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Python - how to create a CSV table using python dictionary without using any modules or imports

I have this dictionary that takes data from a csv file:

def read_results(full_file_path):
    csv_dict = {}
    with open(full_file_path,'r') as t:
        table = t.readlines()[1:]
        for line in table:
            line = line.replace('\n', '')
            line = line.split(',')
            line = list(map(float, line))
            key = (line[1], line[3])
            if key in csv_dict:
                csv_dict[key].append((line[4], line[5], line[6]))
            else:
                csv_dict[key] = [(line[4], line[5], line[6])]
        return csv_dict


#that looks like this:
{(1.0, 3.0): [(602.0, 1661.0, 0.0), (945.0, 2164.0, 0.0), (141.0, 954.0, 0.0), (138.0, 913.0, 0.0),....}

but now i need to make use of this dictionary to create a csv of my own that needs to calculate the mean of each value row to its corresponding key couple like this:

 c     b     first     finish     fix/ext 
1     3     744.67     1513.67     0.67 
0.8     3     88     858.67     0.67 
0.8     1.5     301.5     984.5     0.5 
1     1.5     419     844.5     0 

and i cant use any outside libraries or modules, what i tried until now :

def Summarize_res(results):
    with open('summary_results.csv', 'w', newline='') as f:
        header = ['c','b','first','finish','fix/ext']
        f.write(str(header))
        for line in dict:
            first = sum(line[4])/len(line[4])
            finish = sum(line[5])/len(line[6])
            fix_ext = sum(line[5])/len(line[6])


source https://stackoverflow.com/questions/71541006/python-how-to-create-a-csv-table-using-python-dictionary-without-using-any-mod

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