Invalid usage of NewType

Reports invalid usages of NewType.

Examples:

  from typing import NewType

  InvalidName = NewType("Name", int)  # Variable name 'InvalidName' does not match NewType name 'Name'

  from typing import Literal

  InvalidType = NewType("InvalidType", Literal[1])  # NewType cannot be used with 'Literal[1]'

  Base = NewType("Base", str)

  class Derived(Base):  # 'Base' cannot be subclassed
      pass

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

PyNewType

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Python

Inspection ID: PyNewTypeInspection

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection PyNewType

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

Inspection Details
By default bundled with:	CLion 2025.2, DataSpell 2025.2, PyCharm 2025.2,
Can be installed with plugin:	Python Community Edition, 252.26661.0

Last modified: 18 September 2025