PYTHON

Use Lists and Dictionaries to enhance and improve your Cake Program; to achieve flexibility, efficiency and readability

Specifications

1. Use the template provided to assist you in Lab 5 Part 2(Extra Credit); either download it from the Lab 5 assignment page in Canvas and use it as your base or use what you've developed for Part 2 if you've completed it.
2. Modify the program to use (3)Dictionaries to store the (3)recipes
3. Replace the 3 individual functions for calculating and outputting ingredients (calc_n_output_chocolate_ingrd, calc_n_output_redvelvet_ingrd, calc_n_output_lemon_ingrd) with one fully parameterized function with cake_wt and ingredient dictionary as its parameters and return a list which contains all the ingredients weights for the cake specified by the recipe dictionary. No more hard-code inside the function. And, also remove the call to print_ingrd(), because it will be called from the main program. The call statement and the function header should be like this:

   • choc_ingrd_list = calc_ingrd( choc_cake_wt, choc_recipe ) # e.g. for the chocolate cake

   • def calc_ingrd( cake_wt, recipe )

   • where choc_ingrd_lst is a List and choc_recipe is a Dictionary

4. Modify the print_ingrd() function such that it can be called from the main program, after calling calc_ingrd, and you can simply use a loop inside the function to print the ingredients. The calling statement and function header should look like this:

   • print_ingrd ( choc_ingrd_lst, ingrd_names_list ) # make this call after calling calc_ingrd(), from the main program

   • def print_ingrd ( ingrd_list, ingrd_names )
   • where choc_ingrd_list is what was returned from calling calc_ingrd and ingrd_names_list is a list of string literals which are the names for all the possible ingredients, e.g. ["Flour", "Sugar", ", "Unsweetened Cocoa Powder", .... ]

Now you have a much cleaner, efficient and flexible program providing ease of maintenance and further modification - for more cake types, changing recipes, etc.

Checkpoints:

• Use dictionaries to define recipes
• Use lists as argument, parameter and return of a function
• Build up a list by using some list methods and functions. That is the most critical part in the function calc_ingrd(). There could be several different ways to achieve that.
• All the Documentation Requirements stated in previous lab assignments still apply.

def print_ingrd(flour_wt, sugar_wt, ...list of all possible ingredients for all cakes...): """ This general print function has a parameter list that includes all possible ingredients, for all cakes. Print only those ingredients which are in the current cake recipe - with non-zero values. """

if flour_wt != 0: print( ... ) if sugar_wt != 0: print( ... ) if unsweetened_cocoa_powder_wt != 0: print( ... ) . . .

if ... != 0 # last ingredient print( ... )

# Test code - back calcuation to get total weight # calculate total weight here print( ... total weight ... )

def calc_n_output_chocolate_ingrd(cake_wt): # Chocolate cake recipe; in percentage of total weight CHOC_FLOUR_PCT = CHOC_SUGAR_PCT = . . .

# create and initialize all variable to zero flour_wt = 0 sugar_wt = 0 . . .

""" *************************************************** CALCULATE *************************************************** """ # calc wt for each ingredient which is in the recipe sugar_wt = ... unsweetened_cocoa_powder_wt = ... baking_powder_wt = ... . . .

""" *************************************************** OUTPUT *************************************************** """ # output ingredient list by calling print_ingrd() print_ingrd( ... complete list of all possible ingredients, including even those with zero values ... )

def calc_n_output_red_velvet_ingrd(cake_wt): . . . SIMILAR TO calc_n_output__chocolate_ingrd() . . .

def calc_n_output__lemon_ingrd(cake_wt): . . . SIMILAR TO calc_n_output__chocolate_ingrd() . . .

""" ******************************************************************************* PROGRAM STARTS HERE ******************************************************************************* """

# CONSTANTS: Cake size weights in oz LARGE_CAKE_WT = ... REGULAR_CAKE_WT = ...

# define and initialize Cake Variables for the main program choc_cake_tot_wt = #... AND 2 MORE variables for the cake sizes ...

# ... Similar variables for red velvet ...

# ... Similar variables for lemon ...

""" *********************************************************** INPUT *********************************************************** """ cake_type = input( ... ) if not( cake_type == 'q' or cake_type == 'Q' ): cake_size = input( ... )

""" ************************************************* ... sentinel while loop here ... * * . . ... One set of Cake Variables (defined above) will be updated for each round . . * * ************************************************* """

""" *********************************************************** CALCULATE & OUTPUT *********************************************************** """ # Figure out the correct words for print-out

# the printing of header could be done insider the function # too, but this is simpler implmentation print(... header for Chocolate Cake orders ... ) calc_n_output_chocolate_ingrd( choc_cake_tot_wt )

print(... header for Red Velet Cake orders...) calc_n_output_red_velet_ingrd(redv_cake_tot_wt)

print(... header for Lemon Cake orders...) calc_n_output_lemon_ingrd(lemo_cake_tot_wt)

Chocolate Cake Recipe: Flour - 15.8% Sugar - 24.5% Unsweetened Cocoa Powder - 5.6% Baking Powder - 0.4% Baking Soda - 0.6% Salt - 0.4% Egg - 9% Buttermilk - 18.0% Canola Oil - 8.1% Vanilla Extract - 0.6% Boiling Water - 17.0%

Red Velvet Cake Recipe: Flour - 22.4% Sugar - 22.4% Baking Soda - 0.7% Salt - 0.4% Unsweetened Cocoa Powder - 0.4% Canola Oil - 24.0% Buttermilk - 17.9% Egg - 9.0% Red Food Coloring - 2.1% Vanilla Extract - 0.3% Distilled Vinegar - 0.3%

Lemon Cake Recipe: Butter - 8.5% Sugar - 15.0% Egg - 9.0% Sifted Self-Rising Flour - 15.6% Buttermilk - 9.0% Vanilla Extract - 0.2% Filling: Egg Yolk - 17.9% Sugar - 11.3% Butter - 2.1% Lemon Juice and Zest - 11.4%