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"""

developed by: markmelnic

original repo: https://github.com/markmelnic/Scoring-Algorithm

Analyse data using a range based percentual proximity algorithm

and calculate the linear maximum likelihood estimation.

The basic principle is that all values supplied will be broken

down to a range from 0 to 1 and each column's score will be added

up to get the total score.

==========

Example for data of vehicles

price|mileage|registration_year

20k |60k |2012

22k |50k |2011

23k |90k |2015

16k |210k |2010

We want the vehicle with the lowest price,

lowest mileage but newest registration year.

Thus the weights for each column are as follows:

[0, 0, 1]

>>> procentual_proximity([[20, 60, 2012],[23, 90, 2015],[22, 50, 2011]], [0, 0, 1])

[[20, 60, 2012, 2.0], [23, 90, 2015, 1.0], [22, 50, 2011, 1.3333333333333335]]

"""

def procentual_proximity(source_data: list, weights: list) -> list:

"""

weights - int list

possible values - 0 / 1

0 if lower values have higher weight in the data set

1 if higher values have higher weight in the data set

"""

# getting data

data_lists = []

for item in source_data:

for i in range(len(item)):

try:

data_lists[i].append(float(item[i]))

except IndexError:

# generate corresponding number of lists

data_lists.append([])

data_lists[i].append(float(item[i]))

score_lists = []

# calculating each score

for dlist, weight in zip(data_lists, weights):

mind = min(dlist)

maxd = max(dlist)

score = []

# for weight 0 score is 1 - actual score

if weight == 0:

for item in dlist:

try:

score.append(1 - ((item - mind) / (maxd - mind)))

except ZeroDivisionError:

score.append(1)

elif weight == 1:

for item in dlist:

try:

score.append((item - mind) / (maxd - mind))

except ZeroDivisionError:

score.append(0)

# weight not 0 or 1

else:

raise ValueError("Invalid weight of %f provided" % (weight))

score_lists.append(score)

# initialize final scores

final_scores = [0 for i in range(len(score_lists[0]))]

# generate final scores

for i, slist in enumerate(score_lists):

for j, ele in enumerate(slist):

final_scores[j] = final_scores[j] + ele

# append scores to source data

for i, ele in enumerate(final_scores):

source_data[i].append(ele)

return source_data

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