Actualizar suites de Expectations

Introducción a la calidad de datos con Great Expectations

Davina Moossazadeh

Data Scientist

Añadir Expectations

expectation = gx.expectations.ExpectTableColumnCountToEqual(
    value=10
)

suite = gx.ExpectationSuite(
    name="my_suite"
)

# Añadir Expectation a la Suite
suite.add_expectation(
    expectation=expectation
)

Múltiples Expectation Suites

# Create another Expectation Suite
another_suite = gx.ExpectationSuite(name="my_other_suite")
# Add the same Expectation to the new Suite
another_suite.add_expectation(expectation=expectation)

Las Expectations NO pueden pertenecer a varias Suites a la vez:

RuntimeError: Cannot add Expectation because it already belongs to an 
ExpectationSuite. If you want to update an existing Expectation, please call 
Expectation.save(). If you are copying this Expectation to a new ExpectationSuite, 
please copy it first (the core expectations and some others support 
copy(expectation)) and set `Expectation.id = None`.

Copiar Expectations

If you are copying this Expectation to a new ExpectationSuite, please copy it first 
(the core expectations and some others support copy(expectation)) and set 
`Expectation.id = None`.

Copia la Expectation, pon su .id en None y añádela a la nueva Suite sin errores:

expectation_copy = expectation.copy()

expectation_copy.id = None

another_suite.add_expectation(
    expectation=expectation_copy
)

Comprobar Expectations

print(
    expectation_copy in another_suite.expectations
)

True

Eliminar Expectations

Añadir

.add_expectation()

suite.add_expectation(
    expectation=expectation
)

Eliminar

.delete_expectation()

suite.delete_expectation(
    expectation=expectation
)

Ajustar Expectations

Actualiza el atributo .value y guarda los cambios:

expectation = gx.expectations.ExpectTableColumnCountToEqual(
    value=10
)

expectation.value = 11

expectation.save()

Asegúrate de que la Expectation pertenezca a una Suite; si no:

RuntimeError: Expectation must be added to ExpectationSuite before it can be saved.

Actualizar una Expectation Suite

suite = gx.ExpectationSuite(name="my_suite") 
validation_definition = gx.ValidationDefinition(
    data=batch_definition, suite=suite, name="my_validation_definition"
)

# Definir Expectation
col_name_expectation = gx.expectations.ExpectColumnToExist(column="GHI")

# Añadir Expectation a la Suite
suite.add_expectation(expectation=col_name_expectation)

# Ejecutar la Validation Definition asociada a la Suite
validation_results = validation_definition.run()

Guardar una Expectation Suite

Guarda los cambios en la Suite antes de ejecutar la Validation Definition para evitar errores:

validation_results = validation_definition.run()

ResourceFreshnessAggregateError: ExpectationSuite 'my_suite' has changed since it 
has last been saved. Please update with `<SUITE_OBJECT>.save()`, then try your 
action again.

Guardar una Expectation Suite

Usa el método .save() para guardar la Suite y ejecutar la Validation Definition sin errores:

suite.save()

validation_results = validation_definition.run()

print(validation_results.success)

False

Chuleta

Copiar una Expectation:

expectation_copy = expectation.copy()
expectation_copy.id = None

Comprobar si la Expectation está en la Suite:

expectation in suite.expectations

Eliminar una Expectation:

suite.delete_expectation(expectation)

Actualizar el valor de la Expectation:

expectation.value = new_value

Guardar cambios en la Expectation:

expectation.save()

Guardar cambios en la Expectation Suite:

suite.save()

¡Vamos a practicar!

Introducción a la calidad de datos con Great Expectations