CS 4950 Lab 6

CS 4950 Spring 2017

Lab 6

Find a computer and log into the OSX side using your CS login name and password.

Open Firefox and find the class web page.

Open TextWrangler - use the finder window and go to applications.
Open a new text file, called Lab6.txt, to record your work today - you will paste in some of your command lines. The header of the file should look like:

Your Name
CS 4950
Lab 6
April 5, 2017

Find the Terminal - use the finder window and go to applications and then utilities.

We will start by writing the molecular weight program on page 156.
The first step is to create the dictionary of molecular weights:

find the file aminoacid_table.html in the books examples using Finder
drag the file to Firefox
once it is open, use Command-u to get the source code
copy the source code you will need to create the dictionary into TextWrangler
now write a regular expression to capture the letter and weight data (see bottom of page 156)
turn it into a dictionary be adding the name = { at the beginning and } at the end

Once you have the dictionary created, iterate through it with a for loop to compute the molecular weight of a given string. You might want to experiment with some strings of your own.
You can follow the example at the top of page 157.
Cut and paste your program and the results of running it into your Lab5.txt file.

Now that you have a dictionary, lets experiment with some of the functionality available for dictionaries:

Use the .get() function to retrieve the molecular weight for 'E'
Try printing the dictionary - what do you notice about the result?
Now try printing the keys and values separately
Next print the sorted key and compare to the keys you printed above
Modify the dnacalc.py program form earlier, using the code in the box in the middle of page 158

notice the percent calculation done in a single line
notice the formatted printing

Here are some things we would like to do with lists:

create a list from a string

create a list from the string "FDILSATFTYGNR"

define an empty list

MyList = []

define a list with elements in it

define a new list with the elements cat, dog, bird

define numerical lists with the range function

use the range function to define a list containing 1,2,3,4,5,6,7,8,9,10
can we use the range function to create the same list but in descending order?

parse strings into lists with .split()

figure out how to use split to turn the string "to be or not to be" into a list of words

added elements to lists with .append()

use the list you created with cat, dog, bird, append snake and rat

insert elements to a specific place in a list

create a list with 1,2,3,4,5 then inert the elements 9,8,7 in between 2 and 3

delete elements for a list with del

delete elements 7 and 3 from the list above using indexes and del

delete indexed elements in a list with assignment to []

delete elements 7 and 3 from the list above using assignment

use the .join() function to create a string from a list

you create a list of your choice and then turn it into a string

Again, cut and paste you command lines and output, and any programs you write into Lab5.txt

Viewing HTML Source on different browsers

To be able to view the source code of a webpage under Safari, you first need to enable the Developer menu:

Click on Safari menu > Preferences > Advanced.
Check "Show Develop menu in menu bar".
Close the Preferences window.
Go to the Develop menu > Show Page Source.

ccm.net/faq/33026-safari-view-the-source-code-of-a-webpage

For Chrome: View -> Developer -> View Source

For Firefox: Command-u

Turn it in:
Go to the CS Homework Submission System: https://www.cs.csustan.edu/cshomework/
Choose: instructor Martin
            Spring 2017
            CS4950
              Lab6
Upload the your Lab6.txt file as prompted.