5. calculate_new_balance Given a starting balance (a number), and a list of transaction tuples, calculate the final balance for an account. Transaction tuples are of the shape ("description", amount, "withdrawal") , or ("description", amount, "deposit"). The last entry in the tuple will be either "withdrawal" or "deposit". Every withdrawal decreases the balance of the account by the specified amount, and every deposit increases the balance. The return value is the new account balance, as a number. (which could be negative)

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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5. calculate_new_balance
Given a starting balance (a number), and a list of
transaction tuples, calculate the final balance for an
account. Transaction tuples are of the shape
("description", amount, "withdrawal") , or ("description",
amount, "deposit"). The last entry in the tuple will be
either "withdrawal" or "deposit". Every withdrawal
decreases the balance of the account by the specified
amount, and every deposit increases the balance. The
return value is the new account balance, as a number.
(which could be negative)
Sample calls should look like:
>>> calculate_new_balance(100, [("payday", 20,
"deposit"), ("new shoes", 50, "withdrawal"),
("illicit winnings", 200, "deposit")])
270
>>> calculate_new_balance (100, [])
100
Transcribed Image Text:5. calculate_new_balance Given a starting balance (a number), and a list of transaction tuples, calculate the final balance for an account. Transaction tuples are of the shape ("description", amount, "withdrawal") , or ("description", amount, "deposit"). The last entry in the tuple will be either "withdrawal" or "deposit". Every withdrawal decreases the balance of the account by the specified amount, and every deposit increases the balance. The return value is the new account balance, as a number. (which could be negative) Sample calls should look like: >>> calculate_new_balance(100, [("payday", 20, "deposit"), ("new shoes", 50, "withdrawal"), ("illicit winnings", 200, "deposit")]) 270 >>> calculate_new_balance (100, []) 100
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