Programming in Python.. Stuck on this program

Question

I have to write a program to process a file of many bank transactions. The data file we have to use with the program goes like this: The first line of the file indicates the number of bank accounts. If the first line is ‘x’ – then the next ‘x*2’ lines are pairs of data containing: • bank account number • current balance I have to create a bank account object and put them in a list. Following these lines are an unknown number of "sets" of data for transactions. Each transaction consists of: transaction type (W,D,T or B) account number(s) amount The sentinel value is a transaction type of "#". This is what my code looks like so far:

class BankAccount:
 def __init__(self, inputNum, inputAmount):
 self.__acctNum = inputNum
 self.__balance = inputAmount
 self.__numDeposits = 0
 self.__totalDeposits = 0
 self.__numWithdrawals = 0
 self.__totalWithdrawals = 0
 def getAcctNum(self):
 return self.__acctNum
 def getBalance(self):
 return self.__balance
 def getNumDeposits(self):
 return self.__numDeposits
 def getNumWithdrawals(self):
 return self.__numWithdrawals
 def getTotalDeposits(self):
 return self.__totalDeposits
 def getTotalWithdrawals(self):
 return self.__totalWithdrawals
 def Deposit(self,amount):
 self.__balance = self.__balance + amount
 self.__numDeposits = self.__numDeposits + 1
 self.__totalDeposits = self.__totalDeposits + amount
 def Withdrawal(self,amount):
 if (self.__balance >= amount):
 self.__balance = self.__balance - amount
 self.__numWithdrawals = self.__numWithdrawals + 1
 self.__totalWithdrawals = self.__totalWithdrawals + amount
 return True
 else:
 return False
def main():
 list1 = []
 num = eval(input())
 for i in range(num):
 account = input()
 amount = eval(input())
 bankAccount = BankAccount(account,amount)
 list1.append(bankAccount)
 print(list1[i].getBalance())
 while(type != '#'):
 if(type == 'D'):
 account.deposit(amount)
 elif(type == 'W'):
 elif(type == 'T'):
 elif(type == 'B'):

First question: Do list1 and num = eval(input()) go before the main function, or is it good like it is? Second question: Where would type = eval(input()) go? I'm guessing it would go right after the list1 and num? Also, if you could give me some suggestions or tips on how to finish this program, I'd really appreciate it!

• dansalmo: Don't give your money to any bank that allows user input to be eval()'ed. :)
• Ashwini Chaudhary: use float() instead of eval

Answer 1

Unlike C, java, C# etc there is actually no strict need for the main function. You can actually remove the entire main function block and write it as plain lines of instructions.

If you really want to have the main function but also run the program as a script you can use in the end:

if __name__ == "__main__":
 main()

So the answer to your 1st question is: Anyway you like