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Plotting a frequency chart form a set of values


I have got a list of results from my function already. And now, I need to visualise this information and plot a chart of how many times each particular value is repeated in a list. I know how to do a histogram, but it shows intervals of values, but not specific values. I need to access all the values afterwards as well and be able to work with them.

I have found also that I can count values using a command "count" list.count() if it is necessary to do it like this in my problem. I'd like to ask what is the code for such frequency chart (or plot of points)? And how do I need to define my variables? Would be much appreciated if someone could help in any way. Thank you very much.