Python下pickle加載文件問題

寫入磁盤文件的代碼爲：

with open(file_path, "w") as f:

    pickle.dump(data,f)

加載文件的代碼爲

with open(result_fold+"A.pkl", "rb") as f:

    A = pickle.load(f)

此時會報錯：No module named multiarray

把加載處open的參數"rb"改成"r"，就不報錯了，不清楚原因。