读取字典到self

Question

我有一个类，它正在做很多事情。最后，一切都陷入了困境。当我重新运行这个类时，我希望读取pickle，而不是再次执行所有操作。不幸的是，如果我解pickle，变量总是空的。为什么会这样呢?

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，变量是正确的…

Answer 1

如果我想缓存一些计算结果，我将在类外加载/转储对象，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