Python 错误：列表索引必须是整数或切片，而不是 str

Question

I tried to remove duplicates of a list using set method and add that value with a key to an empty python dictionary.

But it gives me that error message

TypeError: list indices must be integers or slices, not str

I tried this way:

mydir =[]
person_trackID = "p7"
class_ids = [3 ,3 ,3 ]
print(mydir,person_trackID,set(class_ids))
mydir[person_trackID] = list(set(class_ids))
print(mydir)

please help me to solve this.Thank you

Answer 1

You are declaring a list here mydir = []

Change it to dictionary mydir = {}

Answer 2

you are doing great with one little mistake. you are declaring 'mydir' as a python list and giving it 'p7' as an index. Python list can't have string indexes. you can change the first line to following.

mydir = {}

Answer 3

You are trying to insert an item into mydir at index 'p7' (which is a string). Indices are integers and not strings . That is why the error.

Your question says that you want to insert into a dictionary and your code uses a list .

mydir = {} - This is a dictionary

mydir = [] - This is a list

Here is what you need to do:

mydir = {}
person_trackID = "p7"
class_ids = [3 ,3 ,3 ]
print(mydir,person_trackID,set(class_ids))

mydir[person_trackID] = list(set(class_ids))
print(mydir)

{} p7 {3}
{'p7': [3]}