Bank transfer, Python Programming

Bank transfer

What  if we  have  two  values,  representing bank  accounts, and  need  to transfer an  amount of money  amt between them?  Consider that a bank account is shown as a list of values,  such as ['Alyssa', 8300343.03, 0.05], defining that 'Alyssa' has a bank balance  of $8,300,343.03, and has to give a 5-cent fee for every  bank transaction. We may  give  this function as follows. It transfers the amount from  one balance  to the other,  and  deduct the transaction fee from  each account.

def transfer(a1, a2, amt):

a1[1] = a1[1] - amt - a1[2]

a2[1] = a2[1] + amt - a2[2]

To understand what  it's doing,  you really have to read  the code at a detailed layer.  Furthermore, it's simple to get the variable names  and subscripts wrong.


Here's another version that  abstracts away  the common idea of a deposit (which  can be positive or negative) into a function, and uses it twice:


def transfer(a1, a2, amt): deposit(a1, -amt) deposit(a2, amt)

def deposit(a, amt):

a[1] = a[1] + amt - a[2]


Now,  transfer looks pretty simple, but deposit can  still use some work.  In particular, the need of numeric indices  to get the components out of the bank  account de?nition is a bit cryptic  (and easy to get wrong).10


def deposit(a, amt):

(name, balance, fee) = a

a[1] = balance + amt - fee


Here,  we've used  a destructuring assignment statement to give names  to the components of the account. Unfortunately, when  we want  to modify  a component of the list showing the account, we have  to index  it explicitly.   Shown  that  we have  to use explicit  indices,  this  mechanism in which  we name  them  might  be better.


acctName = 0 acctBalance = 1 acctFee = 2

def deposit(a, amt):

a[acctBalance] = a[acctBalance] + amt - a[acctFee]


Strive, in your  programming, to make  your  code as easy, simple, clear and  direct  as possible.  Rarely,  the clear  and  simple approach will be too inef?cient, and  you'll have  to work on  something more  hard. In such type, you should still initiate with  something simple and  clear,  and  in the end, you may use it as documentation


Posted Date: 8/9/2012 7:24:51 AM | Location : United States

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