[Tutor] Urgent: Help

Michael H. Goldwasser goldwamh at slu.edu
Mon Jan 7 22:08:43 CET 2008

Very good questions indeed.  Also familiar ones to me. The first is
Exercise 5.28 and the second is Exercise 5.23 from the text book
"Object-Oriented Programming in Python."

Alan's advice was very sound, but I strongly recommend that you work
with your instructor in guiding you through these problems.  He or she
is best qualified to know your current level and the context for such
a homework assignment. Of course, reading the book is also likely to

For everyone else, if you like these exercises there are 300 more
where they came from.  ;-)

With regard,

       | Michael Goldwasser
       | Associate Professor
       | Dept. Mathematics and Computer Science
       | Saint Louis University
       | 220 North Grand Blvd.
       | St. Louis, MO 63103-2007

On Sunday January 6, 2008, Shumail Siddiqui wrote: 

>       Investment Thresholds   
>          Define a Python function threshold(dailyGains, goal) that behaves as follows. The first parameter is a list of integers that represent the daily gains in the value of a stock. The second paramter is a single positive number that is a profit goal. The function should return the minimum number of days for which the stock should be owned in order to achieve a profit that is equal to or greater than the stated goal. If the goal is unreachable, the function should return 0.   
>    For example,   
>    threshold ([5, 3, 8, 2, 9, 1], 17)   
>    should return 4 because the goal (17) can be reached after the first four days (e.g., 5 + 3 + 8 + 2).   
>          Write a small Python program that uses your threshold() function to demonstrate that it works correctly. Your program may use a pre-defined list of stock gains or it may generate one randomly (see the "Helpful Hints" section below for tips on how to do this). Your program should display this list, prompt the user to enter a profit goal, and then print out the total number of days required to reach that goal (or a message stating that the goal is impossible).   

>       Word Windows   
>          Define a Python function sliding(word, num) that behaves as follows. It should print out each num-length slice of the original word , aligned vertically as shown below.   
>    For example, a call to sliding("examples", 4) should produce the output   
>    exam   xamp    ampl     mple      ples      
>          Write a small Python program to demonstrate that your sliding() function works correctly. Your program should prompt the user to enter a word and a window size, and then call sliding() with those values.   

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