Question

This Python assignment will involve implementing a ​bank program that manages bank accounts​ and allows for deposits, withdrawals, and purchases. USE THE PREASSIGNED CODE BELOW:

The program will initially load a list of accounts from a .txt file, and deposits and withdrawals from additional .csv files. Then it will parse and combine all of the data and store it in a dictionary.

Steps

1. Complete the required functions

   1. Implement all of the functions defined in the ​bank_accounts.py

      1. Docstrings have already been provided

      2. You can create any number of helper functions (with docstrings)

      3. The ​main​ function has already been implemented for you

      4. Add ​brief​ comments to all non-trivial lines of code

def init_bank_accounts(accounts, deposits, withdrawals):
'''
Loads the given 3 files, stores the information for individual bank accounts in a dictionary,
and calculates the account balance.

Accounts file contains information about bank accounts.
Each row contains an account number, a first name, and a last name, separated by vertical pipe (|).
Example:
1|Brandon|Krakowsky

Deposits file contains a list of deposits for a given account number.
Each row contains an account number, and a list of deposit amounts, separated by a comma (,).
Example:
1,234.5,6352.89,1,97.60

Withdrawals file contains a list of withdrawals for a given account number.
Each row contains an account number, and a list of withdrawal amounts, separated by a comma (,).
Example:
1,56.3,72.1

Stores all of the account information in a dictionary named 'bank_accounts', where the account number is the key,
and the value is a nested dictionary. The keys in the nested dictionary are first_name, last_name, and balance,
with the corresponding values.
Example:
{'1': {'first_name': 'Brandon', 'last_name': 'Krakowsky', 'balance': 6557.59}}

This function calculates the total balance for each account by taking the total deposit amount
and subtracting the total withdrawal amount.
'''

bank_accounts = {}

#insert code

return bank_accounts

def round_balance(bank_accounts, account_number):
'''Rounds the given account balance.'''

pass

def get_account_info(bank_accounts, account_number):
'''Returns the account information for the given account_number as a dictionary.
Example:
{'first_name': 'Brandon', 'last_name': 'Krakowsky', 'balance': 6557.59}
If the account doesn't exist, returns None.
'''

pass

def withdraw(bank_accounts, account_number, amount):
'''Withdraws the given amount from the account with the given account_number.
Raises a RuntimeError if the given amount is greater than the available balance.
If the account doesn't exist, prints a friendly message.
Rounds and prints the new balance.
'''

pass

def deposit(bank_accounts, account_number, amount):
'''Deposits the given amount into the account with the given account_number.
If the account doesn't exist, prints a friendly message.
Rounds and prints the new balance.
'''

pass

def purchase(bank_accounts, account_number, amounts):
'''Makes a purchase with the total of the given amounts from the account with the given account_number.
Raises a RuntimeError if the total purchase, plus the sales tax (6%), is greater than the available balance.
If the account doesn't exist, prints a friendly message.
Rounds and prints the new balance.
'''

pass

def calculate_sales_tax(amount):
'''Calculates and returns a 6% sales tax for the given amount.'''

pass

def main():

#load and get all account info
bank_accounts = init_bank_accounts('accounts.txt', 'deposits.csv', 'withdrawals.csv')

#for testing
#print(bank_accounts)

while True:

#print welcome and options
print('\nWelcome to the bank! What would you like to do?')
print('1: Get account info')
print('2: Make a deposit')
print('3: Make a withdrawal')
print('4: Make a purchase')
print('0: Leave the bank')

# get user input
option_input = input('\n')

# try to cast to int
try:
option = int(option_input)

# catch ValueError
except ValueError:
print("Invalid option.")

else:

#check options
if (option == 1):

#get account number and print account info
account_number = input('Account number? ')
print(get_account_info(bank_accounts, account_number))

elif (option == 2):

# get account number and amount and make deposit
account_number = input('Account number? ')

# input cast to float
amount = float(input('Amount? '))

deposit(bank_accounts, account_number, amount)

elif (option == 3):

# get account number and amount and make withdrawal
account_number = input('Account number? ')

#input cast to float
amount = float(input('Amount? '))

withdraw(bank_accounts, account_number, amount)

elif (option == 4):

# get account number and amounts and make purchase
account_number = input('Account number? ')
amounts = input('Amounts (as comma separated list)? ')

# convert given amounts to list
amount_list = amounts.split(',')
amount_list = [float(i) for i in amount_list]

purchase(bank_accounts, account_number, amount_list)

elif (option == 0):

# print message and leave the bank
print('Goodbye!')
break

if __name__ == "__main__":
main()

Answer 1

Here is the solution to your question. I tried my best to solve your doubt, however, if you find it is not as good as expected by you. Please do write your further doubts regarding this question in the comment section, I will try to resolve your doubts regarding the submitted solution as soon as possible.

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def init_bank_accounts(accounts, deposits, withdrawals): ''' Loads the given 3 files, stores the information for individual bank accounts in a dictionary, and calculates the account balance. Accounts file contains information about bank accounts. Each row contains an account number, a first name, and a last name, separated by vertical pipe( | ). Example: 1 | Brandon | Krakowsky Deposits file contains a list of deposits for a given account number. Each row contains an account number, and a list of deposit amounts, separated by a comma(, ). Example: 1, 234.5, 6352.89, 1, 97.60 Withdrawals file contains a list of withdrawals for a given account number. Each row contains an account number, and a list of withdrawal amounts, separated by a comma(, ). Example: 1, 56.3, 72.1 Stores all of the account information in a dictionary named 'bank_accounts', where the account number is the key, and the value is a nested dictionary.The keys in the nested dictionary are first_name, last_name, and balance, with the corresponding values. Example: { '1': { 'first_name': 'Brandon', 'last_name': 'Krakowsky', 'balance': 6557.59 } } This function calculates the total balance for each account by taking the total deposit amount and subtracting the total withdrawal amount. ''' bank_accounts = {} #insert code f = open(accounts, "r") for x in f: data=list(x.split(' | ')) # assuming seperated by ' | ' temp={} temp['first_name']=data[1] temp['last_name']=data[2] temp['balance']=0 bank_accounts[data[0]]=temp f.close() f = open(deposits, "r") for x in f: data=list(map(float,x.split(', '))) # assuming seperated by ', ' amount=sum(data[1:]) bank_accounts[str(int(data[0]))]['balance']+=amount f.close() f = open(withdrawals, "r") for x in f: data=list(map(float,x.split(', '))) # assuming seperated by ', ' amount=sum(data[1:]) bank_accounts[str(int(data[0]))]['balance']-=amount round_balance(bank_accounts, str(int(data[0]))) f.close() return bank_accounts def round_balance(bank_accounts, account_number): ''' Rounds the given account balance. ''' bank_accounts[account_number]['balance']=round(bank_accounts[account_number]['balance']) pass def get_account_info(bank_accounts, account_number): ''' Returns the account information for the given account_number as a dictionary. Example: { 'first_name': 'Brandon', 'last_name': 'Krakowsky', 'balance': 6557.59 } If the account doesn 't exist, returns None. ''' if account_number not in bank_accounts: return None else: return bank_accounts[account_number] pass def withdraw(bank_accounts, account_number, amount): ''' Withdraws the given amount from the account with the given account_number. Raises a RuntimeError if the given amount is greater than the available balance. If the account doesn 't exist, prints a friendly message. Rounds and prints the new balance. ''' if account_number not in bank_accounts: print("This account doesn 't exist") else: if bank_accounts[account_number]['balance']<amount: raise RuntimeError("Given amount is greater than the available balance") else: bank_accounts[account_number]['balance']-=amount round_balance(bank_accounts,account_number) print("New Balance is :",bank_accounts[account_number]['balance']) pass def deposit(bank_accounts, account_number, amount): ''' Deposits the given amount into the account with the given account_number. If the account doesn 't exist, prints a friendly message. Rounds and prints the new balance. ''' if account_number not in bank_accounts: print("This account doesn 't exist") else: bank_accounts[account_number]['balance']+=amount round_balance(bank_accounts,account_number) print("New Balance is :",bank_accounts[account_number]['balance']) pass def purchase(bank_accounts, account_number, amounts): ''' Makes a purchase with the total of the given amounts from the account with the given account_number. Raises a RuntimeError if the total purchase, plus the sales tax(6 % ), is greater than the available balance. If the account doesn 't exist, prints a friendly message. Rounds and prints the new balance. ''' if account_number not in bank_accounts: print("This account doesn 't exist") else: amount=sum(amounts) if bank_accounts[account_number]['balance']<(amount+calculate_sales_tax(amount)): raise RuntimeError("Given purchase amount is greater than the available balance") else: bank_accounts[account_number]['balance']-=(amount+calculate_sales_tax(amount)) round_balance(bank_accounts,account_number) print("New Balance is :",bank_accounts[account_number]['balance']) pass def calculate_sales_tax(amount): ''' Calculates and returns a 6% sales tax for the given amount. ''' return amount*0.06; pass def main(): #load and get all account info bank_accounts = init_bank_accounts('accounts.txt', 'deposits.csv', 'withdrawals.csv') #for testing #print(bank_accounts) while True: #print welcome and options print('\nWelcome to the bank! What would you like to do?') print('1: Get account info') print('2: Make a deposit') print('3: Make a withdrawal') print('4: Make a purchase') print('0: Leave the bank') # get user input option_input = input('\n') # try to cast to int try: option = int(option_input) #catch ValueError except ValueError: print("Invalid option.") else : #check options if (option == 1): #get account number and print account info account_number = input('Account number? ') print(get_account_info(bank_accounts, account_number)) elif(option == 2): # get account number and amount and make deposit account_number = input('Account number? ') # input cast to float amount = float(input('Amount? ')) deposit(bank_accounts, account_number, amount) elif(option == 3): # get account number and amount and make withdrawal account_number = input('Account number? ') #input cast to float amount = float(input('Amount? ')) withdraw(bank_accounts, account_number, amount) elif(option == 4): # get account number and amounts and make purchase account_number = input('Account number? ') amounts = input('Amounts (as comma separated list)? ') # convert given amounts to list amount_list = amounts.split(',') amount_list = [float(i) for i in amount_list] purchase(bank_accounts, account_number, amount_list) elif(option == 0): # print message and leave the bank print('Goodbye!') break if __name__ == "__main__": main()