pickleに追記と読み出し

a.py

import pickle

def dump_seq(r, of):
    with open(of, "wb") as f:
        pickle.dump(next(r), f)

    try:
        while True:
            with open(of, "ab") as f:
                pickle.dump(next(r), f)
    except StopIteration as e:
        pass

def load_seq(fp):
    try:
        while True:
            yield pickle.load(f)
    except EOFError as e:
        raise StopIteration(e)

# https://raw.githubusercontent.com/uiuc-cse/data-fa14/gh-pages/data/iris.csv
r = pd.read_csv(open("iris.csv"), chunksize=20)
        
dump_seq(r, "o")

with open("o", "rb") as f:
    for i, x in enumerate(load_seq(f)):
        print(i, x)