(scimath)bash-3.2$ flake8 scimath | grep F821
scimath/physical_quantities/dimensions.py:139:23: F821 undefined name 'TraitsError'
scimath/physical_quantities/dimensions.py:140:15: F821 undefined name 'TraitsError'
scimath/physical_quantities/units.py:107:19: F821 undefined name 'QuantityTypeError'
scimath/physical_quantities/units.py:125:19: F821 undefined name 'QuantityTypeError'
scimath/physical_quantities/units.py:137:19: F821 undefined name 'QuantityTypeError'
scimath/physical_quantities/units.py:154:20: F821 undefined name 'Quantity'
scimath/physical_quantities/units.py:160:20: F821 undefined name 'Quantity'
scimath/physical_quantities/units.py:166:20: F821 undefined name 'Quantity'
scimath/physical_quantities/units.py:203:43: F821 undefined name 'dict_add'
scimath/physical_quantities/units.py:211:44: F821 undefined name 'dict_sub'
scimath/physical_quantities/units.py:219:43: F821 undefined name 'dict_mul'
scimath/physical_quantities/units.py:244:16: F821 undefined name 'format_expansion'
scimath/physical_quantities/units.py:246:51: F821 undefined name 'unicode_power'
scimath/physical_quantities/units.py:250:16: F821 undefined name 'format_expansion'
scimath/physical_quantities/units.py:255:15: F821 undefined name 'dimensionless'
scimath/units/quantity.py:137:32: F821 undefined name 'em'
scimath/units/unit_db.py:126:48: F821 undefined name 'column_names'
scimath/units/unit_db.py:172:59: F821 undefined name 'converters'
scimath/units/unit_db.py:221:35: F821 undefined name 'system_names'
scimath/units/unit_manager.py:225:34: F821 undefined name 'us'
scimath/units/unit_manager.py:482:33: F821 undefined name 'numpy'
