Question

Ask the user for the name of a file. Read a list of numbers of unknown length from the file. Find and print the MEDIAN and the MODE(S) of the set of numbers. Do not use python statistics functions to find the medium or mode

To find the MODE(S) Create a dictionary using the numbers as the keys, and the values are how often that number appears in the list. For instance, with this list [1,1,5], the dictionary would be frequency = [1:2, 5:1].

Answer 1

Thanks for the question.

Below is the code you will be needing  Let me know if you have any doubts or if you need anything to change.

Thank You !

Note: Please update the filename in the below line of code
 filename = 'F:\\numbers.txt'

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def read_numbers(filename):
    try:
        with open(filename, 'r') as infile:
            numbers = [eval(num) for num in infile.readlines() if len(num.strip()) != 0]
            return numbers
    except:
        return None


def main():
    filename = 'F:\\numbers.txt'
    numbers = read_numbers(filename)
    if numbers is None:
        print('Unable to read data from file: {}'.format(filename))
        return

    frequency_dict = {}
    for num in numbers:
        if num in frequency_dict.keys():
            frequency_dict[num] += 1
        else:
            frequency_dict[num] = 1

    length = len(numbers)
    numbers.sort()
    if length%2==0:
        first_num =numbers[(length-1)//2]
        second_num =numbers[(length-1)//2]
        median = (first_num+second_num)/2
    else:
        median = numbers[length//2]

    max_frequency = max(frequency_dict.values())
    modes=[]
    for num,count in frequency_dict.items():
        if count==max_frequency:
            modes.append(num)

    print('Mode: {}'.format(','.join([str(n) for n in modes])))
    print('Median: {}'.format(median))

main()

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