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It is also impossible to enter a tuple in a json file, so instead the we enter:

{
"param_baseline": [null, 0]
}

...

if config['param_baseline'] is not None:
    config['param_baseline'] = tuple(config['param_baseline'])

Case of a dictionary

It is possible to enter a dictionary in the config.json.example using a nested structure:

{    
"param_reject": {
                 "grad": 4000e-13,
                 "mag": 4e-12,
                 "eeg": 40e-6
                 }
}

When the config.json.example is parsed by the Python code, config['param_reject'] is directly a dictionary, so no conversion is required.

Case of a pandas.Dataframe

Some metadata can be stored in a pandas.Dataframe and given to a MNE function (for instance mne.Epochs). So either, the information is stored into a .csv and converted into a pandas.Dataframe using:

if isinstance(config['param_metadata'], str):
    config['param_metadata'] = pd.read_csv(config['param_metadata'])

Or the user enters a dictionary in the config.json.example and this dictionary will be then converted into a pandas.Dataframe using:

elif isinstance(config['param_metadata'], dict):
    config['param_metadata'] = pd.DataFrame(list(config['param_metadata'].items()))