def table_from_csv(self, file_name='CSV_Data\packages.csv'):
'''
Loads data from csv file into package_table.
Creates package based on CSV data and inserts that package into hash table
Space-time complexity = O(N)
'''
# Opens & reads from csv file
with open(file_name) as csv_file:
reader = csv.reader(csv_file, delimiter=',')
# Loop through each row in file, create package based on it's information
for row in reader:
# Retrieves & sets package attributes
package = Package(int(row[0]))
package.address_id = row[1]
package.address = row[2]
package.city = row[3]
package.state = row[4]
package.zip_code = row[5]
package.deadline = row[6]
package.weight = row[7]
package.instructions = row[8]
# Inserts package
self.insert_package(package)
def create_new_package():
'''
Prompts user for new package attributes and creates a package based on them.
The method will also dynamically assign package & address ID to the package.
If there is room in the hash table, the package is then inserted into it.
If there is no room in the hash table, a bucket is created for the package to be inserted.
Space-time complexity = O(N)
'''
global receiveing
package_id = -1
address_id = -1
# Find empty bucket in Hash Table and sets it's index to package id
# This is valid because we are using a direct hash table
for i in range(len(receiveing.package_table)):
if type(receiveing.package_table[i]) != Package:
package_id = i
break
# If no empty bucket was found, then hash table full.
# Append an empty bucket to the hash table and make it's index the package id
if package_id == -1:
receiveing.package_table.append(None)
package_id = len(receiveing.package_table) - 1
# Prompts user to enter package details.
print("Please enter package details below.\n")
address = input("Address: ")
city = input("City: ")
state = input("State: ")
zip_code = input("Zip: ")
weight = input("Weight: ")
deadline = input("Deadline: ")
instructions = input("Instructions: ")
# Checks if address already exists in hash table.
# If yes, set address_id to matching address_id.
# If no, create a new address_id not already usedl
if receiveing.lookup_packages('address', address):
address_id = receiveing.lookup_packages('address', address)[0].address_id
else:
address_id = receiveing.num_addresses
# Create package with attributes entered by user
package = Package(package_id)
package.address_id = address_id
package.address = address
package.city = city
package.state = state
package.zip_code = zip_code
package.weight = weight
package.deadline = deadline
package.instructions = instructions
# Inserts package into hash table
receiveing.insert_package(package)
