Question

PYTHON IS3073

1. A group of statisticians at a local college has asked you to create a set of functions that compute the median and mode of a set of numbers, as defined in Section 5.4. Define these functions in a module named stats.py. Also include a function named mean, which computes the average of a set of numbers. Each function should expect a list of numbers as an argument and return a single number. Each function should return 0 if the list is empty. Include a main function that tests the three statistical functions with a given list.

7. Write a program that inputs a text file. The program should print the unique words in the file in alphabetical order.

8. A file concordance tracks the unique words in a file and their frequencies. Write a program that displays a concordance for a file. The program should output the unique words and their frequencies in alphabetical order. Variations are to track sequences of two words and their frequencies, or n words and their frequencies.

Answer 1

1) The Python code to compute mean, median and mode of a set of data is given below.

Input the data as an array to each functions.

def mean(data):
    total = 0
    num_elements =len(data)
    if(num_elements  == 0):
        return(0)
    for item in data:
        total = total + item
    mu = total / (num_elements) # alternately mean = (total / len(data))
    return (mu)

def median(data):
    num_elements =len(data)
    if(num_elements  == 0):
        return(0)
    data.sort()
    # determine even or odd
    even = True
    if len(data)%2 == 1:
        even = False
    if even:
        slice_start = (len(data)//2) - 1
        slice_end   = (len(data)//2) + 1
        me      = sum(data[slice_start:slice_end]) / 2
    else:
        me      = data[len(data)//2]
    return (me)

def mode(data):
    num_elements =len(data)
    if(num_elements  == 0):
        return(0)
    hits = []
    for item in data:
        tally = data.count(item)
        values = (tally, item)
    # Only add one entry for each number in the set
        if values not in hits:
           hits.append(values)
    hits.sort(reverse=True)
    if hits[0][0]>hits[1][0]:
        return(hits[0][1])
    else:
        print("\nThere is not a mode")
        return(0)

if __name__ == "__main__":
    data = [2,4,6,5,7,8]
    print("\nThe mean is:", mean(data))
    print("\nThe median is:", median(data))
    print("\nThe mode is:", mode(data))

The output is:

The mean is: 5.333333333333333

The median is: 5.5

There is not a mode

The mode is: 0

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