</td><td><span class="comments">90</span></td></tr>
+<tr><td>Kenzie</td><td><span class="comments">88</span></td></tr>
+<tr><td>Hubert</td><td><span class="comments">87</span></td></tr>
+
+
+You are to find all the <span> tags in the file and pull out the numbers from the tag and sum the numbers.
+Look at the sample code provided. It shows how to find all of a certain kind of tag, loop through the tags and extract the various aspects of the tags.
+...
+# Retrieve all of the anchor tags
+tags = soup('a')
+for tag in tags:
+   # Look at the parts of a tag
+   print 'TAG:',tag
+   print 'URL:',tag.get('href', None)
+   print 'Contents:',tag.contents[0]
+   print 'Attrs:',tag.attrs
+
+
+You need to adjust this code to look for span tags and pull out the text content of the span tag, convert them to integers and add them up to complete the assignment.
+Sample Execution
+$ python solution.py 
+Enter - http://python-data.dr-chuck.net/comments_42.html
+Count 50
+Sum 2482
+
+
+Turning in the Assignment
+Enter the sum from the actual data and your Python code below:
+Sum:  (ends with 67) 

Assignments/Assignment_13.2

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+Following Links in Python
+In this assignment you will write a Python program that expands on http://www.pythonlearn.com/code/urllinks.py. The program will use urllib to read the HTML from the data files below, extract the href= vaues from the anchor tags, scan for a tag that is in a particular position relative to the first name in the list, follow that link and repeat the process a number of times and report the last name you find.
+We provide two files for this assignment. One is a sample file where we give you the name for your testing and the other is the actual data you need to process for the assignment
+Sample problem: Start at http://python-data.dr-chuck.net/known_by_Fikret.html 
+Find the link at position 3 (the first name is 1). Follow that link. Repeat this process 4 times. The answer is the last name that you retrieve.
+Sequence of names: Fikret Montgomery Mhairade Butchi Anayah 
+Last name in sequence: Anayah
+
+Actual problem: Start at: http://python-data.dr-chuck.net/known_by_Ross.html 
+Find the link at position 18 (the first name is 1). Follow that link. Repeat this process 7 times. The answer is the last name that you retrieve.
+Hint: The first character of the name of the last page that you will load is: S
+
+Strategy
+The web pages tweak the height between the links and hide the page after a few seconds to make it difficult for you to do the assignment without writing a Python program. But frankly with a little effort and patience you can overcome these attempts to make it a little harder to complete the assignment without writing a Python program. But that is not the point. The point is to write a clever Python program to solve the program.
+Sample execution
+Here is a sample execution of a solution:
+$ python solution.py 
+Enter URL: http://python-data.dr-chuck.net/known_by_Fikret.html
+Enter count: 4
+Enter position: 3
+Retrieving: http://python-data.dr-chuck.net/known_by_Fikret.html
+Retrieving: http://python-data.dr-chuck.net/known_by_Montgomery.html
+Retrieving: http://python-data.dr-chuck.net/known_by_Mhairade.html
+Retrieving: http://python-data.dr-chuck.net/known_by_Butchi.html
+Retrieving: http://python-data.dr-chuck.net/known_by_Anayah.html
+
+
+The answer to the assignment for this execution is "Anayah".
+Turning in the Assignment
+Enter the last name retrieved and your Python code below:
+Name:  (name starts with S)