Create tkinter nested treeview from nested dictionary

Question

I have a nested dictionary like this that I want to use to populate a hierarchical treeview.

hierarchy = {
                'a': {
                    'b': {
                        'e': 'DATA',
                        'f': 'DATA',
                        'g': {
                            'h': 'DATA',
                            'i': 'DATA',
                            'j': 'DATA'
                        },
                        'm': {
                            'n': 'DATA',
                            'o': 'DATA',
                            'p': 'DATA'
                        }
                    },
                    'c': 'DATA',
                    'd': 'DATA'
                }
            }

The code should walk down the nested dictionary and create appropriate tk treeview nodes. Basically replicating PyCharm's view that lets you open a nested dictionary and drill down as far as you like.

I am pasting the code I wrote below but the recursion doesn't work at all. I am only pasting it for the convenience of not having to re-create a tk window etc.

root = tk.Tk()
root.geometry("900x900")
tree = ttk.Treeview(root)
ttk.Style().configure('Treeview', rowheight=30)
tree["columns"] = ("one", "two", 'three')
tree.column("one", width=100)
tree.column("two", width=100)
tree.heading("one", text="a")
tree.heading("two", text="b")
tree.heading("three", text="c")

nodes = {}

def add_node(elem):
    for i, j in elem.items():
        if isinstance(j, dict):
            add_node(j)
        else:
            if i in nodes.keys():
                nodes[j] = tree.insert(i, 1, j, text=j)
            else:
                nodes[i] = tree.insert("", 1, i, text=i)

for k, v in hierarchy.items():
    add_node(k)

tree.pack(expand=True, fill='both')
root.mainloop()
root.destroy()

Unrelated: use i in nodes instead - O(1) instead of O(n) with keys(). — meowgoesthedog
– meowgoesthedog, Commented Jul 15, 2019 at 9:10

delica · Accepted Answer · 2019-07-15 12:01:21Z

3

I figured it out:

root = tk.Tk()
root.geometry("900x900")
tree = ttk.Treeview(root)
ttk.Style().configure('Treeview', rowheight=30)
tree["columns"] = ("one", "two", 'three')
tree.column("one", width=100)
tree.column("two", width=100)
tree.heading("one", text="a")
tree.heading("two", text="b")
tree.heading("three", text="c")

def add_node(k, v):
    for i, j in v.items():
        tree.insert(k, 1, i, text=i)
        if isinstance(j, dict):
            add_node(i, j)

for k, v in hierarchy.items():
    tree.insert("", 1, k, text=k)
    add_node(k, v)

tree.pack(expand=True, fill='both')
root.mainloop()

answered Jul 15, 2019 at 12:01

delica

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