ATTENTION: The tests will only be added after the exam. Currently, it is only tested whether your code compiles.

The state bond issue in the summer of 2023 was a huge success. In total, 22.3 billion euros were subscribed to the state bond. Subscribing for the state bond could be done both through one’s own bank and through a secure government website. The following assignment contains a number of backend functions necessary to make this site work.

Global Variables - 1 point

• Define a global variable register. The object linked to this variable refers to a Dictionary and will be used to store the subscriptions of individuals:
  • key: national registration number
  • value: list of amount, date of subscription, account number
• Define a global variable iban_overheid and assign it the value BE11 1234 1234 1234.
• Define a variable bic_overheid and assign it the value “FGTHGI”.

Subscribing to State Bond - 2 points

Define a function subscribe_to_state_bond with parameters an amount, a national registration number, and the account number on which the amount + interest should be repaid. The function will register the subscription in the register variable if:

• the amount is higher than 0 EUR. If this is not the case, the following message is displayed, and the function returns false:

  ERROR: [amount] must be higher than 0.

• the amount is a multiple of 100. If this is not the case, the following message is displayed, and the function returns false:

  ERROR: [amount] is not a multiple of 100.

• there is no existing subscription with the national registration number. If this is not the case, the following message is displayed, and the function returns false:

  ERROR: a subscription has already been made using the national registration number

If all conditions are met, the subscription is registered in the register, and the function returns True.

Querying Subscribed Amount - 1 point

Define a function queried_amount with as parameter a national registration number. The function returns the amount for which was subscribed by the given national registration number. If no subscription is found, the method returns 0.

Payment Invitation - 2 points

After a subscription, a payment invitation is sent via email. The text of this email is composed by the function payment_invitation. This method has as a parameter a national registration number and returns the following text:

The amount must be on our account by 01/09/2023 at the latest.
    
    IBAN: [IBAN_overheid] (BIC: [BIC_overheid])
    in the name of the Department of the Ledgers, Kunstlaan 30, 1040 Brussels.
    Amount: [amount] EUR
    with the communication: Purchase of State Bond [national registration number]

You can assume for this function that a subscription for the given national registration number has been added.

Total Subscribed Amount - 1 point

Define the function total_subscribed. This function returns the total amount that has been subscribed to date.

Writing Register to CSV - 2 points

Define a method register_to_csv with parameters a filename and a delimiter with the default value “;”. This method will write the Dictionary linked to the register variable to a CSV file:

national registration number;amount;timestamp;account number
78.06.28-111.64;1000000;2023-09-05 10:14:29.056256;BE98 1111 1111 1111
55.04.23-456.64;20000;2023-09-05 10:14:29.056535;BE77 2222 2222 2222
07.05.12-678.11;2000;2023-09-05 10:14:29.056537;BE78 3333 3333 3333

Main Method - 1 point

Add a main method that tests the various functions. Ensure that a minimum of three subscriptions have been added, the payment invitation of one of the subscriptions is displayed in the console, and the total of the subscriptions is displayed.

Tips:

• for determining the current date and time, you can use the datetime module
• whenever possible, always reuse previously defined methods by calling these methods.