Iterate through a complex dictionary with python

I would like to browse this dictionary especially the lines sub-array

my_dict= {
  "alla": "koko",
  "messages": [
  {
    "env": "dlo",
    "detail": "cons"
  }
],
"commandes": [
{
  "comande_numero": "lkm02",
  "date": "14/10/2022",
  "lignes": [
    {
      "product": "mango",
      "designation": "04 pacquets of mango",
      "quantite": 14
    },
    ......
    ]
  }
 ]
}

I tried

all_product=my_dict['commandes']
for one_ligne in all_product.lignes:
    // my code

but i have an error,
So how to browse the rows sub-array located at the dictionary level

>Solution :

"commandes" is a list, not a dictionary, so iterate properly:

all_product=my_dict['commandes']
for product in all_product:
    for ligne in product["lignes"]:
        // your code