In Class: Week 8 Wednesday and Friday:
Nested Loops, File I/O

If you already copied over files from my week08 subdirectory, then copy over three new files in your week08 directory:

$ cd
$ cd cs21/class
$ cd week08

$ cp  ~newhall/public/cs21/week08/listoflists.py .
$ cp  ~newhall/public/cs21/week08/gradebook.txt .
$ cp  ~newhall/public/cs21/week08/gradebook.py .

$ cd
$ cd cs21/class
$ mkdir week08
$ cd week08

$ cp ~newhall/public/cs21/week08/* .

After class, you can copy over code I wrote in class doing the following:

$ cp ~newhall/public/cs21/week08/tia* .

1. Open stars.py and we will implement a function that takes a value, n, and draws two patterns of stars of size n. For example, if n is 5:

   *
   * *
   * * *
   * * * *
   * * * * *
   
           *
         * * *
       * * * * *
     * * * * * * *
   * * * * * * * * *
   

   One restriction is that we will not allow the use of the string repetion operator in this solution:

     # something like this is not allowed
   	print " *" * 5
   

   Instead the only two print statements that we can use are:

     print "*",  # this prints a single star string followed by a space 
     print " ",
   

2. Next, we are going to write a program that reads in data from a file and stores it in a list of lists. This program implements processing a gradebook for a class. It starts by reading in gradebook entries from a file. Each entry is of the form:

     Name1  grade1  grade2  grade3  ... gradeN
     Name2  grade1  grade2  grade3  ...  gradeN
   

   We are going to write a function to read in each line into a list of values, the first element will be the name string, the subsequent ones will be the grades stored as int values:

     ["name string", grade1, grade2, ... grade N]
   

   and for each list is creates it will add it to the list of lists to produce a data structure that looks like the following:

                 -------
   gradebook---> | *---|-------> ["name1 string", grade1, grade2, ..., grade N]
                 |-----|
                 | *---|-------> ["name2 string", grade1, grade2, ..., grade N]
                 |-----|
                 | *---|-------> ["name3 string", grade1, grade2, ..., grade N]
                 |-----|
                    .
                    .
                    .
                 |-----|
                 | *---|-------> ["nameM string", grade1, grade2, ..., grade N]
                 -------
   
   

   Then we will write some functions for doing something with this list of lists.
   1. printStudentInfo(student, gradebook): prints out the information about one student given its student number.
   2. printNames(gradebook): prints out the names of all students in the gradbook
   3. printQuizScores(quiznum, gradebook): prints out the student scores for the given quiznumber
   4. printGradeBook(gradebook): prints out the entire grade book contents in tabular format
   5. getAveQuizGrade(quiz_n, gradebook): returns the average quiz grade for a specific quiz
   6. getAveGrade(student, gradebook): returns the average grade for a specific student