Testing

Assertion functions

testing.assert_frame_equal(left, right[, ...])	Check that left and right DataFrame are equal.
testing.assert_series_equal(left, right[, ...])	Check that left and right Series are equal.
testing.assert_index_equal(left, right[, ...])	Check that left and right Index are equal.
testing.assert_extension_array_equal(left, right)	Check that left and right ExtensionArrays are equal.

Exceptions and warnings

errors.AbstractMethodError(class_instance[, ...])	Raise this error instead of NotImplementedError for abstract methods.
errors.AccessorRegistrationWarning	Warning for attribute conflicts in accessor registration.
errors.AttributeConflictWarning	Warning raised when index attributes conflict when using HDFStore.
errors.CategoricalConversionWarning	Warning is raised when reading a partial labeled Stata file using a iterator.
errors.ClosedFileError	Exception is raised when trying to perform an operation on a closed HDFStore file.
errors.CSSWarning	Warning is raised when converting css styling fails.
errors.DatabaseError	Error is raised when executing sql with bad syntax or sql that throws an error.
errors.DataError	Exceptionn raised when performing an operation on non-numerical data.
errors.DtypeWarning	Warning raised when reading different dtypes in a column from a file.
errors.DuplicateLabelError	Error raised when an operation would introduce duplicate labels.
errors.EmptyDataError	Exception raised in pd.read_csv when empty data or header is encountered.
errors.IncompatibilityWarning	Warning raised when trying to use where criteria on an incompatible HDF5 file.
errors.IndexingError	Exception is raised when trying to index and there is a mismatch in dimensions.
errors.InvalidColumnName	Warning raised by to_stata the column contains a non-valid stata name.
errors.InvalidComparison	Exception is raised by _validate_comparison_value to indicate an invalid comparison.
errors.InvalidIndexError	Exception raised when attempting to use an invalid index key.
errors.InvalidVersion	An invalid version was found, users should refer to PEP 440.
errors.IntCastingNaNError	Exception raised when converting (astype) an array with NaN to an integer type.
errors.LossySetitemError	Raised when trying to do a __setitem__ on an np.ndarray that is not lossless.
errors.MergeError	Exception raised when merging data.
errors.NoBufferPresent	Exception is raised in _get_data_buffer to signal that there is no requested buffer.
errors.NullFrequencyError	Exception raised when a freq cannot be null.
errors.NumbaUtilError	Error raised for unsupported Numba engine routines.
errors.NumExprClobberingError	Exception raised when trying to use a built-in numexpr name as a variable name.
errors.OptionError	Exception raised for pandas.options.
errors.OutOfBoundsDatetime	Raised when the datetime is outside the range that can be represented.
errors.OutOfBoundsTimedelta	Raised when encountering a timedelta value that cannot be represented.
errors.ParserError	Exception that is raised by an error encountered in parsing file contents.
errors.ParserWarning	Warning raised when reading a file that doesn't use the default 'c' parser.
errors.PerformanceWarning	Warning raised when there is a possible performance impact.
errors.PossibleDataLossError	Exception raised when trying to open a HDFStore file when already opened.
errors.PossiblePrecisionLoss	Warning raised by to_stata on a column with a value outside or equal to int64.
errors.PyperclipException	Exception raised when clipboard functionality is unsupported.
errors.PyperclipWindowsException(message)	Exception raised when clipboard functionality is unsupported by Windows.
errors.SettingWithCopyError	Exception raised when trying to set on a copied slice from a DataFrame.
errors.SettingWithCopyWarning	Warning raised when trying to set on a copied slice from a DataFrame.
errors.SpecificationError	Exception raised by agg when the functions are ill-specified.
errors.UndefinedVariableError(name[, is_local])	Exception raised by query or eval when using an undefined variable name.
errors.UnsortedIndexError	Error raised when slicing a MultiIndex which has not been lexsorted.
errors.UnsupportedFunctionCall	Exception raised when attempting to call a unsupported numpy function.
errors.ValueLabelTypeMismatch	Warning raised by to_stata on a category column that contains non-string values.

Bug report function

show_versions([as_json])

Provide useful information, important for bug reports.

Test suite runner

test([extra_args])

Run the pandas test suite using pytest.