12th August 2021

Coding⚑

Python⚑

Python Snippets⚑

• New: Explain how to find a static file of a python module.

  import pkg_resources
  
  file_path = pkg_resources.resource_filename("my_package", "assets/config.yaml"),
  

• New: Explain how to delete a file.

  import os
  os.remove('demofile.txt')
  

• New: Explain how to measure elapsed time between lines of code.

  import time
  
  start = time.time()
  print("hello")
  end = time.time()
  print(end - start)
  

pexpect⚑

• New: Explain how to read the output of a command run by pexpect.

  import sys
  import pexpect
  child = pexpect.spawn('ls')
  child.logfile = sys.stdout
  child.expect(pexpect.EOF)
  

DevOps⚑

Infrastructure as Code⚑

Terraform⚑

• New: Explain how to ignore the change of an attribute.

  resource "aws_instance" "example" {
    # ...
  
    lifecycle {
      ignore_changes = [
        # Ignore changes to tags, e.g. because a management agent
        # updates these based on some ruleset managed elsewhere.
        tags,
      ]
    }
  }
  

• New: Explain how to define the default value of an variable that contains an object as empty.

  variable "database" {
    type = object({
      size                 = number
      instance_type        = string
      storage_type         = string
      engine               = string
      engine_version       = string
      parameter_group_name = string
      multi_az             = bool
    })
    default     = null
  

• New: Explain how to do a conditional if a variable is not null.

  resource "aws_db_instance" "instance" {
    count                = var.database == null ? 0 : 1
    ...