[Python] How to read pickle file?

I created some data and stored it several times like this:

with open('filename', 'a') as f:
pickle.dump(data, f)


Every time the size of file increased, but when I open file

with open('filename', 'rb') as f:
x = pickle.load(f)


I can see only data from the last time. How can I correctly read file?

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