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Summary: This document provides basic information about the extension providing Python support.

Extension ID


What's new?

Please see Python 1.4 - Release Notes for more information


This extension provides support for Python.

In what situation should you install this extension?

If your application contains Python source code (both .py and .jy extensions are supported) and you want to view these object types and their links with other objects, then you should install this extension.

Files analyzed

IconsFileExtensionNote, Python files - standard extension.

Jython.jyBy convention, Python files to be run in a Java implementation of the Python interpreter.
-YAML (YAML Ain't Markup Language)*.yml, *.yaml, Files related to the YAML language, commonly used for configuration purposes. Necessary to interpret Amazon Web Services deployment code.

Supported Python versions

The following table displays the supported versions matrix:


Function Point, Quality and Sizing support

This extension provides the following support:

  • Function Points (transactions): a green tick indicates that OMG Function Point counting and Transaction Risk Index are supported
  • Quality and Sizing: a green tick indicates that CAST can measure size and that a minimum set of Quality Rules exist
Function Points
Quality and SizingSecurity

AIP Core compatibility

This extension is compatible with:

CAST AIP release

Supported DBMS servers

This extension is compatible with the following DBMS servers:



CSS / PostgreSQL(tick)


(tick)An installation of any compatible release of AIP Core (see table above)

Framework support

Web Service Frameworks
(client-side requests and/or server-side operations)



Dependencies with other extensions

  • Web Services Linker (internal technical extension)
  • CAST AIP Internal extension (internal technical extension)
Note that when using the CAST Extension Downloader to download the extension and the Manage Extensions interface in CAST Server Manager to install the extension, any dependent extensions are automatically downloaded and installed for you. You do not need to do anything.

Download and installation instructions

The extension will be automatically downloaded and installed in AIP Console when you deliver Python code. You can also manually install the extension using the Application - Extensions interface. When installed, follow the instructions below to run a new analysis/snapshot to generate new results:

Source code discovery

A discoverer is provided with the extension to automatically detect Python code: a Python project will be discovered for the package's root folder when at least one .py or .jy (jython) file is detected in the root folder or any sub-folders. For every Python project located, one Universal Technology Analysis Unit will be created:

Analysis - Automatic skipping of unit-test code and external libraries

The analyzer skips files that are recognized as forming part of testing code, i.e., in principle, code not pertaining to production code. The reason to avoid inclusion of testing code is that many Quality Rule violations are overrepresented in test code, either because code tends to be of poorer quality (certainly not critical) or prevalence of particular testing patterns. Accounting for test code would negatively impact the total score of the project.

Similarly we skip folders that contain external python libraries. Currently we only skip the canonical folders site-packages and dist-packages (the latter being used in certain Linux distributions). Not only analyzing external libraries is discouraged, but it can interfere with correct interpretation of supported libraries and frameworks, and have a serious impact in memory consumption and overall analysis performance.

The heuristics used by the analyzer are based on detecting (unit-test) library imports, and file and path naming conventions as summarized in the table below: 










FileContentimport unittest12
FileContentfrom unittest import12
FileContentfrom import12






  • The ** symbol represents any arbitrary path string, whereas * represents any string without directory slashes.
  • The heuristics above should also similarly valid for .jy (jython) files.
  • FilePath match is case-insensitive

What results can you expect?

Once the analysis/snapshot generation has completed, you can view the results in the normal manner:

Python Class and method example

iOS Front-end connected to a Python Flask Back-end.


The following specific objects are displayed in CAST Enlighten:


Python Project, Python External Library

Python Module

Python Class
Python Method
Python Script

Python GET (urllib, urllib2, httplib, httplib2, aiohttp) service
Python GET service request
Python (Flask, aiohttp) Web Service GET operation
Python Web Service Get Operation

Python POST (urllib, urllib2, httplib, httplib2, aiohttpservice
Python POST service request
Python (Flask, aiohttp) Web Service POST operation
Python Web Service Post Operation

Python PUT (urllib, urllib2, httplib, httplib2, aiohttpservice
Python PUT service request
Python (Flask, aiohttp) Web Service PUT operation
Python Web Service Post Operation

Python DELETE (urllib, urllib2, httplib, httplib2, aiohttpservice
Python DELETE service request
Python Flask, aiohttp Web Service DELETE operation
Python Web Service Delete Operation

Python Web Service Any Operation

Python Query, Python ORM Mapping, Python File Query

RabbitMQ Python QueueCall
ActiveMQ Python QueueCall
IBM MQ Python QueueCall

RabbitMQ Python QueueReceive
ActiveMQ Python QueueReceive
IBM MQ Python QueueReceive

Python Call To Java Program

Python Call To Generic Program
Amazon Web Services

Python Call to AWS Lambda Function

Python Call to Unknown AWS Lambda Function

Python AWS Lambda GET Operation

Python AWS Lambda POST Operation
Python AWS Lambda PUT Operation
Python AWS Lambda DELETE Operation

Python AWS Lambda ANY Operation

Python AWS SQS Publisher, Python AWS SNS Publisher

Python AWS SQS Receiver, Python AWS SNS Receiver

Python AWS SQS Unknown Publisher, Python AWS SNS Unknown Publisher

Python AWS SQS Unknown Receiver, Python AWS SNS Unknown Receiver

Python S3 Bucket

Python Unknown S3 Bucket

Python DynamoDB Database

Python DynamoDB Table

Python Unknown DynamoDB Table

Python Email, Python SMS

Python callable artifact

Python Script, Python Module and Python Method objects form part of Python (callable) artifacts.

The following links are created:

  • call links between methods
  • inherit link between hierarchically related classes
  • refer link from methods to class (constructor call)
  • use link between modules through import
  • call links between Python callable artifacts and Python Call objects
  • call links between Python Call objects and external programs or lambda functions

The following links are created between Python ORM Mapping objects and database table objects:

  • useSelectLink in case of SELECT operation
  • useDeleteLink in case of DELETE operation
  • useInsertLink in case of INSERT operation
  • useUpdateLink in case of UPDATE operation
  • call links in case of generic operation on S3 buckets

Structural Rules

The following structural rules are provided:

You can also find a global list here:||

Expected results for supported frameworks

Refer the following pages for the results that you can expect for each supported framework:


  • Not fully supported Python Decorator function.
  • Quality rules do not apply to code inside the class definition (class or "static" variables)
  • The "Avoid disabling certificate check when requesting secured urls" for 'urllib3' is only partially supported by detecting the call to 'urllib3.disable_warnings'.
  • Limited Python resolution that leads to missing links:
    • No support for __all__
    • No support for variable of type class, function
  • Flask:
    • Objects for other web service operations such as PATCH are not generated.
    • The endpoint abstraction layer between functions and annotations is not considered. When using  add_url_rule the endpoint argument is taken as the calling function name.
  • Cherrypy:
    • Only support default request.dispatcher "cherrypy.dispatch.MethodDispatcher()".

  • Django framework is not supported.
  • Java-Python interoperability via Jython is not supported. However the files with the specific extension .jy for Jython is analyzed as a regular Python file.
  • Message queues
    •  To generate queue message objects the queue name has to be initialized explicitly in the code (dynamic naming not supported).
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