CSCI-UA.002 -- Python -- Summer, 2017
Nathan Hull
ASSIGNMENT 7

Due: Tuesday, August 1st

Write a program that allows a user to type an interactive series of commands which would control the turtle. Here are the possible commands:

• DEG - Sets the number of degrees (N_deg) which will be used for a future turn (Defaults to 90 if not set)
• L - Turns left N_deg degrees (defaults to 90 if DEG not previously called)
• R - Turns left N_deg degrees (defaults to 90 if DEG not previously called)
• DIST - Sets the distance in pixels (N_dist) which will be used for a future F (forward command) (Defaults to 10 if not set)
• F - Moves the turtle forward N_dist number of pixels (Defaults to 10)
• RED - Sets the pen to red
• BLUE - Sets the pen to blue
• GREEN - Sets the pen to green
• BLACK - Set the pen to black (the default)
• UP - Picks the pen up
• DOWN - Puts the pen down
• Q - Quits the program

Note that each one of these commands should call its own Function (Def). In the case of te F, L, and R commands, those functions should be sent a parameter indicating the distance or the number of degrees.

Here is a possible session which your user might have:

DIST 100 F L F L F L F L RED DEG 120 F L F L F L Q

This would draw a red triangle inside of a black box.

EXTRA CREDIT (3 points)

Prompt the user at the beginning of the program on whether he/she wants to have input from the keyboard, or from a disk file. If the disk file option is chosen, further prompt the user for the name of the file which contains the "interactive" turtle commands.

PART TWO:

• When you are done and have tested it, post your source file "smith_john_assign7" to NYU Classes.

Notes about your program:

• Make sure your program includes a comment at the beginning of the program, listing your personal
  info along with a brief synopsis of the program's function.
• You should use comments throughout the source code to explain key steps and calculations.
• Choose intuitive names for variables.