Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Please help me code this in Python

Create a file named inventory.py .
a. Define a class named Inventory.
a. Define a member function named_init_ to meet the following requirements:
a. Take a self object as a positional parameter.
b. Take a filename string as a keyword parameter.
c. Define a self.data instance variable to hold the dictionary.
d. Open the filename JSON file, if it exists and contains data, assign the JSON deserialized
data (a dictionary) to self.data, otherwise cleanly handle the error.
b. Define a member function named add_item to meet the following requirements:
a. Take a self object as a positional parameter.
b. Take a barcode string as a keyword parameter. Return an integer value of 109 if the value
of the barcode does not meet the required format identified in the dictionary structure
above. Return an integer value of 101 if the barcode already exists in the dictionary.
c. Take a description string as a keyword parameter.
d. Add the item to the dictionary by setting the dictionary key to barcode and the value to the
list made up of the description and the quantity of zero.
e. Write the updated dictionary to the filename provided in the init function.
f. Return an integer value of 100 for a successful add.
c. Define a member function named modify_description to meet the following requirements:
a. Take a self object as a positional parameter.
b. Take a barcode string as a keyword parameter. Return an integer value of 102 if the
barcode does not exist in the dictionary.
c. Take a description string as a keyword parameter.
d. Update the item in the dictionary by setting the dictionary key to barcode and the value to
the list made up of the description and the existing quantity (i.e the quantity should not
change).
e. Write the updated dictionary to the filename provided in the init_ function.
f. Return an integer value of 100 for a successful add.
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Transcribed Image Text:Create a file named inventory.py . a. Define a class named Inventory. a. Define a member function named_init_ to meet the following requirements: a. Take a self object as a positional parameter. b. Take a filename string as a keyword parameter. c. Define a self.data instance variable to hold the dictionary. d. Open the filename JSON file, if it exists and contains data, assign the JSON deserialized data (a dictionary) to self.data, otherwise cleanly handle the error. b. Define a member function named add_item to meet the following requirements: a. Take a self object as a positional parameter. b. Take a barcode string as a keyword parameter. Return an integer value of 109 if the value of the barcode does not meet the required format identified in the dictionary structure above. Return an integer value of 101 if the barcode already exists in the dictionary. c. Take a description string as a keyword parameter. d. Add the item to the dictionary by setting the dictionary key to barcode and the value to the list made up of the description and the quantity of zero. e. Write the updated dictionary to the filename provided in the init function. f. Return an integer value of 100 for a successful add. c. Define a member function named modify_description to meet the following requirements: a. Take a self object as a positional parameter. b. Take a barcode string as a keyword parameter. Return an integer value of 102 if the barcode does not exist in the dictionary. c. Take a description string as a keyword parameter. d. Update the item in the dictionary by setting the dictionary key to barcode and the value to the list made up of the description and the existing quantity (i.e the quantity should not change). e. Write the updated dictionary to the filename provided in the init_ function. f. Return an integer value of 100 for a successful add.
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