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import warnings
class NullCalculationWarning(RuntimeWarning): # pragma: no cover
"""
Warning raised if a calculation which can not logically
account for null values is performed on a :class:`.Column` containing
nulls.
"""
pass
def warn_null_calculation(operation, column):
warnings.warn('Column "{}" contains nulls. These will be excluded from {} calculation.'.format(
column.name,
operation.__class__.__name__
), NullCalculationWarning, stacklevel=2)
class DuplicateColumnWarning(RuntimeWarning): # pragma: no cover
"""
Warning raised if multiple columns with the same name are added to a new
:class:`.Table`.
"""
pass
def warn_duplicate_column(column_name, column_rename):
warnings.warn('Column name "{}" already exists in Table. Column will be renamed to "{}".'.format(
column_name,
column_rename
), DuplicateColumnWarning, stacklevel=2)
class UnnamedColumnWarning(RuntimeWarning): # pragma: no cover
"""
Warning raised when a column has no name and an a programmatically generated
name is used.
"""
pass
def warn_unnamed_column(column_id, new_column_name):
warnings.warn('Column %i has no name. Using "%s".' % (
column_id,
new_column_name
), UnnamedColumnWarning, stacklevel=2)
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