Change Pandas on Polars package

[alinzh]

• change Pandas on Polars package
• update existing tests, add tests for export MPDS

[pep8speaks]

Hello @alinzh! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file mpds_client/__init__.py:

Line 9:80: E501 line too long (88 > 79 characters)

• In the file mpds_client/export_MPDS.py:

Line 37:80: E501 line too long (84 > 79 characters)
Line 128:80: E501 line too long (84 > 79 characters)
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Line 165:80: E501 line too long (80 > 79 characters)

• In the file mpds_client/retrieve_MPDS.py:

Line 39:80: E501 line too long (81 > 79 characters)
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• In the file mpds_client/test_export_MPDS.py:

Line 11:80: E501 line too long (84 > 79 characters)
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• In the file mpds_client/test_retrieve_MPDS.py:

Line 18:80: E501 line too long (108 > 79 characters)
Line 61:80: E501 line too long (81 > 79 characters)
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Comment last updated at 2024-12-19 18:01:22 UTC

[alinzh]

This test is no longer relevant, because an error occurred in an unusual range of received data.

Also in the export_MPDS.py I replaced pickle with parquet, since polars does not support pickle

[alinzh]

Perhaps it is worth adding path for saving as an optional argument?
https://github.com/mpds-io/mpds-client/blob/master/mpds_client/export_MPDS.py#L43

[alinzh]

@blokhin, can we merge?

[blokhin]

@alinzh please, make sure first all the seven examples from here work.

[alinzh]

@blokhin, these examples were adapted by me for polars in this PR mpds-io/mpds-api#63 . All 7 examples were launched today, works correctly.