Interview questions

Salt grain module

Create a salt execution module that returns data on all disk present on a device similar to the following:

'device': '/dev/sda', 
'major-device': '8', 
'blocks': '125034840', 
'minor-device': '0'

Check out https://docs.saltstack.com/en/latest/topics/grains/#writing-grains for the docs and http://pyholodeck.readthedocs.io/en/latest/first_module.html for an example

Rest Cli

Create a simple cli to pull data from a 3rd party rest api (you may use any you like, but in this example I will be using https://jsonplaceholder.typicode.com/)

Example cli usage:

kellen@Chewbacca:~$ python rest.py --help                                                                                                                                                                                
usage: Get some data from https://jsonplaceholder.typicode.com/
       [-h] {list,get} ...

positional arguments:
  {list,get}
    list      List some posts
    get       Get a specific post

optional arguments:
  -h, --help  show this help message and exit
kellen@Chewbacca:~$ python rest.py list --help                                                                                                                                                                           
usage: Get some data from https://jsonplaceholder.typicode.com/ list
       [-h] [-n NUMBER]

optional arguments:
  -h, --help            show this help message and exit
  -n NUMBER, --number NUMBER
                        List N Posts
kellen@Chewbacca:~$ python rest.py list -n 1
{
    "body": "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto", 
    "id": 1, 
    "title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit", 
    "userId": 1
}
kellen@Chewbacca:~$ python rest.py get --help
usage: Get some data from https://jsonplaceholder.typicode.com/ get
       [-h] [-c] id

positional arguments:
  id              Get post <id>

optional arguments:
  -h, --help      show this help message and exit
  -c, --comments  Include comments
kellen@Chewbacca:~$ python rest.py get 1
{
    "body": "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto", 
    "id": 1, 
    "title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit", 
    "userId": 1
}
kellen@Chewbacca~$ python rest.py get -c 1                                                                                                                                                                              
{
    "body": "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto", 
    "comments": [
        {
            "body": "laudantium enim quasi est quidem magnam voluptate ipsam eos\ntempora quo necessitatibus\ndolor quam autem quasi\nreiciendis et nam sapiente accusantium", 
            "email": "Eliseo@gardner.biz", 
            "id": 1, 
            "name": "id labore ex et quam laborum", 
            "postId": 1
        }, 
        {
            "body": "est natus enim nihil est dolore omnis voluptatem numquam\net omnis occaecati quod ullam at\nvoluptatem error expedita pariatur\nnihil sint nostrum voluptatem reiciendis et", 
            "email": "Jayne_Kuhic@sydney.com", 
            "id": 2, 
            "name": "quo vero reiciendis velit similique earum", 
            "postId": 1
        }, 
        {
            "body": "quia molestiae reprehenderit quasi aspernatur\naut expedita occaecati aliquam eveniet laudantium\nomnis quibusdam delectus saepe quia accusamus maiores nam est\ncum et ducimus et vero voluptates excepturi deleniti rati
one", 
            "email": "Nikita@garfield.biz", 
            "id": 3, 
            "name": "odio adipisci rerum aut animi", 
            "postId": 1
        }, 
        {
            "body": "non et atque\noccaecati deserunt quas accusantium unde odit nobis qui voluptatem\nquia voluptas consequuntur itaque dolor\net qui rerum deleniti ut occaecati", 
            "email": "Lew@alysha.tv", 
            "id": 4, 
            "name": "alias odio sit", 
            "postId": 1
        }, 
        {
            "body": "harum non quasi et ratione\ntempore iure ex voluptates in ratione\nharum architecto fugit inventore cupiditate\nvoluptates magni quo et", 
            "email": "Hayden@althea.biz", 
            "id": 5, 
            "name": "vero eaque aliquid doloribus et culpa", 
            "postId": 1
        }
    ], 
    "id": 1, 
    "title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit", 
    "userId": 1
}

cache-debugging-problem

A simple python debugging problem for interviews

Goals

1. All unittests in python debug.py should pass
2. You should only need to modify cache.py
3. Execution time of python debug.py should be less than a second