[Python] How to create a list of dictionaries which store a list [closed]

I could not find a clear answer to my question, so I try to explain myself with code.

my_dict = {}

for i in range(10):
z_list = []
for j in range(10):
if i>3:

my_dict.append({
"i_index": i,
"j_index": j,
"z_index":[]
})
else:
z_list.append([i, j, i+j])

my_dict["z_index"].append(z_list)


I get

'dict' object has no attribute 'append'


at this line

my_dict.append({


So I tried to make my_dict a list

my_dict = []


but got

list indices must be integers or slices, not str


at this line

my_dict["z_index"].append(z_list)


how can I solve the problem?

Thank you!

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