Dictionaries and keys in for loop

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#1

Hi guys,

I do not quite understand what is happening here.

content_ratings = {‘4+’: 4433, ‘12+’: 1155, ‘9+’: 987, ‘17+’: 622}
total_number_of_apps = 7197

c_ratings_proportions = {}
c_ratings_percentages = {}

for each in content_ratings:
proportion = content_ratings[each] / total_number_of_apps
c_ratings_proportions[each] = proportion
c_ratings_percentages[each] = c_ratings_proportions[each]*100
print(c_ratings_proportions)
print(c_ratings_percentages)

We created this c_ratings_proportions dictionary and we defined proportion within the for loop. However, how does the program assign keys to the c_ratings_proportion. We just tell it to pull proportions from the proportion variable we defined, nothing more.

#2

Hey @furkan.demirdoven
I am not sure if i understand your question right. Could you elaborate.
Thanks
Raj

#3

hey @furkan.demirdoven

This is how we tell the dictionary what key is key and this is how we tell it what to assign as a value to the same key.

image

for every loop run each substitutes the value like:
In 1st loop - each = "4+"
In 2nd loop - `each = “12+” and so on.

hope that helps.