(1) Download this file and save it in the directory where you\'ve saved your lab

Question

(1) Download this file and save it in the directory where you've saved your lab8.py file: http://www.ics.uci.edu/~harris/python/menu1.txt. Take a look at the file's contents: Its first line is a number; it says how many more lines are in the file. Each remaining line represents one Dish, with its three field values separated from one another with a tab ( ) character.

Write a function called read_menu_with_count that takes as an argument a string naming a file in this format, reads the file, and returns a list of Dish structures created from the data. (With the list returned by this function, you could print out a menu (dishlist) as you did in a previous lab. You don't have to do that again here; we're just noting how the components might fit.). Note that the price and calories fields are numbers, so you'll have to convert the text data you read (including getting rid of the dollar sign).

Test that your code also works with this file: http://www.ics.uci.edu/~harris/python/menu2.txt

(2) Next, download and examine this file: http://www.ics.uci.edu/~harris/python/menu3.txt. It's similar to the others, in that it contains lines with Dish information. But there's no count of lines at the top of the file; there's just the data.

Write a function called read_menu that takes as an argument a string naming a file in this format, reads the file, and returns a list of Dish structures created from the data.

(3) Implement the function write_menu that takes as its argument a list of Dish namedtuples and a string that names a file. Your function should write the Dish data to the named file (in the first format, with the number of dishes on the first line).

Explanation / Answer

from collections import namedtuple print ('PART C') Dish = namedtuple('Dish', 'name price calories') def read_menu_with_count(x:str)->[Dish]: file_text = open(x, 'r').read() L = file_text.splitlines() dishes = [] for j in range(len(L)): if j > 0: R =(L[j].split(' ')) dishes.append(Dish(R[0], float(R[1][1:]), int(R[2]))) return dishes assert (read_menu_with_count('menu1.txt') == [Dish(name='Chicken Biryani', price=14.99, calories=450), Dish(name='Lamb Vindaloo', price=12.00, calories=560), Dish(name='Samosa', price=3.50, calories=300)]) assert(read_menu_with_count('menu2.txt')[0] == Dish(name='Steak Sandwich', price=2.5, calories=300)) print ('PART C2') def read_menu(x:str)->[Dish]: file_text = open(x, 'r').read() L = file_text.splitlines() dishes = [] for j in range(len(L)): if j > 0: R =(L[j].split(' ')) dishes.append(Dish(R[0], float(R[1][1:]), int(R[2]))) return dishes assert(read_menu('menu3.txt')[0] == Dish(name='Wet Burrito', price=6.0, calories=700)) print ('PART C3') def write_menu(L : [Dish], f: str): newfile = open(f+'.txt', 'x') s = str(len(L)) + ' ' newfile.write(s) for i in L: newfile.write('{} ${:4.2f} {:3} '.format(i.name, i.price, i.calories)) newfile.flush() D = [Dish(name='Chicken Biryani', price=14.99, calories=450), Dish(name='Lamb Vindaloo', price=12.00, calories=560), Dish(name='Samosa', price=3.50, calories=300)] #NOTE:REMOVE THE NUMBER SIGN FOR ASSERTION STATEMENT #write_menu(D, 'anyfile') print ('PART D') Course = namedtuple('Course', 'dept num title instr units') ics31 = Course('ICS', '31', 'Intro to Programming', 'Kay', 4.0) ics32 = Course('ICS', '32', 'Programming with Libraries', 'Thornton', 4.0) wr39a = Course('Writing', '39A', 'Intro Composition', 'Alexander', 4.0) wr39b = Course('Writing', '39B', 'Intermediate Composition', 'Gross', 4.0) bio97 = Course('Biology', '97', 'Genetics', 'Smith', 4.0) mgt1 = Course('Management', '1', 'Intro to Management', 'Jones', 2.0) Student = namedtuple('Student', 'ID name level major studylist') sW = Student('11223344', 'Anteater, Peter', 'FR', 'PSB', [ics31, wr39a, bio97, mgt1]) sX = Student('21223344', 'Anteater, Andrea', 'SO', 'CS', [ics31, wr39b, bio97, mgt1]) sY = Student('31223344', 'Programmer, Paul', 'FR', 'COG SCI', [ics32, wr39a, bio97]) sZ = Student('41223344', 'Programmer, Patsy', 'SR', 'PSB', [ics32, mgt1]) StudentBody = [sW, sX, sY, sZ] def Students_at_level(S:[Student],c:str)->list: result =[] for i in S: if i.level==c: result.append(i) return result print(Students_at_level(StudentBody,'FR')[0].name) print ('PART D2') def Students_in_majors(S:[Student],m:str)->list: result= [] for i in S: if i.major==m: result.append(i) return result print(Students_in_majors(StudentBody,'CS')[0].name) print ('PART D3') def Students_in_class(S:[Student],d:str, c:str) -> [Student]: result = [] for i in S: SL = [] for j in i.studylist: SL.append(j.dept + j.num) if d+c in SL: result.append(i) return result print(Students_in_class(StudentBody, 'ICS', '32')) print ('PART D4') def Student_names(S:[Student])->list: names=[] for i in S: names.append(i.name) return names print(Student_names(StudentBody)) print ('PART D5') Sim=[] for i in StudentBody: if i.major=='CS': print (i) Sim.append(i) elif i.major=='CSE': print(i) Sim.append(i) elif i.major=='BIM': print(i) Sim.append(i) elif i.major=='INFX': print(i) Sim.append(i) elif i.major=='CGS': print(i) Sim.append(i) elif i.major=='SE': print(i) Sim.append(i) elif i.major=='ICS': print(i) Sim.append(i) for i in StudentBody: if i.major=='CS': print (i.name) elif i.major=='CSE': print(i.name) elif i.major=='BIM': print(i.name) elif i.major=='INFX': print(i.name) elif i.major=='CGS': print(i.name) elif i.major=='SE': print(i.name) elif i.major=='ICS': print(i.name) print(len(Sim)) n = 0 for i in Sim: if i.level == 'SR': n+=1 print (i.name) print(n) print(n/len(Sim)) k=0 for i in Sim: if i.level == 'FR': k+=1 print(k) total_units = 0 total_fr_ics = 0 for i in StudentBody: if i.level=='FR' and i in Students_in_class(StudentBody, 'ICS', '31'): total_fr_ics += 1 for o in i.studylist: total_units += o.units print(total_units/total_fr_ics) print('Part E')

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