将字典读入自己

Question

我有一个 class 正在做很多事情。最后，它把所有的东西都保存在泡菜里。当我重新运行此 class 时，我想阅读泡菜而不是重新做所有事情。不幸的是，如果我解开，变量总是空的。为什么会这样？

import pandas as pd

class Test:
    def __init__(path, value):
        # path points to a .txt file but its in the same folder as the pickle
        data_path, data = os.path.split(path)
        pickle_path = os.path.join(data_path, name.split('.')[1] + '.pickle'
        if os.path.isfile(pickle_path):
            self = pd.read_pickle(path)
        else:
            # do a ton of stuff and safe it as pickle afterwards

variable = Test(path, value)

在这种情况下，如果我从 pickle 中读取变量是空的，但如果我执行所有操作则变量是正确的...

Answer 1

如果我想缓存一些计算结果，我会 load/dump class 之外的对象，比如

pickle_path = os.path.join(data_path, name.split('.')[1] + '.pickle'
if os.path.isfile(pickle_path):
    with open(pickle_path, 'rb') as f:
        variable = pickle.load(f)  # use cached results
else:
    variable = Test()  # do all the calculations

将字典读入自己

read a dict into self

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