Question

By using Python, data class and Functional Programming(don't use while & for loops but you can use if statement)

Write a program that reads table with given columns from input stream. Columns are name, amount, debt. Then filter the table (condition: debt is equal to 0). After that increase debt by 42% then output the results.

Example.

User's Input:

4 - No. of People

Sam Hill 411889 36881

Angela Smith 121877 0

Nicholas Ander 783887 591951

Lance Rod 123543 0

Expected Output:

Sam Hill  411889 52371.02
Nicholas Ander 783887 840570.42

**Please also explain your answer**

Answer 1

#A Class is created which binds the name, amount and dept together into a single object
class Data: 
    def __init__(self,name,amount,dept):
        self.name=name
        self.amount=amount
        self.dept=dept

#logic of the recurssive start function :
#1.the variable n holds the total no of inputs and if it becomes zero that means our input taking is done and we can further proceed to analyze the data
def start(n,objlist):
    if n==0: #if the n becomes 0 that means our inputs are succesfull and we proceed to the analyze func
        analyzeData(objlist,len(objlist),0,[])
    else:
        str=input() # we are taking the input in a single line as a string
        str=str.split(' ') #by using split function we create a list from the input by space , ex :- "abc fgb" becomes ["abc","fgh"]
        if str[0]=='' and str[1]=='' and str[2]=='': #if any of the params are empty then we call the function agian with same n means we are retaking the input
            print("Re-enter all the 3 values, Enter again")
            start(n,objlist)
        try: #we are checking if the amount (in str[1] and dept (in str[2]) is number or not)
            str[1]=float(str[1])
            str[2]=float(str[2])
            data=Data(str[0],str[1],str[2]) #here if the amount and dept are floats then we proceed to craete the data object
            objlist.append(data) #we add the object to the list
            start(n-1,objlist) #we call this function again but instead of "n" we pass "n-1" which makes sure this input was succesfull and we can proceed to the next input
        except:#if the amount or dept is not a number then the below statements are executed which re-takes the input
            print("The amount and dept should be number, Try Again")
            start(n,objlist)        

#this functions is also a recursive function we pass the length of the array as n and an index 0
#if the value of n and i becomes equal then our analysis is over
#after each analysis we increment i by 1
def analyzeData(objlist,n,i,result):
    if n==i:#once the calculation of all the objects are done we call the printOutput  function 
        print("Result : ")
        printOutput(result,len(result),0)
    else:
        if objlist[i].dept!=0: #if the dept is not 0 the we the calculation in the next line and we add the object to the new "result" list
            objlist[i].dept=objlist[i].dept*42/100+objlist[i].dept
            result.append(objlist[i])
        i=i+1
        analyzeData(objlist,n,i,result) #after 1 analysis or calculation we increment i with 1 and call the function again which will then do the calculation on the next object
            
def printOutput(result,n,i):#This function prints the results recursively
    if n==i:
        pass
    else:
        print(result[i].name,result[i].amount,result[i].dept)
        i=i+1
        printOutput(result,n,i)


# The Program starts from here 
# Note : Because in the question you have mentioned that I cannot use for and while loops
# I have used recursion throughout whenever looping was needed
print("Enter no of inputs : ")
n=int(input()) 
print("Enter name, amount and dept");
objlist=[] #empty list which will hold the objects in future
start(n,objlist) #the number of inputs and an empty array is passed in this function