In the file containing the process, there must be one class with the name
Process, which is instance of
Each process must contain at least two methods:
Process initialization: __init__ method¶
This method is the constructor for the actual process. It has to invoke the
pywps.Process.WPSProcess.__init__() method of the superior WPSProcess class with process configuration options, described in
pywps.Process.WPSProcess in more detail.
The process can then define several
pywps.Process.InAndOutputs.Output instances. Several methods can be used
for this, namely
pywps.Process.WPSProcess.addBBoxInput() for inputs and
pywps.Process.WPSProcess.addBBoxOutput() for outputs.
Process execution: execute method¶
pywps.Process.WPSProcess.execute() method, which is originally
empty, is called by PyWPS for process execution.
The actual calculation is to be done here. When the process
returns any text, it is handled as an error message. When a process is successfully
calculated, this method returns None.
Example of PyWPS process¶
After adding “returner” string to __all__ array, in the
__init__.py file in the PyWPS Processes directory, we can try
GetCapabilities, DescribeProcess and Execute requests.