Re: Simple account program
Igorati wrote: ah thank you again. Anyone know of a good place to get information about TK inter. I am gonna try and make this program somewhat of a GUI. Thank you again. http://docs.python.org/lib/module-Tkinter.html http://www.pythonware.com/library/tkinter/introduction/index.htm http://infohost.nmt.edu/tcc/help/pubs/tkinter/ Kent -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple account program
ah thank you again. Anyone know of a good place to get information about TK inter. I am gonna try and make this program somewhat of a GUI. Thank you again. -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple account program
You probably want:
import pickle
pickle.dump(myAccount, file("account.pickle", "w"))
To reload your account:
import pickle
myAccount = pickle.load(file("account.pickle"))
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Re: Simple account program
Igorati wrote:
pickle.dump ((withdrawl), file ('account.pickle', 'w'))
^
Is this banking done with an American accent? :-)
pickle.dump ((deposit), file ('account.pickle', 'w'))
Am I on the right track?
The file you create in the second statement is going
to overwrite the first one. If you want to append
data to an existing file, you need to open it in
'a' mode.
--
Greg Ewing, Computer Science Dept,
University of Canterbury,
Christchurch, New Zealand
http://www.cosc.canterbury.ac.nz/~greg
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Re: Simple account program
Question then, do I do an
import pickle
pickle.dump ((withdrawl), file ('account.pickle', 'w'))
pickle.dump ((deposit), file ('account.pickle', 'w'))
Am I on the right track?
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Re: Simple account program
I was looking at both the programs and I got Dennis Lee Bieber's code to work, then I tried the imporvements from Chris Reberts code but was unable to get it to run. It said EOL error. I took out got and tried to move it around but it didn't take. I took the else code at the end so that other keys cannot be entered. I also see at the begining you are defining what a deposit and withdrawl is. Ironically our next assignment is to make this program handle errors and try to implement a GUI. I'm going to use the GUI feauture and see what I come up with. Thank you all for your help. I know I will be coding proper some day in the future. -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple account program
Since everyone's improving the program, I thought I'd just tweak Dennis
Lee Bieber's code a little. Here's the result. Good luck Ignorati!
import time
class Transaction(object):
def __init__(self, payee, amount, date=None):
# amount is the amt withdrawn/deposited
self.payee = payee
self.amount = amount
if date is None:
date = time.localtime()
self.date = date
def formatEntry(self):
if self.amount > 0:
transType = "DEPOSIT"
elif self.amount < 0:
transType = "WITHDRAWAL"
return transType+"\t\t%s\t%s\t%s" % ((self.date[0],
self.date[1],
self.date[2]),
self.amount,
self.payee)
class Account(object):
def __init__(self, acctName, initialBalance):
self.acctName = accName
self.transacts = [Transaction("Initial Balance",
initialBalance)]
self.balance = initialBalance
def deposit(self, payee, amt, date=None):
assert amt >= 0, "amt must be positive for a deposit, got
"+str(amt)
self.transacts.append(Transaction(payee, amt, date))
self.balance += amt
def withdraw(self, payee, amt, date=None):
assert amt <= 0, "amt must be negative for a withdrawl, got
"+str(amt)
self.transacts.append(Transaction(payee, amt, date))
self.balance -= amt
def printRegister(self):
print "Transaction\tDate\t\tAmount\tPayee"
for t in self.transacts:
print t.formatEntry()
if __name__ == "__main__":
myAccount = Account("Sample Account", 0.0)
while True:
print """
Select transaction type:
D)eposit
W)ithdrawal
P)rint register
Q)uit
"""
rep = raw_input("Enter your choice => ")
rep = rep[0].upper()
if rep == "D" or rep == "W":
who = raw_input("Enter payee name => ")
amt = float(raw_input("Enter transaction amount => "))
if rep == "D":
myAccount.deposit(who, amt)
else:
myAccount.withdraw(who, amt)
elif rep == "P":
print "\n"
myAccount.printRegister()
print "\n"
elif rep == "Q":
break
else:
print "Invalid Input, Please Try Again"
print
print "\tCurrent Balance: %s\n" % myAccount.balance
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Re: Simple account program
Igorati wrote: > Thank you all for your help. I am sorry that I am struggling with > programming. I still am attempting to "get it". Yes, I do need to stop > posting homework assignments, perhaps I will learn to write code through > more studying. I have gone through some toutorials if that makes you feel > any better. I do have a desire to learn. Thank you again. I will go back > and attempt to impliment this. Igorati, A desire to learn , persistant study, and excercise is all you really need ;) I don't know how much you 'get' yet so I will assume you are just starting. We all have problems gaining that 'flash of insight' sometimes that makes it all clear ( I am still trying to fully grasp metaclasses and secretly envy Alex Martelli and just about every other genius on this list ;). So the best way I can tell you to learn a language is to read and write it. -Open a Python interpreter and start keying in Python and see what happens. -If you don't know what an interpreter is read the tutor http://docs.python.org/tut/node4.html -Use dir() to see what an object exposes to you. -Learn about list, dictionary, tuple and string methods it will save you months. -Buy a book on Python. I found it easier to grasp from a book than the net, and now I have reference I can give to friends to get them started. -Read thru the standard library when you have the basics down the insight you will gain is priceless. -Pick a module and learn it. write a program that uses that module in some way( this will make it easier to spot the time you actually need to write a solution) -Find a program you like and start adding 'features' to it or taking out 'features' you don't like. -Python tutor list may be more appropriate for you right now till you are up and running. http://www.python.org/mailman/listinfo/tutor -Just keep reading and writing Python , you will 'get it'. hth, M.E.Farmer -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple account program
Thank you all for your help. I am sorry that I am struggling with programming. I still am attempting to "get it". Yes, I do need to stop posting homework assignments, perhaps I will learn to write code through more studying. I have gone through some toutorials if that makes you feel any better. I do have a desire to learn. Thank you again. I will go back and attempt to impliment this. -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple account program
wes weston schrieb:
>Why have transactions not associated with accounts?
> All transactions are related to an account; have
> a self.TransActList in Account.
>You have "amount" in both Withdrawl and Deposit
> both derived from Transaction. If Transactions always
> have an amount, why not put amount in the transactions
> class?
That's a good idea. I don't know if Igorati is just doing an
exercise or has the ambition to create a usable application.
In the latter case it would be a good idea to learn the basics
of double accounting (DA). In DA each transaction is associated
with 2 accounts.
DA tries to avoid signed numbers, but uses the terms debit and
credit instead. debit and credit aren't simply synonyms for minus
and plus because there are two types of accounts: assets and
liabilities. Liabilities have a minus sign built in.
For me this is crazy and I used to confuse things until I found
three rules to memorize this:
1. Positive flow of money is always recorded on the debit side.
2. Assets account balances are computed without sign change.
3. Liability account balances are computed with sign change.
In matrix form:
debit credit
assets accont+ -
liabil account - +
Example: You empty your piggybank to pay your debts:
Amount is recorded on the debit side of debts and on the credit
side of piggybank (rule 1). Both balances are lower, because credit
is negative for assets (rule 2) and debit is negative for liabilities
(rule 3).
So the easiest way to handle this programmatically is to have two
lists, accounts and transactions. Each transaction generates a new
entry in the list of transactions:
translist.append(trans(credit_account, debit_account, amount))
where amount is always positive. The account class has a balance
method:
class account:
def balance(self, translist):
bal = 0
for e in translist:
if self == e.debit_account:
bal += e.amount
if self == e.credit_account:
bal -= e.amount
if self.acctype == "liability":
bal = -bal
return bal
--
---
Peter Maas, M+R Infosysteme, D-52070 Aachen, Tel +49-241-93878-0
E-mail 'cGV0ZXIubWFhc0BtcGx1c3IuZGU=\n'.decode('base64')
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Re: Simple account program
Igorati wrote:
Hello all, I am still needing some help on this code, I have gone a bit
further on it. Thank you for the help. I am trying to understand how to
make the file searchable and how I am to make the deposit and withdrawl
interact with the transaction class.
I need to just search the file only for the deposits and withdrawls and
the amount in the account with a time stamp. Thank you for your
assistance.
class Account:
def __init__(self, initial):
self.balance = initial
def deposit(self, amt):
self.balance = self.balance + amt
def withdraw(self, amt):
self.balance = self.balance - amt
def getbalance(self):
return self.balance
class Transactoin:
def transaction(self,
self.transaction =
import time
time.asctime()
raw_input("Is this a deposit or withdrawl?")
if withdrawl:
elif
raw_input("Please enter amount here.")
class Deposit(Transaction):
def deposit(self, amt):
self.balance = self.balance + amt
def getbalance(self):
return self.balance
class Withdrawl(Trasaction):
def withdrawl(self, amt):
self.balance = self.balance - amt
def getbalance(self):
return self.balance
import pickle
pickle.dump ((withdrawl), file ('account.pickle', 'w'))
pickle.dump ((deposit), file ('account.pickle', 'w'))
print "Your current account total is.", self.balance
Igorati,
Suggestion. Write out what you want to do in
words such that all the things you want to do are
there as unambiguously clear as you can get it.
It will help your thinking on the problem, the
design, and the code; and help anyone trying to
help you.
Why have transactions not associated with accounts?
All transactions are related to an account; have
a self.TransActList in Account.
You have "amount" in both Withdrawl and Deposit
both derived from Transaction. If Transactions always
have an amount, why not put amount in the transactions
class? But we don't know.
wes
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Re: Simple account program
The indentation got messed up a bit, it should look like this. class Transaction: def __init__(self): self.name = '' self.amount = 0.0 self.type = '' class Account: def __init__(self, name=''): self.name = name self.ledger = [] def newtransaction(self, name, amount, type): transaction = Transaction() # Create transaction instance. transaction.name = name transaction.amount = amount transaction.type = '' self.ledger.append(transaction) def getbalance(self): balance = 0.0 for transaction in self.ledger: balance += transaction.amount return balance # Within your main program somewhere. # Create an instance of the account object. myaccount = Account( 'Savings Account') # get transaction data from user or file name = 'cash' amount = 20.0 type = 'deposite' myaccount.newtransaction( name, amount, type) print "%s Balance is $ %.2f" % (myaccount.name, myaccount.getbalance()) -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple account program
Igorati wrote: Hello all, I am still needing some help on this code, I have gone a bit further on it. Thank you for the help. I am trying to understand how to make the file searchable and how I am to make the deposit and withdrawl interact with the transaction class. I need to just search the file only for the deposits and withdrawls and the amount in the account with a time stamp. Thank you for your assistance. Hi Igorati, In a ledger program I wrote, I setup the account classes something like below. I'm not sure what you mean by searching a file. Are you trying to read an already existing file? class Transaction: def __init__(self): self.name = '' self.amount = 0.0 self.type = '' class Account: def __init__(self, name=''): self.name = name self.ledger = [] def newtransaction(self, name, amount, type): transaction = Transaction() transaction.name = name transaction.amount = amount transaction.type = '' self.ledger.append(transaction) def getbalance(self): balance = 0.0 for transaction in self.ledger: balance += transaction.amount return balance # Within your main program somewhere. myaccount = Account( 'Savings Account') # get transaction data from user or file name = 'cash' amount = 20.0 type = 'deposite' myaccount.newtransaction( name, amount, type) print "%s Balance is $ %.2f" % (myaccount.name, myaccount.getbalance()) -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple account program
Igorati,
I wished I could give you a simple fix, BUT...
You need to really re-read the docs and do some tutors first .
Your understanding of classes and namespaces is flawed and will not
become clear without futher study.
search strategy:
python namespaces
python class
python tutor
Classes are like containers.
Classes have there own namespace, "self".
Multiple classes do not share namespaces.
Stay away from inheritance till you have an understanding of namespace,
no need in getting mixed up.
Withdrawl, Deposit, Transaction should be members of the account class.
That way they can share a namespace and simplify your design.
Why do you need to search a pickle?
Pickle an instance of the class and unpickle it when needed and your
data will be however it was in your instance.
If you have real code post it because this code does not work and never
will.
Quit posting homework, you can ask for occasional help, but this is the
third time i have seen this, it is getting worse and you have been
warned before ;)
Surely in the month since you first asked you could have read a bit of
documentation.
# this is not complete or even tested it is just an example ( based on
your code )
import time
class Account:
def __init__(self, initial):
self.balance = initial
self.history = {}
def deposit(self, amt):
self.balance = self.balance + amt
self.save('deposit',amt)
def withdraw(self, amt):
self.balance = self.balance - amt
self.save('withdrawl', amt)
def getbalance(self):
return self.balance
def gethistory(self):
return self.history
def save(self,trans,amount):
# store the transaction type, amount, balance
self.history[self.timestamp()] = (trans,amount,self.balance)
def timestamp(self):
return time.asctime()
def transaction(self):
withdrawl = raw_input("Is this a deposit or withdrawl?")
amount = raw_input("Please enter amount here.")
if withdrawl.lower() in ["withdrawl","w"]:
self.withdraw(amount)
else:
self.deposit(amount)
hth,
M.E.Farmer
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Simple account program
Hello all, I am still needing some help on this code, I have gone a bit
further on it. Thank you for the help. I am trying to understand how to
make the file searchable and how I am to make the deposit and withdrawl
interact with the transaction class.
I need to just search the file only for the deposits and withdrawls and
the amount in the account with a time stamp. Thank you for your
assistance.
class Account:
def __init__(self, initial):
self.balance = initial
def deposit(self, amt):
self.balance = self.balance + amt
def withdraw(self, amt):
self.balance = self.balance - amt
def getbalance(self):
return self.balance
class Transactoin:
def transaction(self,
self.transaction =
import time
time.asctime()
raw_input("Is this a deposit or withdrawl?")
if withdrawl:
elif
raw_input("Please enter amount here.")
class Deposit(Transaction):
def deposit(self, amt):
self.balance = self.balance + amt
def getbalance(self):
return self.balance
class Withdrawl(Trasaction):
def withdrawl(self, amt):
self.balance = self.balance - amt
def getbalance(self):
return self.balance
import pickle
pickle.dump ((withdrawl), file ('account.pickle', 'w'))
pickle.dump ((deposit), file ('account.pickle', 'w'))
print "Your current account total is.", self.balance
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