[Tutor] how to delete some quasi-duplicated keys

[lina]

#!/usr/bin/python3

dehydrons={}
pairs={}
#frozen set way pairs
fs_pairs={}
occurence={}
total=0
dictionary={}
candidate_dehydron={}


if __name__=="__main__":

    with open("dehydron_refined_data_18.txt","r") as f:
        for line in f.readlines():
            parts=line.split()
            #pair=set((parts[0],parts[1]))
            if (parts[0],parts[1]) not in dehydrons.keys():
                dehydrons[(parts[0],parts[1])]=parts[2]
                occurence[(parts[0],parts[1])]=1
                #pair=frozenset(('parts[0]','parts[1]'))
                #pairs[pair]=pairs.get(pair,0)+parts[2]
            else:
                occurence[(parts[0],parts[1])]+=1
            #for k, v in dehydrons.items():
            #print(k,v)


        for k, v in occurence.items():
            if v>=25:
                #print(v,k)
                candidate_dehydron[k]=v
            #print("{:.2f}".format(v/2768*100),k)
            total+=v
        print(total)

        for k, v in candidate_dehydron.items():
            pairs[k] = v


        '''for key in pairs.keys():
            if key[::-1] in pairs:
                pairs[key] += pairs[key[::-1]]
                del pairs[key[::-1]]
            print(pairs)'''


        #for k, v in pairs.items():
            #print(v,k)



            I attached the not working code,  Thanks for any advice,


best regards,