-1

I want to declare a nested dictionary, with the key value pairs being a string and dict, with this nested dict having a key value pair of string and int). How would I go about doing this? Thanks!

AMC
  • 2,642
  • 7
  • 13
  • 35
mm21
  • 21
  • 3

1 Answers1

2

The same way as you make a regular dictionary, except put it inside another dictionary. 

outer_dict = {
  "inner1": {
    "keyA": 1,
    "keyB": 2,
    "keyC": 3,
  },
  "inner2": {
    "keyD": 4,
    "keyE": 5,
    "keyF": 6,
    "keyG": 7,
  },
}

If you wanted to annotate this with type hinting, you would do essentially the same thing, putting a Dict inside another Dict:

outer_dict: Dict[str, Dict[str, int]] = { ... }
Green Cloak Guy
  • 23,793
  • 4
  • 33
  • 53
  • 3
    @mohammedwazeem The outer one is a dict. It has two keys: `"inner1"` and `"inner2"`. A set *would* also use curly brackets, but a set doesn't have keys (so, `{1, 2, 3}` would be a set, but `{1: 1, 2: 2, 3: 3}` would be a dict). If you try copypasting this code into a python console and to `type(outer_dict)`, it says ``. – Green Cloak Guy Mar 25 '20 at 03:20
  • 1
    hi thanks for the help, if I don't have any data to put in yet and just want to declare it i use the type hinting as you suggested? thanks! – mm21 Mar 25 '20 at 03:37
  • @mm21 If you're just declaring it then yes, that's how you would use type hinting. – Green Cloak Guy Mar 25 '20 at 03:38
  • sorry i am still confused, would I not do outer_dict = Dict[str, Dict[str, int]] – mm21 Mar 25 '20 at 03:41
  • @mm21 What do you mean by _declare it_ ? – AMC Mar 25 '20 at 03:41
  • sorry i mean to say initialize it, in C++ you would say map outerdict , so I am trying to do this in python – mm21 Mar 25 '20 at 03:45
  • @mm21 As type hinting always goes, you can just declare a variable by doing `variablename: Type`, without assigning it to anything explicitly. Though it's probably a good idea to at least set it to whatever the "zero" or "empty" type. – Green Cloak Guy Mar 25 '20 at 03:48