Week-5 Assignment Solution (Last Date : 05/03/2020)
The library at the Hogwarts School of Witchcraft and Wizardry has computerized its book issuing process. The relevant information is provided as text from standard input in three parts: information about books, information about borrowers and information about checkouts. Each part has a specific line format, described below.
- Information about books
Line format: Accession Number~Title - Information about borrowers
Line format: Username~Full Name - Information about checkouts
Line format: Username~Accession Number~Due Date
Note: Due Date is in YYYY-MM-DD format.
You may assume that the data is internally consistent. For every checkout, there is a corresponding username and accession number in the input data, and no book is simultaneously checked out by two people.
Each section of the input starts with a line containing a single keyword. The first section begins with a line containing Books. The second section begins with a line containing Borrowers. The third section begins with a line containing Checkouts. The end of the input is marked by a line containing EndOfInput.
Write a Python program to read the data as described above and print out details about books that have been checked out. Each line should describe to one currently issued book in the following format:
Due Date~Full Name~Accession Number~Title
Your output should be sorted in increasing order of due date. For books due on the same date, sort in increasing order of full name. If the due date and full name are both the same, sort based on the accession number, and, finally, the title of the book.
Here is a sample input and its corresponding output.
Sample Input
Books APM-001~Advanced Potion-Making GWG-001~Gadding With Ghouls APM-002~Advanced Potion-Making DMT-001~Defensive Magical Theory DMT-003~Defensive Magical Theory GWG-002~Gadding With Ghouls DMT-002~Defensive Magical Theory Borrowers SLY2301~Hannah Abbott SLY2302~Euan Abercrombie SLY2303~Stewart Ackerley SLY2304~Bertram Aubrey SLY2305~Avery SLY2306~Malcolm Baddock SLY2307~Marcus Belby SLY2308~Katie Bell SLY2309~Sirius Orion Black Checkouts SLY2304~DMT-002~2019-03-27 SLY2301~GWG-001~2019-03-27 SLY2308~APM-002~2019-03-14 SLY2303~DMT-001~2019-04-03 SLY2301~GWG-002~2019-04-03 EndOfInput
Sample Output
2019-03-14~Katie Bell~APM-002~Advanced Potion-Making 2019-03-27~Bertram Aubrey~DMT-002~Defensive Magical Theory 2019-03-27~Hannah Abbott~GWG-001~Gadding With Ghouls 2019-04-03~Hannah Abbott~GWG-002~Gadding With Ghouls 2019-04-03~Stewart Ackerley~DMT-001~Defensive Magical Theory
Solution:
# Dictionary to map accession number to title
books = {}
# Dictionary to map username to fullname
borrowers = {}
# List to store checkout data: accumulate, sort and print
checkouts = []
# Find the start of Books data
nextline = input().strip()
while nextline.find("Books") < 0:
nextline = input().strip()
# Read upto start of Borrowers data
# Skip the line with "Books"
nextline = input().strip()
while nextline.find("Borrowers") < 0:
(accession_number,title) = nextline.split('~')
books[accession_number] = title
nextline = input().strip()
# Read upto Checkout data
# Skip the line with "Borrowers"
nextline = input().strip()
while nextline.find("Checkouts") < 0:
(username,fullname) = nextline.split('~')
borrowers[username] = fullname
nextline = input().strip()
# Process Checkouts
# Skip the line with "Checkouts"
nextline = input().strip()
while nextline.find("EndOfInput") < 0:
(username,accession_number,due_date) = nextline.split('~')
checkoutline = due_date+"~"+borrowers[username]+"~"+accession_number+"~"+books[accession_number]
checkouts.append(checkoutline)
nextline = input().strip()
# Print the output from checkouts
for checkoutline in sorted(checkouts):
print(checkoutline)
