How can I modify the approach to retrieve the account(s) from the list with the highest value (600)?

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You can modify the approach to retrieve the account(s) from the list with the highest value (600) by first finding the maximum value in the list and then iterating over the list to find the account(s) with that maximum value. Here's an example in Python:

account_list = {"account1": 200, "account2": 400, "account3": 600, "account4": 300, "account5": 600}

# Find the maximum value in the list
max_value = max(account_list.values())

# Iterate over the list to find the account(s) with the maximum value
max_accounts = []
for account, value in account_list.items():
    if value == max_value:
        max_accounts.append(account)

print("Accounts with maximum value:", max_accounts)

This code will output: Accounts with maximum value: ['account3', 'account5'].

You can see that the code correctly identifies that both "account3" and "account5" have the highest value in the list, which is 600. The resulting max_accounts list contains both of these account names.