Update {{cookiecutter.postprocessor_name}}.py

Author: joeycasey87

{{cookiecutter.project_name}}/{{cookiecutter.project_slug}}/{{cookiecutter.postprocessor_name}}.py

@@ -6,7 +6,42 @@
 in this module and other relevant information.
 """
 
-def {{cookiecutter.postprocessor_name }}_xxx(**kwargs):
+# Function {{ cookiecutter.postprocessor_name }}_xxx to create postprocess plugins named xxx.
+
+# IMPORTANT: The name of the postprocessor should follow the "postprocessor_name"
+# naming convention. The "postprocessor_" prefix to the postprocessor name is MANDATORY since it is
+# used by the pysteps interface.
+#
+# Check the pysteps documentation for examples of postprocessors names that follow this
+# convention:
+# https://pysteps.readthedocs.io/en/latest/pysteps_reference/io.html#available-postprocessors
+#
+# The function prototype for the postprocessor's declaration should have the following form:
+#
+#  def postprocess_xxx(filename, keyword1="some_keyword", keyword2=10, **kwargs):
+#
+#
+# Function arguments
+# ~~~~~~~~~~~~~~~~~~
+#
+# The function arguments should have the following form:
+# (filename, keyword1="some_keyword", keyword2=10,...,keywordN="something", **kwargs)
+# The `filename` and `**kwargs` arguments are mandatory to comply with the pysteps
+# interface. To fine-control the behavior of the postprocessor, additional keywords can be
+# added to the function.
+# For example: keyword1="some_keyword", keyword2=10, ..., keywordN="something"
+# It is recommended to declare the keywords explicitly in the function to improve the
+# readability.
+#
+#
+# Return arguments
+# ~~~~~~~~~~~~~~~~
+#
+# The postprocessor should always return the following fields:
+#
+#
+
+def {{cookiecutter.postprocessor_name}}_xxx(filename, **kwargs):
   """
   A detailed description of the postprocessor. A minimal documentation is
   strictly needed since the pysteps postprocessors interface expect docstrings.
@@ -17,15 +52,32 @@ def {{cookiecutter.postprocessor_name }}_xxx(**kwargs):
   Grib format.
 
   Parameters
-  ----------
-  parameter1: str
-    description
-    
+    ----------
+    filename : str
+        Name of the file to be processed.
+
+    keyword1 : str
+        Some keyword used to fine control the postprocessor behavior.
+
+    keyword2 : int
+        Another keyword used to fine control the postprocessor behavior.
+
+    {extra_kwargs_doc}
+
+    ####################################################################################
+    # The {extra_kwargs_doc} above is needed to add default keywords added to this     #
+    # postprocessor by the pysteps.decorator.postprocess_postprocess decorator.        #
+    # IMPORTANT: Remove these box in the final version of this function                #
+    ####################################################################################
   Returns
   -------
-  output: array
-    description    
+  filename: file
+    The file having been processed.
   """
+  ####################################################################################
+  # Add the code required to run the postprocessor here.
+  file = open(filename, "w")
+  file.write("hello world")
+  file.close()
+  return file
 
-  output = "hello world"
-  return output