Question

Use Python:

Susie is learning arithmetic, but she’s not so good at it yet. When the teacher writes down the sum of several numbers together, like 1 + 3 + 2 + 1, Susie has to rearrange the numbers into ascending order before adding them. For example, she would rearrange the previous example to 1 + 1 + 2 + 3 before doing the math. Complete the function math help(problem) that takes a string representing a math problem and rearranges the digits so that Susie can compute the sum. The function will return the rearranged sum as a string. You may assume that only digits 1, 2 and 3 appear in the argument string problem. You may also assume that at least one + symbol appears in problem and that problem is always formatted properly.

Example:

Function Call	Return Value
math help(’3+2+1+1’)	’1+1+2+3’
math help(’1+2+3’)	’1+2+3’
math help(’2+2’)	’2+2’
math help(’1+3+2+3+2+1+3+2+3+1+2’)	’1+1+1+2+2+2+2+3+3+3+3’

----------------

def math_help(text):
    # Fill in your code here
    return None # Change or replace this line

if __name__ == "__main__":

    ############### Tests ###############
    print('Testing math_help() for \"3+2+1+1\": \"' +
        str(math_help('3+2+1+1')) + '\"')
    print('Testing math_help() for \"1+2+3\": \"' +
        str(math_help('1+2+3')) + '\"')
    print('Testing math_help() for \"2+2+2\": \"' +
        str(math_help('2+2+2')) + '\"')
    print('Testing math_help() for \"1+3+2+3+2+1+3+2+3+1+2\": \"' +
        str(math_help('1+3+2+3+2+1+3+2+3+1+2')) + '\"')

Answer 1

"""

Author:
Date :27/2/17
File Name:math_help.py
Description:

"""


def math_help(text):
    """
    :param text:
    :return:
    """

    # Split the text by + delimiter
    number_list = text.split("+")

    # Sort the list because here only single digit number  so we can  use just sort
    number_list.sort()

    # Join the above list with + sign
    result = "+".join(number_list)

    return result


if __name__ == "__main__":
    ############### Tests ###############
    print('Testing math_help() for \"3+2+1+1\": \"' +
          str(math_help('3+2+1+1')) + '\"')
    print('Testing math_help() for \"1+2+3\": \"' +
          str(math_help('1+2+3')) + '\"')
    print('Testing math_help() for \"2+2+2\": \"' +
          str(math_help('2+2+2')) + '\"')
    print('Testing math_help() for \"1+3+2+3+2+1+3+2+3+1+2\": \"' +
          str(math_help('1+3+2+3+2+1+3+2+3+1+2')) + '\"')

output: