В файле записаны данные о результатах сдачи

def get_list_from_file(file_name, min_score):
    with open(file_name, encoding='UTF-8') as file:
        return [line for line in file.read().split("\n") if line and int(line.split()[2]) > min_score]
 
 
def write_to_file(file_name, students_list):
    with open(file_name, 'w', encoding='UTF-8') as out_file:
        for line in students_list:
            out_file.write(' '.join(line) + "\n")
 
 
def get_final_list(a_list):
    return _get_sorted_list(list(map(_rebuild, a_list)))
 
 
def _get_sorted_list(a_list):
    return sorted(a_list, key=lambda x: x[2], reverse=True)
 
 
def _rebuild(line):
    fields = line.split()
    return (fields[1][0] + ".", fields[0], fields[2])
 
 
if __name__ == '__main__':
    students = get_list_from_file('results.txt', 80)
    students = get_final_list(students)
    write_to_file('only_best.txt', students)

def getPs(filepath='in.txt'):
    with open(filepath,'r') as file:
        return [line.split(' ') for line in file.read().split('\n') if int(line.split(' ')[2])>80]
 
def writePs(li,filepath='out.txt'):
    sortedList=sorted(li,key=lambda x:int(x[2]),reverse=True)
    with open(filepath,'w') as file:
        for sname,name,score in sortedList:
            file.write("{0}. {1} {2}\n".format(name[:1],sname,score))
    
stlist=getPs()
writePs(stlist)