A folder named 'Project' having two subfolders 'proj' and 'test' inside it The 'proj' folder contains an empty ' init py' file and also an empty ' init py' inside the 'test' folder In inventory py' file, Define a child class 'InsufficientException' derived from 'Exception' as follows py class InsufficientException(Exception) pass Define a class 'MobileInventory' with the following specifications Define the class method ' init ', which initializes an instance of 'MobileInventory' and accepts an input through the argument 'inventory' , and assigns the value to the attribute 'balance inventory' By default, the 'inventory' argument's value is 'None' If no input value is passed to the argument 'inventory' , the attribute 'balance inventory' is set to an empty dictionary The input value passed to the argument 'inventory' must be a dictionary If the input is not a dictionary, raise a TypeError Exception with the message Input inventory must be a dictionary Keys of the dictionary must be a string, representing mobile model names If the given key is not a string, raise ValueError with the message Mobile model name must be a string Values of the dictionary must be positive integers, representing the number of available handsets corresponding to various mobile models If the given value is not a positive integer, raise ValueError with the message No of mobiles must be a positive integer A sample input dictionary can be 'iPhone Model X' 100, 'Xiaomi Model Y' 1000, 'Nokia Model Z' 25 Define the class method 'add stock' , which adds new stock of mobiles to existing inventory It accepts an input through the argument new stock , and updates the 'balance inventory' based on the input new stock The input value passed to 'new stock' argument must be a dictionary If the input is not a dictionary, raise a TypeError Exception with the message Input stock must be a dictionary Keys of the dictionary must be a string, representing mobile model names If the given key is not a string, raise a ValueError with the message Mobile model name must be a string Values of the dictionary must be positive integers, representing the number of available handsets corresponding to various mobile models If the given value is not a positive integer, raise a ValueError with the message No of mobiles must be a positive integer Define the class method 'sell stock' , which sells the request mobile handsets to customers It accepts an input through the argument requested stock , and updates the 'balance inventory' attribute based on the input requested stock The input value passed to the 'requested stock' argument must be a dictionary If the input is not a dictionary, raise a TypeError Exception with the message Requested stock must be a dictionary Keys of the dictionary must be a string, representing mobile model names If the given key is not a string, raise ValueError with the message Mobile model name must be a string Values of the dictionary must be positive integers, representing the number of available handsets corresponding to various mobile models If the given value is not a positive integer, raise a ValueError with the message No of mobiles must be a positive integer Before selling, check if the requested mobile handset model is part of the existing inventory If not, raise an InsufficientException with the error message No Stock New Model Request If the requested number of mobile handsets are not available in the inventory, raise an InsufficientException with the error message Insufficient Stock Ensure you are in the 'Project' folder Open the 'test test inventory py' file Import MobileInventory class and InsufficientException from the inventory module using the expression from proj inventory import MobileInventory, InsufficientException Import pytest using the expression import pytest Define a pytest test class 'TestingInventoryCreation' which tests the behavior of the ' init ' method with the following tests Define a pytest test method 'test creating empty inventory' , which creates an empty inventory and checks if its 'balance inventory' is an empty dict Define a pytest test method 'test creating specified inventory' , which creates an inventory instance with input 'iPhone Model X' 100, 'Xiaomi Model Y' 1000, 'Nokia Model Z' 25 Define a pytest test method 'test creating inventory with list' , which checks if the ' init ' method raises a TypeError with the message Input inventory must be a dictionary when a list 'iPhone Model X', 'Xiaomi Model Y', 'Nokia Model Z' is passed as input Define a pytest test method 'test creating inventory with numeric keys' , which checks if the ' init ' method raises a ValueError with the message Mobile model name must be a string , when the dict 1 'iPhone Model X', 2 'Xiaomi Model Y', 3 'Nokia Model Z' is passed as input Define a pytest test method 'test creating inventory with nonnumeric values' , which checks if the ' init ' method raises a ValueError with the message No of mobiles must be a positive integer when the dict 'iPhone Model X' '100', 'Xiaomi Model Y' '1000', 'Nokia Model Z' '25' is passed as input Define a pytest test method 'test creating inventory with negative value' , which checks if the ' init ' method raises a ValueError with the message No of mobiles must be a positive integer when the dict 'iPhone Model X' 45, 'Xiaomi Model Y' 200, 'Nokia Model Z' 25 is passed as input

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A folder named 'Project' having two subfolders 'proj' and 'test' inside it. The 'proj' folder contains an empty ' init .py' file and also an

A folder named 'Project' having two subfolders 'proj' and 'test' inside it. The 'proj' folder contains an empty 'init.py' file and also an empty 'init.py' inside the 'test' folder.In inventory.py' file,

Define a child class'InsufficientException'derived from'Exception'as follows:py
class InsufficientException(Exception):
pass
Define a class'MobileInventory'with the following specifications:
Define the class method '__init__', which initializes an instance of'MobileInventory'and accepts an input through the argument'inventory', and assigns the value to the attribute'balance_inventory'.
By default, the'inventory'argument's value is 'None'. If no input value is passed to the argument'inventory', the attribute'balance_inventory'is set to an empty dictionary-{}.
The input value passed to the argument'inventory'must be a dictionary. If the input is not a dictionary, raise a TypeError Exception with the message "Input inventory must be a dictionary".
Keys of the dictionary must be a string, representing mobile model names. If the given key is not a string, raise ValueError with the message "Mobile model name must be a string".
Values of the dictionary must be positive integers, representing the number of available handsets corresponding to various mobile models. If the given value is not a positive integer, raise ValueError with the message "No. of mobiles must be a positive integer".
A sample input dictionary can be {'iPhone Model X':100, 'Xiaomi Model Y': 1000, 'Nokia Model Z':25}.
Define the class method'add_stock', which adds new stock of mobiles to existing inventory. It accepts an input through the argumentnew_stock, and updates the 'balance_inventory'. based on the inputnew_stock.
The input value passed to'new_stock'argument must be a dictionary. If the input is not a dictionary, raise a TypeError Exception with the message "Input stock must be a dictionary".
Keys of the dictionary must be a string, representing mobile model names. If the given key is not a string, raise a ValueError with the message "Mobile model name must be a string".
Values of the dictionary must be positive integers, representing the number of available handsets corresponding to various mobile models. If the given value is not a positive integer, raise a ValueError with the message "No. of mobiles must be a positive integer".
Define the class method'sell_stock', which sells the request mobile handsets to customers. It accepts an input through the argumentrequested_stock, and updates the 'balance_inventory' attribute based on the inputrequested_stock.
The input value passed to the'requested_stock'argument must be a dictionary. If the input is not a dictionary, raise a TypeError Exception with the message "Requested stock must be a dictionary".
Keys of the dictionary must be a string, representing mobile model names. If the given key is not a string, raise ValueError with the message "Mobile model name must be a string".
Values of the dictionary must be positive integers, representing the number of available handsets corresponding to various mobile models. If the given value is not a positive integer, raise a ValueError with the message "No. of mobiles must be a positive integer".
Before selling, check if the requested mobile handset model is part of the existing inventory. If not, raise an InsufficientException with the error message "No Stock. New Model Request".
If the requested number of mobile handsets are not available in the inventory, raise an InsufficientException with the error message "Insufficient Stock".

Ensure you are in the 'Project' folder.
Open the 'test/test_inventory.py' file.
ImportMobileInventoryclass andInsufficientExceptionfrom theinventorymodule using the expressionfrom proj.inventory import MobileInventory, InsufficientException.
Importpytestusing the expressionimport pytest.
Define a pytest test class'TestingInventoryCreation'which tests the behavior of the'__init__'method with the following tests:
Define a pytest test method'test_creating_empty_inventory', which creates an empty inventory and checks if its 'balance_inventory' is an empty dict.
Define a pytest test method'test_creating_specified_inventory', which creates an inventory instance with input {'iPhone Model X':100, 'Xiaomi Model Y': 1000, 'Nokia Model Z':25}.
Define a pytest test method'test_creating_inventory_with_list', which checks if the'__init__'method raises a TypeError with the message "Input inventory must be a dictionary" when a list "['iPhone Model X', 'Xiaomi Model Y', 'Nokia Model Z']" is passed as input.
Define a pytest test method'test_creating_inventory_with_numeric_keys', which checks if the'__init__'method raises a ValueError with the message "Mobile model name must be a string", when the dict {1:'iPhone Model X', 2:'Xiaomi Model Y', 3:'Nokia Model Z'} is passed as input.
Define a pytest test method'test_creating_inventory_with_nonnumeric_values', which checks if the'__init__'method raises a ValueError with the message "No. of mobiles must be a positive integer" when the dict {'iPhone Model X':'100', 'Xiaomi Model Y': '1000', 'Nokia Model Z':'25'} is passed as input.
Define a pytest test method'test_creating_inventory_with_negative_value', which checks if the'__init__'method raises a ValueError with the message "No. of mobiles must be a positive integer" when the dict {'iPhone Model X':-45, 'Xiaomi Model Y': 200, 'Nokia Model Z':25} is passed as input.