Streamline sample Colab notebook & avoid (suppress?) errors

[mdingemanse]

Working through this Colab notebook I noticed its output is not entirely selfexplanatory yet and also it generates some errors that may throw off beginners:

1. final CSV also includes gaze, should have only speech (this cell should have line 5 uncommented)
2. parsing EAF generates an error (it works, but looks alarming — can this be suppressed or avoided?)
   /usr/local/lib/python3.10/dist-packages/pympi/Elan.py:1471: UserWarning: Parsing unknown version of ELAN spec... This could result in errors... warnings.warn('Parsing unknown version of ELAN spec... '
3. saving corpus locally (this cell) throws an error

---------------------------------------------------------------------------

TypeError                                 Traceback (most recent call last)

[<ipython-input-12-3af648ec5aa5>](https://localhost:8080/#) in <cell line: 2>()
      1 # Save the corpus as a .csv file locally
----> 2 Dutch_corpus.write_csv(path = "Dutch_corpus.csv")

8 frames

[/usr/local/lib/python3.10/dist-packages/sktalk/corpus/write/writer.py](https://localhost:8080/#) in <lambda>(x)
     52         norm = pd.json_normalize(data=metadata, sep="_")
     53         df = pd.DataFrame(norm)
---> 54         df[:] = np.vectorize(lambda x: ', '.join(
     55             x) if isinstance(x, list) else x)(df)
     56         return df

TypeError: sequence item 0: expected str instance, dict found

[liesenf]

1. final CSV also includes gaze, should have only speech

• changed the default and only speech tiers are now selected

2. parsing EAF generates an error (it works, but looks alarming — can this be suppressed or avoided?)

• the warning message originates from dependency pympi . I will have to check whether it can be suppressed there. Since it's just a warning, I address 3. first.

3. saving corpus locally throws error

• function write_csv encounters a TypeError if metadata is provided in metadata fields. Proposed solution ready for review in linked pull request.