python - 嵌套字典中的嵌套字典，如何自动化它们？

Question

我正在尝试在另一个嵌套字典中生成一个嵌套字典，但我只能完成一个步骤。
这是我得到的代码:

variables = ['CHG', 'Open', 'Close']
assets= ['GOOG', 'FB']
dates =['28-09-2020', '25-09-2020']

dct = {x: dict(zip(assets, '0' * len(assets))) for x in dates}

得到我:

{'28-09-2020': {'GOOG': '0', 'FB': '0'}, '25-09-2020': {'GOOG': '0', 'FB': '0'}}

我如何生成字典，每个 Assets 中都有变量？
我的目标是得到这样的字典:

{'28-09-2020': {'GOOG': {'CHG':0, 'Open':0, 'Close':0}, 'FB': {'CHG':0, 'Open':0, 'Close':0}}, '25-09-2020': {'GOOG': {'CHG':0, 'Open':0, 'Close':0}, 'FB': {'CHG':0, 'Open':0, 'Close':0}}}

Answer 1

{date: {x: dict(zip(variables, '0' * len(variables))) for x in assets} for date in dates}

输出

{'28-09-2020': {'GOOG': {'CHG': '0', 'Open': '0', 'Close': '0'},
  'FB': {'CHG': '0', 'Open': '0', 'Close': '0'}},
 '25-09-2020': {'GOOG': {'CHG': '0', 'Open': '0', 'Close': '0'},
  'FB': {'CHG': '0', 'Open': '0', 'Close': '0'}}}