Question

Define a function called collapse() which takes a list as input. Each element of the list will either be an integer, or a list of integers. The function should modify the input list by replacing all of the elements which themselves are lists with the sum of their elements.

For example:

Test	Result
vals = [1, 2, 3, 4, 5] collapse(vals) print(vals)	[1, 2, 3, 4, 5]
vals = [1, [2, 3], 4, 5] collapse(vals) print(vals)	[1, 5, 4, 5]

and

Define a function called get_number that repeatedly asks the user to enter a number until they enter a number between the values of 1 and 10 inclusive, and should return that value as a floating point number. Your function should handle any kind of input.

For example:

Test	Input	Result
print(get_number())	hello 12 10	Enter a number: hello Enter a number: 12 Enter a number: 10 10.0

and

Define a function called pair_sum() which takes two inputs: a list of integers and a total.

The function should return a list of tuples, where each value in the tuple is a different value from the input list, and where the sum of the tuple elements equals the total, and where (i, j) is a tuple in the output list, then i should appear to the left of j in the input list.

In other words, the first element of the tuple must have an index value less than the second element of the tuple.

For example, if the input list is [3, 2, 1] and the total is 4, then the output list will only contain the tuple (3, 1) and not the tuple (1, 3).

But if the input list was [3, 2, 1, 3] and the total is 4, then the output list will contain both the tuple (3, 1) and the tuple (1, 3). Neither case would contain the tuple (2, 2).

For example:

Test	Result
print(pair_sum([4, 6, 2, 7, 3], 10))	[(4, 6), (7, 3)]
print(pair_sum([4, 7, 8, 9, 3, 2, 6, 11, 1, 5, 10], 14))	[(4, 10), (8, 6), (9, 5), (3, 11)]

Answer 1

Please find the following program using python

Program: collapse

import sys

def collapse(lis):
    total=0
    for i in range(len(lis)):
        #if its a list, add it and update the list as a single element
        if isinstance(lis[i], list):
            for j in lis[i]:
                total = total + j
            lis[i]=total  

vals = [1, [2, 3], 4, 5]
collapse(vals)

print(vals)

Output:

[1, 5, 4, 5]

Program: get_number

import sys

def get_number():
    while 1:
        #if the input is not integer, ask the user again
        try:
            input1=input("Enter the number: ")
            input2 = int(input1)
            #if the input with in the range of 1 to 10, exit after the float
            if input2 >= 1 and input2 <= 10:
                return (float(input2))
        except ValueError:
            continue

print(get_number())

Output:

Enter the number: 12
Enter the number: as
Enter the number: 321
Enter the number: 7
7.0

Program: pair_sum

def pair_sum(lis1, value):
    itr =0
    out=[]
    tup=()
#iterate the complete list
    for i in lis1:

        total=0
#iterate the same list again and always compare it with the next indxed element
#from outer loop
        for j in range(len(lis1)):
            if j > itr:
                total = i + lis1[j]
                if total == value:
                    tup=(i,lis1[j])
#append the tuple to the list
                    out.append(tup)
                    break
        itr = itr + 1
#return the list of tuples that has sum of the value
    return (out)

print(pair_sum([3,2,1,3], 4))

print(pair_sum([4, 7, 8, 9, 3, 2, 6, 11, 1, 5, 10], 14))

Output:

[(3, 1), (1, 3)]
[(4, 10), (8, 6), (9, 5), (3, 11)]

Screen shots