How to calculate occurrence percentage with respect to available options-CodePudding

I'm trying to make a polls app where user will give their input according to available choices

# they can be different also `len` of `choices` list can be changed
choices = ['Agree', 'Disagree', 'Leave Blank']

And the user_input will 1 item from the choices. like

new_user_input = 'Agree' # that could be anything from choices

I've been struggling with returning accurate results with out running multiple iterations.

Lets see what I'm trying :

def find_occurency_percentage(list_):
    return {i: round(list_.count(i)/len(list_)*100, 2)  for i in list_}

Running this function in Scenario 1:

# Fist Scenario 
all_user_inputs = ['Agree', 'Disagree', 'Agree', 'Disagree', 'Agree', ]
new_user_input = 'Agree' # that could be anything from choices
all_user_inputs.append(new_user_input)
print(find_occurency_percentage(all_user_inputs))
'''
current result = {'Agree': 66.67, 'Disagree': 33.33}
expected result = {'Agree' : 66.67, 'Disagree': 33.33, 'Leave Blank' : 00.0}
'''

My problem is I'm unable to handle it so that the result should be according to all original choices. Not just only all_user_inputs

Here are more examples to understand the problem with running compiler https://godbolt.org/z/eTqYWd54e

CodePudding user response：

This should be more understandable

from collections import Counter

def find_occurency_percentage(list_, choices):
    counts = Counter(list_)
    return {k: counts[k] / len(list_) for k in choices} 

choices = ['Agree', 'Disagree', 'Leave Blank']
all_user_inputs = ['Agree', 'Disagree', 'Agree', 'Disagree', 'Agree', 'Agree']
print(find_occurency_percentage(all_user_inputs, choices))

# {'Agree': 0.6666666666666666, 'Disagree': 0.3333333333333333, 'Leave Blank': 0.0}

CodePudding user response：

Iterate over choices instead:

{choice: round(100 * _list.count(k) / len(_list), 2) for choice in choices}

This has the added benefit of only iterating once over a much smaller input space, choices, as opposed to a theoretically much larger space, which is the user inputs.