What is the new alglist and alghelp in QGIS 3.0 Processing?

Question

Accessing the new QGIS 3.0 processing scripts through the Python console is proving to be a challenge for me, especially since the old processing.alglist() and processing.alghelp() commands appear to be defunct.

• How does one call up a list of processing scripts?
• How does one call up the help info for an individual script?

Answer 1

• How does one call up a list of processing scripts?

  QgsApplication.processingRegistry().algorithms()
  

  If you want to print a readable list of algorithm ids and names, you can do this:

  for alg in QgsApplication.processingRegistry().algorithms():
      print("{}:{} --> {}".format(alg.provider().name(), alg.name(), alg.displayName()))
  

• How does one call up the help info for an individual script?

  processing.algorithmHelp("qgis:refactorfields")
  

See https://qgis.org/api/api_break.html#qgis_api_break_3_0_Processing for details and recommendations from QGIS developers.