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Python Code Samples -

This readme file is specifically for the Python code sample.

The setup instructions are the same as all other python code samples in this repository. This file is provided as additional/supplemental information for this specific code sample.

Please see the main page for general instructions.

Usage instructions are shown at the bottom of this page.

Code Sample Details

A quick intro, first. The code sample shows a basic demo of REST API interactions with Python 3. There is no provision for environments of a specific size as all API requests will be made with the default parameters. For example:

  • A maximum of 20 entities are returned with each request
  • No offset has been specified i.e. every request will return VMs starting 0-19

In large environments this information is not overly useful. has been provided with a number of additional capabilities and "architecture" choices:

  • Clusters with >500 VMs will be identified.

  • A single request will be made if the cluster has <=500 VMs i.e. VM 0-499.

  • Additional requests will be made for VMs 500-n (where n is the total number of VMs in the cluster).

  • The API request "work" has been broken out into a dedicated RESTClient class that exposes a public send_request method.

  • The RESTClient class constructor accepts an array of parameters so that a single instance of the RESTClient class can be reused.

  • The send_request method returns an instance of RequestResponse.

  • RequestResponse contains public properties for a response code, message, details and json, making it easy to see what the request result was in the event of a caught exception.

  • The send_request method will be called as many times as necessary so that all VMs are captured. For example:

    • A cluster with 1407 VMs will have the send_request method called three times.
    • The first request will returns VMs 0-499 (500 VMs).
    • The second request will return VMs 500-999 (500 VMs).
    • The third and final request will return VMs 1000-406 (407 VMs).
  • A final prompt ensures the script doesn't "flash" before the user can view the output.

While this demo is considerably more "advanced" than the standard demo, please still make sure to modify the code appropriately before you use it in production.

An example of the script's output is shown below:



usage: [-h] json

positional arguments:
  json        JSON file containing query parameters

optional arguments:
  -h, --help  show this help message and exit


/usr/bin/python3.7 ./ list_vm_v3_large.json
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