great_expectations.expectations.core.expect_column_values_to_be_unique

Module Contents

Classes

ExpectColumnValuesToBeUnique(configuration: Optional[ExpectationConfiguration] = None)

Expect each column value to be unique.

class great_expectations.expectations.core.expect_column_values_to_be_unique.ExpectColumnValuesToBeUnique(configuration: Optional[ExpectationConfiguration] = None)

Bases: great_expectations.expectations.expectation.ColumnMapExpectation

Expect each column value to be unique.

This expectation detects duplicates. All duplicated values are counted as exceptions.

For example, [1, 2, 3, 3, 3] will return [3, 3, 3] in result.exceptions_list, with unexpected_percent = 60.0.

expect_column_values_to_be_unique is a column_map_expectation.

Parameters

column (str) – The column name.

Keyword Arguments

mostly (None or a float between 0 and 1) – Return “success”: True if at least mostly fraction of values match the expectation. For more detail, see mostly.

Other Parameters
  • result_format (str or None) – Which output mode to use: BOOLEAN_ONLY, BASIC, COMPLETE, or SUMMARY. For more detail, see result_format.

  • include_config (boolean) – If True, then include the expectation config as part of the result object. For more detail, see include_config.

  • catch_exceptions (boolean or None) – If True, then catch exceptions and include them as part of the result object. For more detail, see catch_exceptions.

  • meta (dict or None) – A JSON-serializable dictionary (nesting allowed) that will be included in the output without modification. For more detail, see meta.

Returns

An ExpectationSuiteValidationResult

Exact fields vary depending on the values passed to result_format and include_config, catch_exceptions, and meta.

library_metadata
map_metric = column_values.unique
success_keys = ['mostly']
default_kwarg_values
validate_configuration(self, configuration: Optional[ExpectationConfiguration])
classmethod _prescriptive_renderer(cls, configuration=None, result=None, language=None, runtime_configuration=None, **kwargs)