import pickle

with open ('BinaryFile.dat', mode='wb') as MyFile:
    pickle.dump('Item1', MyFile)
    print(MyFile.tell())
    pickle.dump('Item2', MyFile)
    pickle.dump('Item3', MyFile)
    pickle.dump('Item4', MyFile)
    pickle.dump('Item5', MyFile)

with open('BinaryFile.dat', mode='rb') as MyReadFile:
    MyReadFile.seek(15)
    print(pickle.load(MyReadFile))