Count Terms per Record

Example

>>> from techminer2.database.field_operators import (
...     CountTermsPerRecordOperator,
...     DeleteFieldOperator,
... )
>>> from techminer2.database.tools import Query

>>> # Creates, configure, and run the operator
>>> counter = (
...     CountTermsPerRecordOperator()
...     #
...     # FIELDS:
...     .with_field("authors")
...     .with_other_field("num_authors_test")
...     #
...     # DATABASE:
...     .where_root_directory_is("example/")
... )
>>> counter.run()

>>> # Query the database to test the operator
>>> query = (
...     Query()
...     .with_query_expression("SELECT authors, num_authors_test FROM database LIMIT 5;")
...     .where_root_directory_is("example/")
...     .where_database_is("main")
...     .where_record_years_range_is(None, None)
...     .where_record_citations_range_is(None, None)
... )
>>> df = query.run()
>>> df
                                authors  num_authors_test
0  Kim Y.; Choi J.; Park Y.-J.; Yeon J.                 4
1                   Shim Y.; Shin D.-H.                 2
2                             Chen L./1                 1
3              Romanova I.; Kudinska M.                 2
4                   Gabor D.; Brooks S.                 2

>>> # Deletes the field
>>> DeleteFieldOperator(
...     field="num_authors_test",
...     root_directory="example/",
... ).run()