mode (snippet)

Python example 'mode'

Functions in program:

• def mode(data):
• def reduce_data(data):

mode

Python beginners example: mode

#!/usr/bin/python
# -*- coding: utf-8 -*-


# Mode
# mode or modal value, is the number in data
# that has highest frequency, or occurs in data/array
# maximum number of times

# This function produces an outline of data
# each element occurs only once in outline
# that means no repeats of same numbers
def reduce_data(data):
    # Simplest way to do this, just 1 line of code:
    # return list(set(data))
    # since set data structure does not have repeats

    # But below code is much more
    # illustrative and easier to understand

    data_outline = []
    for item in data:
        if item not in data_outline:
            data_outline.append(item)

    return data_outline

# To find mode, we apply same principle, that works
# behind finding the maximum or minimum number(see max.py, min.py)
def mode(data):
    mode_ = data[0]
    max_frequency = data.count(data[0])

    # Insted of iterating through every repeat of 
    # same number, then counting multiple repeats
    # of number multiple times, iterating through outline
    # of data is convinient, less time consuming.
    for value in reduce_data(data[1:]):
        if data.count(value) > max_frequency:
            mode_ = value 
            max_frequency = data.count(value)

    # instead of just mode, it's freq 
    # can also be helpful
    return (mode_, max_frequency)

# Test
# Add your test cases
tests = [
    [19, 17, 25, 34, 57, 17, 25, 52, 47, 42, 25, 17, 3, 0, 3, 41, 17],
    [1917, 2534, 5717, 1725, 5247, 1917, 4117, 5717, 17303, 1917],
]

# Function does work, 
# Check yourself
for test in tests:
    modal_v = mode(test)
    print("\nData outline: {}".format(reduce_data(test)))
    print("Mode: {}\nFrequency: {}".format(modal_v[0], modal_v[1]))

print("")

# Mode for un-grouped data

Useful links

• Learn Python: https://pythonbasics.org
• Download Python: https://python.org