Exceptions

The following exceptions are defined by GPIO Zero. Please note that multiple inheritance is heavily used in the exception hierarchy to make testing for exceptions easier. For example, to capture any exception generated by GPIO Zero’s code:

from gpiozero import *

led = PWMLED(17)
try:
    led.value = 2
except GPIOZeroError:
    print('A GPIO Zero error occurred')

Since all GPIO Zero’s exceptions descend from GPIOZeroError, this will work. However, certain specific errors have multiple parents. For example, in the case that an out of range value is passed to OutputDevice.value you would expect a ValueError to be raised. In fact, a OutputDeviceBadValue error will be raised. However, note that this descends from both GPIOZeroError (indirectly) and from ValueError so you can still do:

from gpiozero import *

led = PWMLED(17)
try:
    led.value = 2
except ValueError:
    print('Bad value specified')

Errors

exception gpiozero.GPIOZeroError[source]

Base class for all exceptions in GPIO Zero

exception gpiozero.DeviceClosed[source]

Error raised when an operation is attempted on a closed device

exception gpiozero.BadEventHandler[source]

Error raised when an event handler with an incompatible prototype is specified

exception gpiozero.BadQueueLen[source]

Error raised when non-positive queue length is specified

exception gpiozero.BadWaitTime[source]

Error raised when an invalid wait time is specified

exception gpiozero.CompositeDeviceError[source]

Base class for errors specific to the CompositeDevice hierarchy

exception gpiozero.CompositeDeviceBadName[source]

Error raised when a composite device is constructed with a reserved name

exception gpiozero.EnergenieSocketMissing[source]

Error raised when socket number is not specified

exception gpiozero.EnergenieBadSocket[source]

Error raised when an invalid socket number is passed to Energenie

exception gpiozero.SPIError[source]

Base class for errors related to the SPI implementation

exception gpiozero.SPIBadArgs[source]

Error raised when invalid arguments are given while constructing SPIDevice

exception gpiozero.GPIODeviceError[source]

Base class for errors specific to the GPIODevice hierarchy

exception gpiozero.GPIODeviceClosed[source]

Deprecated descendent of DeviceClosed

exception gpiozero.GPIOPinInUse[source]

Error raised when attempting to use a pin already in use by another device

exception gpiozero.GPIOPinMissing[source]

Error raised when a pin number is not specified

exception gpiozero.InputDeviceError[source]

Base class for errors specific to the InputDevice hierarchy

exception gpiozero.OutputDeviceError[source]

Base class for errors specified to the OutputDevice hierarchy

exception gpiozero.OutputDeviceBadValue[source]

Error raised when value is set to an invalid value

exception gpiozero.PinError[source]

Base class for errors related to pin implementations

exception gpiozero.PinInvalidFunction[source]

Error raised when attempting to change the function of a pin to an invalid value

exception gpiozero.PinInvalidState[source]

Error raised when attempting to assign an invalid state to a pin

exception gpiozero.PinInvalidPull[source]

Error raised when attempting to assign an invalid pull-up to a pin

exception gpiozero.PinInvalidEdges[source]

Error raised when attempting to assign an invalid edge detection to a pin

exception gpiozero.PinSetInput[source]

Error raised when attempting to set a read-only pin

exception gpiozero.PinFixedPull[source]

Error raised when attempting to set the pull of a pin with fixed pull-up

exception gpiozero.PinEdgeDetectUnsupported[source]

Error raised when attempting to use edge detection on unsupported pins

exception gpiozero.PinPWMError[source]

Base class for errors related to PWM implementations

exception gpiozero.PinPWMUnsupported[source]

Error raised when attempting to activate PWM on unsupported pins

exception gpiozero.PinPWMFixedValue[source]

Error raised when attempting to initialize PWM on an input pin

exception gpiozero.PinMultiplePins[source]

Error raised when multiple pins support the requested function

exception gpiozero.PinNoPins[source]

Error raised when no pins support the requested function

exception gpiozero.PinUnknownPi[source]

Error raised when gpiozero doesn’t recognize a revision of the Pi

Warnings

exception gpiozero.GPIOZeroWarning[source]

Base class for all warnings in GPIO Zero

exception gpiozero.SPIWarning[source]

Base class for warnings related to the SPI implementation

exception gpiozero.SPISoftwareFallback[source]

Warning raised when falling back to the software implementation