Reading python pickle of dict in MATLAB causes error

I have a pickle file of a python dictionary whose keys are tuples `(10, 11), (10, 12), (11, 10), (11, 12), (12, 10), (12, 11)`.

I use the following commands to read them

    fid = py.open('file.pickle','rb');
    data = py.pickle.load(fid);

At this point, I think the code is working correctly as

data.keys()

in MATLAB gives the correct answer as

dict_keys([(10, 11), (10, 12), (11, 10), (11, 12), (12, 10), (12, 11)])

The equivalent of dict in python is structures ([1]) so when I try to convert it to `struct` using

data=struct(data)

, I get an error as

Error using py.dict/struct
Field names must be non-empty character vectors or a string
scalars.

What does the error mean here?

[Mohammad Sami]

According to matlab documentation, the fieldnames for structure have the following requirements, which your data does not meet.

field — Field name

character vector | string scalar

Field name, specified as a character vector or string scalar. Valid field names begin with a letter, and can contain letters, digits, and underscores. The maximum length of a field name is the value that the namelengthmax function returns.

[BABA CHOUDHURY]

@Mohammad Sami where exactly is the error and is the problem related to writing in python or reading in matlab?

[Mohammad Sami]

Based on the output you have shown in your question, the keys are numeric values. As stated in the documentation matlab struct does not support these as field names. (see valid fieldname criteria)

[Mohammad Sami]

You can see this answer on how you can convert your dictionary into a Matlab type containers.Map.

https://www.mathworks.com/matlabcentral/answers/526384-how-do-i-convert-a-python-dictionary-to-a-matlab-type

Answer 1

[Asvin Kumar]

Map containers might be what you're looking for.