0) program.py

import os.path
import json
import util


if __name__ == '__main__':  # Checks if the code is being invoked directly and not as an import
    field_names = ['username', 'first_name', 'last_name', 'email']  # Default Field Names
    field_names_sv = ['användarnamn', 'förnamn', 'efternamn', 'epost']

    # Get if the user wants to load from the target CSV or the cached JSON
    get_from_csv = input("Do you want to load from a CSV or from the cached JSON? [CSV, JSON]: ")
    csv, file = "", ""  # Setups empty defaults for csv and file
    csv_dict = {}  # Setups an empty dict to use
    if get_from_csv.upper() == "CSV":  # Checks if the user wanted to load from the CSV
        csv, file = util.open_csv("./clean.csv", "r+")  # Opens the csv
        for i, row in enumerate(csv):  # Iterate over the rows in the csv
            if i == 0:  # If the row is the header row then continue
                continue  # Skip if it's the head column
            person_dict = {}  # Create an empty dictionary for the user
            for j, name in enumerate(field_names):  # Loops over the field_names
                row_value = row[j]  # Get the value from the CSV
                if row_value is not None:  # If the value isn't empty then add it and its value to the new dict
                    person_dict[name] = row[j]  # Set the fields of the "person_dict"
                    continue  # Continue as to not add double values to the dict
                person_dict[name] = None  # If the value was empty then add an empty field value to the dict
            csv_dict[row[0]] = person_dict  # Set the "person_dict" to the "csv_dict" with the username as key.
        file.close()  # Closes the file reference

    if os.path.exists('./temp.json'):  # Checks if the JSON file already exists
        with open('./temp.json', "r+", encoding='utf-8-sig') as temp:  # Opens the existing temp.json
            csv_dict = json.load(temp)  # Parses the JSON into the csv_dict as a dict object
    else:
        with open('./temp.json', "w+", encoding='utf-8-sig') as temp:  # Opens a new file
            json.dump(csv_dict, temp, indent=True, ensure_ascii=False)  # Dumps the dict to Json

    is_first_run = True
    while True:
        option = -1
        if is_first_run:
            with open('./temp.json', "r+", encoding='utf-8-sig') as temp:
                print(temp.read())
            print()
            is_first_run = False

        while option == -1:
            print("#####################")
            print("# 1 - Add Person    #")
            print("# 2 - Remove Person #")
            print("# 3 - Save File     #")
            print("# 4 - View Person   #")
            print("# 5 - Exit          #")
            print("#####################")
            valueIn = input("Select your prefered option: ")
            while not util.is_integer(valueIn) or not util.is_within(int(valueIn), 1, 4):
                print("Error: Invalid Input, Please enter a number between 1-4")
                valueIn = input("Select your prefered option: ")
            option = int(valueIn)

        if option == 1:
            option = util.addPerson(csv_dict)
            input("Press Any Key to Return to Menu")
        elif option == 2:
            option = util.removePerson(False, csv_dict)
            input("Press Any Key to Return to Menu")
        elif option == 3:
            print("Flushing JSON to CSV")
            option = util.flush_to_csv(csv_dict)
            input("Press Any Key to Return to Menu")
        elif option == 4:
            option = util.get_user_data(csv_dict)
            input("Press Any Key to Return to Menu")
        elif option == 5:
            break
        print()

1) util.py

import csv
import json
import re


def open_csv(path: str, mode: str):
    file = open(path, mode, encoding='utf-8-sig')
    reader = csv.reader(file, delimiter=';')
    return reader, file


def flush_to_csv(csv_dict):
    with open('./temp.json', "w", encoding='utf-8-sig') as clear:  # Clear the json file
        pass
    with open('./temp.json', "r+", encoding='utf-8-sig') as flush:
        json.dump(csv_dict, flush, indent=True, ensure_ascii=False)
    with open('./temp.json', "r+", encoding='utf-8-sig') as saved:
        csv_dict = json.load(saved)
        with open('./labb2_personer_vt22.csv', 'w', newline='') as file:
            writer = csv.writer(file)
            writer.writerow(['användarnamn', 'förnamn', 'efternamn', 'epost'])
            for (key, value) in enumerate(csv_dict.items()):
                nk, nv = value
                writer.writerow([nv['username'], nv['first_name'], nv['last_name'], nv['email']])
    return -1


def addPerson(csv_dict):
    username = input("Please enter a username for the person you want to add: ")
    while not is_regex_compliant(username, r"[hv]\d{2}[a-z]{5}") and username not in csv_dict:
        print("Invalid input: Please provide a valid username matching the following regex format:")
        print(r"[[hv]\d{2}[a-z]{5}] - [Example: h00andan]")
        username = input("Please enter a username for the person you want to add: ")
    first_name = input("Please enter the first name of the user you want to add: ")
    while first_name is None or first_name == "":
        print("Error: Invalid Input - 'First Name' was either of type None or Empty")
        first_name = input("Please enter the first name of the user you want to add: ")
    last_name = input("Please enter the last name of the user you want to add: ")
    while last_name is None or last_name == "":
        print("Error: Invalid Input - 'First Name' was either of type None or Empty")
        last_name = input("Please enter the last name of the user you want to add: ")
    user_dict = {'username': username, 'first_name': first_name,
                 'last_name': last_name, 'email': username + "@du.se"
                }
    csv_dict[username] = user_dict
    return -1


def removePerson(removed, csv_dict):
    while not removed:
        username = input("Please enter the username of the User you want to delete: ")
        if username == "exit":
            return -1
        if username in csv_dict:
            csv_dict.pop(username)
            print(f"Removed user: {username}")
            removed = True
        else:
            print(f"Error: User with Username: {username} , Didn't exist!")


def get_user_data(csv_data):
    username = input("Please enter the username of the user you want to view: ")
    while not is_regex_compliant(username, r"[hv]\d{2}[a-z]{5}"):
        print(r"Invalid Error: Please input a regex compliant username [[hv]\d{2}[a-z]{5}]: ")
        username = input("Please enter the username of the user you want to view: ")
    data = csv_data[username]
    first_name = data['first_name']
    last_name = data['last_name']
    email = data['email']
    print(f"Printing data for user: {username}")
    print(f"Username: {username}")
    print(f"First Name: {first_name}")
    print(f"Last Name: {last_name}")
    print(f"Email: {email}")
    return -1


def is_integer(num):
    try:
        int(num)
        return True
    except ValueError:
        return False


def is_regex_compliant(testable: str, pattern: str):
    if re.match(pattern, testable):
        return True
    return False


def is_within(value, minimum_inclusive, maximum_inclusive):
    if minimum_inclusive <= value <= maximum_inclusive:
        return True
    return False