text: """Common pipetting command base models."""
  from pydantic import BaseModel, Field
  
  from ..types import WellLocation
  
  
  class BasePipettingRequest(BaseModel):
      """Base class for pipetting requests that interact with wells."""
  
      pipetteId: str = Field(
          ...,
          description="Identifier of pipette to use for liquid handling.",
      )
      labwareId: str = Field(
          ...,
          description="Identifier of labware to use.",
      )
      wellName: str = Field(
          ...,
          description="Name of well to use in labware.",
      )
  
  
  class BaseLiquidHandlingRequest(BasePipettingRequest):
      """Base class for liquid handling requests."""
  
      volume: float = Field(
          ...,
          description="Amount of liquid in uL. Must be greater than 0 and less "
                      "than a pipette-specific maximum volume.",
          gt=0,
      )
      wellLocation: WellLocation = Field(
          ...,
          description="Relative well location at which to perform the operation",
      )
  
      # todo(mm, 2021-03-26): This class or one of its subclasses should have a
      # field for liquid flow rate in microliters per second.
      # See Opentrons/opentrons#4837 for terminology concerns.
  
  
  class BaseLiquidHandlingResult(BaseModel):
      """Base properties of a liquid handling result."""
  
      volume: float = Field(
          ...,
          description="Amount of liquid in uL handled in the operation.",
          gt=0,
      )
  