khuonghieu/python-practice

Problem #1: The Basics/ String/ Dictionary

Given

A string as the following:

I completed {number_of_sessions} sessions and I rated my expert {number_of_stars} stars

while:

• number_of_sessions is any number in [1, 2, ...9]

• number_of_stars is any text in [one, two, three, four, five]

Then

• Convert number_of_sessions from number to text.

• Convert number_of_stars from text to number.

• Using dictionaries and string methods.

Expected output

For example, with number_of_sessions = 2 and number_of_stars = five, the original string will be:

I completed 2 sessions and I rated my expert five stars

The result after conversion:

I completed two sessions and I rated my expert 5 stars

Problem #2: Object-Oriented Programming/ Exceptions

Given

• Existing code from Problem #1.

Then

• Create a class Step contains:

  • Instance variables:

    • number_of_sessions: int

    • number_of_stars: int

  • Methods:

    • __init__(number_of_sessions: int, number_of_stars: string)

    • make_step(self)

• Move your code logic into the method make_step.

  Then you should be able to call your method as Step(2, 'five').make_step().

--

• In module enums, create a model entities Session, it should contain all of your constants as its class variables.

• The constants should be accessible via enums.Session.

  Remember update your make_step to use the enums you just defined.

  # enums.py
  class Session(object):
      NUMBER_TO_TEXT_MAP: dict
  
  # other.py
  from enums import Session
  Session.NUMBER_TO_TEXT_MAP

--

• Create an exeption called InvalidValueException:

  • Instance variables:

    • message: string

  • Methods:

    • __init__(message: string)

• Create an exception InvalidValueException extends from Exception.

  Then you can raise the exception as the following: raise InvalidValueException("Invalid number of sessions").

--

• When Step be created with invalid number_of_session or number_of_stars, it should raise an InvalidValueException exception with the corresponding message.

  Try to catch and print out the message using try, except.

Expected output

• Step, Session and Exception should have their own modules.

• Expected result:

  Step(2, "five").make_step()
  # > I completed two sessions and I rated my expert 5 stars

  Step(0, "five").make_step()
  # > Invalid number of sessions

  Step(2, "ten").make_step()
  # > Invalid number of stars

Problem #3: Advanced Data Types

Given

A list, a tuple and a set of numbers:

a = [1, 2, 3, 4, 5, 6, 7, 8]
b = (3, 4, 1, 2, 7, 6, 5, 8)
c = {5, 6, 7, 8, 1, 2, 3, 4}

Then

• Decide if a, b, c all contain the same set of numbers.

Expected output

The result should be true.

Problem #4: Files/ JSON/ Dictionary/ Algorithm

Given

A file data.json with the following content:

{
  "expiration_time": 300,
  "id": 0,
  "product": "xchat",
  "storefront": {
      "banner_enabled": true,
      "banner_text": "Dynamic offer banner",
      "description": "",
      "enabled": true,
      "purchase_options": [
          {
              "button_text": "Dynamic offer - button_text",
              "description": "Dynamic offer - description",
              "id": "",
              "price": "7.99",
              "price_text": "price_text",
              "session_count": "3",
              "subtitle": "Dynamic offer - subtitle",
              "title": "Dynamic offer - title",
              "suffix": "Dynamic offer - suffix",
              "trial_duration": 0,
              "min_member_count": 1,
              "max_member_count": 1,
              "action": "purchase",
              "frequency_view": "monthly",
              "free_learning_subscription": false,
              "team_type": "personal",
              "frequency": null,
          }
      ],
  },
  "utm_campaign": "19203420349",
  "utm_source": "",
}

An object modify_data with the following content:

modify_data = {
  "expiration_time": 200,
  "product": "qchat",
  "utm_campaign": str(time.time()),
  "storefront": {
    "banner_enabled": False,
    "purchase_options": [
          {
              "button_text": "Dynamic offer 1 - button_text",
              "description": "Dynamic offer 1 - description",
              "id": "",
              "price": "99.99",
              "price_text": "price_text",
              "session_count": "0",
              "subtitle": "Dynamic offer - subtitle",
              "title": "Dynamic offer - title",
              "suffix": "Dynamic offer - suffix",
              "trial_duration": 0,
              "min_member_count": 1,
              "max_member_count": 1,
              "action": "purchase",
              "frequency_view": "monthly",
              "free_learning_subscription": False,
              "team_type": "personal",
              "frequency": None,
          }
      ]
  }
}

Then

• Create class model entities StorefrontConfig:

  • Methods:

    • __init__(data: object)

    • update(modify_data: object): Write an algorithm to update data of the object using the dictionary provided (not using direct variable assignment).

• Create class FileController:

  • Static Methods:

    • read_file(file_name: string): StorefrontConfig: To read a json with name file_name, it should return a StorefrontConfig object with the data in the text file.

    • write_file(object: StorefrontConfig, file_name: string): To write the StorefrontConfig object down to file file_name as text.

• The result should be written to file result.json.

Expected output

file_controller = FileController()
config = file_controller.read_file("data.json")
config.update(modify_data)
file_controller.write_file(config, "result.json")

A new file result.json should be created with the following content:

{
    "expiration_time": 200,
    "id": 0,
    "product": "qchat",
    "storefront": {
        "banner_enabled": false,
        "banner_text": "Dynamic offer banner",
        "description": "",
        "enabled": true,
        "purchase_options": [
            {
                "button_text": "Dynamic offer 1 - button_text",
                "description": "Dynamic offer 1 - description",
                "id": "",
                "price": "99.99",
                "price_text": "price_text",
                "session_count": "0",
                "subtitle": "Dynamic offer - subtitle",
                "title": "Dynamic offer - title",
                "suffix": "Dynamic offer - suffix",
                "trial_duration": 0,
                "min_member_count": 1,
                "max_member_count": 1,
                "action": "purchase",
                "frequency_view": "monthly",
                "free_learning_subscription": false,
                "team_type": "personal",
                "frequency": null
            }
        ]
    },
    "utm_campaign": "updated_timestamp",
    "utm_source": ""
}