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Define a context class
======================
The [ArContext](../../argaze.md/#argaze.ArFeatures.ArContext) class defines a generic class interface to handle pipeline inputs according to [Python context manager feature](https://docs.python.org/3/reference/datamodel.html#context-managers).
# Write Python context file
A specific [ArContext](../../argaze.md/#argaze.ArFeatures.ArContext) can be defined into a Python file.
Here is an example context defined into *my_context.py* file:
```python
from argaze import ArFeatures, DataFeatures
class Example(ArFeatures.ArContext):
@DataFeatures.PipelineStepInit
def __init__(self, **kwargs):
# Init ArContext class
super().__init__()
# Init private attribute
self.__parameter = ...
@property
def parameter(self):
"""Any required parameter."""
return self.__parameter
@parameter.setter
def parameter(self, parameter):
self.__parameter = parameter
@DataFeatures.PipelineStepEnter
def __enter__(self):
# Start context according any required parameter
... self.parameter
# Assuming that timestamp, x and y values are available
...
# Process timestamped gaze position
self._process_gaze_position(timestamp = timestamp, x = x, y = y)
return self
@DataFeatures.PipelineStepExit
def __exit__(self, exception_type, exception_value, exception_traceback):
# End context
...
```
!!! note ""
The next chapter explains how to [load a context to connect it with a pipeline](configuration_and_connection.md).
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