Exercises D

1. Generate a Python script that performs the following behaviour when run:
   
   

   Username: joe
   invalid username

   Username: sue
   Password: 123
   invalid password

   Username: sue
   Password: abc
   access granted

2. Generate a Python script that inputs a positive integer n, and for each number between n and 1, the script will count backwards to 1. For example:
   
   

   enter n: 4
   4
   3
   2
   1
   3
   2
   1
   2
   1
   1

3. Monty Hall problem - simulate the Monty Hall gameshow using 3 doors, as shown in the following output:
   
   

   choose door 1, 2 or 3: 1
   door 3 is empty
   would you like to switch to door 2? N
   door 1 is empty

   choose door 1, 2 or 3: 1
   door 2 is empty
   would you like to switch to door 3? Y
   door 3 is prize

   choose door 1, 2 or 3: 3
   door 1 is empty
   would you like to switch to door 2? N
   door 3 is empty

4. Let's Make a Deal gameshow [modified] - Five briefcases labelled A through E, randomly contain $1, $20, $300, $4000 and $50000 respectively. Implement your most eloquent and sophisticated solution to produce the following output:
   
   Version 1:

   choose briefcase A, B, C, D or E: C
   briefcase C contains $20

   Version 2:

   choose briefcase to hold ['A','B','C','D','E']: C
   choose briefcase to open from remaining ['A','B','D','E']: D
   briefcase D contains $1
   choose briefcase to open from remaining ['A','B','E']: A
   briefcase A contains $50000
   choose briefcase to open from remaining ['B','E']: E
   briefcase E contains $20
   choose briefcase to open from remaining ['B']: E
   invalid selection
   choose briefcase to open from remaining ['B']: B
   briefcase B contains $4000
   briefcase C contains $300