dear programmers..

am among those that cudnt make it to Andela in the previous application so getting set for the next.

so.. am really confused about the self. parameter in python... here is ma code

class Customers:
account_balance = 0.0

def _init_(self):
self.account_type = str(input('account type:'))
self.name = str(input('enter name of customer:'))
self.account_balance = 0

def withdrawal(self):
self.amount = int(input('specify amount you want withdrawal:'))
if amount > self.account_balance:
print('sorry; insufficient balance')
else:
self.account_balance -= amount
return self.account_balance

def deposit(self):
deposit_amount = int(input('please enter deposit amount:'))
self.account_balance += deposit_amount
print('you just deposited ', deposit_amount, ' and you new balance is' , self.account_balance)


customer1 = Customers()
customer2 = Customers()


the problem is about self..

now i created a class Customers and a class variable called account_balance
i know that if i want to make use of the class variable in any of the modules in class Customer
i wud simply do: self.account_balance

my question is this:

if i want to create a variable in a module; do i still need to tag it with the self.?
like i did in the def widrawal(self)

def withdrawal(self)
self.amount = ........

or shud i just define the variable without the self?

would appreciate a ditailed answer.. thanks

You don't need to use self in module, you can simply use the variable amount instead.

Below is a sample code:

def withdrawal(amount):
if amount > account_balance:
print('sorry; insufficient balance')
else:
account_balance -= amount
return account_balance


def deposit(amount):
account_balance += amount
print('you just deposited, ' amount ' and you new balance is' , account_balance)
return account_balance


NB: saving the above code as bank.py

>>> from bank import withdrawal, deposit

account_balance = 5000
x = int(input('please enter deposit amount:'))
>>> please enter deposit amount: 3000


withdrawal (x)
>>> 2000
OR
deposit (x)
>>> 8000


Hope this helps.

thanks bro..

alot

the self variable is a constant variable taht should be in any method parameter declaration,..

The self variable makes it easier to access the class/program variables e.g

socket = Socket.socket()
request = ""

def processRequest(self, request):
self.request = request

It is very important to add the self variable in your method parameters, some programmers might say it is not important, but in the actual sense it is **** important

When you start coding with bigger erp frameworks like odoo 10, you willl really need to develop the norm of using self in you method......

TechRex:
the self variable is a constant variable taht should be in any method parameter declaration,..

The self variable makes it easier to access the class/program variables e.g

socket = Socket.socket()
request = ""

def processRequest(self, request):
self.request = request

It is very important to add the self variable in your method parameters, some programmers might say it is not important, but in the actual sense it is **** important

When you start coding with bigger erp frameworks like odoo 10, you willl really need to develop the norm of using self in you method......

what if u wana create a variable in the method.. that dont need to be supplied argument..
like say:

def addition(self; num1; num2)
result = self.num1 + self.num2
return result

now is the result supposed to be self.result??

In my opinion, the class being a class object, the def is ur method. We are suppose to initialize, therefore, u can use the built-in-function, __init__() constructor. The first arguement, self, is referring to the class name, and other arguement can follow. But where would the arguement land?

Therefore, one need to create variables to hold this arguement when they're passed.

To do this,

Self.the_name_you_choose = one_ of_the_argument
Self.the_name_you_choose = another_argument.

After creating an instance (which is passing values into that class created) , one can then access this variables by 'classname.variable_name_in_the_class'

Example

Class point: #classname
Def __init__(self, x, y): #initialising with a constructor
Self.x = x #assigning classname.x
Self.y = y #assigning classname.y

Pt = point(5,6) #creating an object of classname
Sum = int (pt.x + pt.y) #using the created object

Print(sum) #print result



I hope this help. I stand to be corrected as I started learning too less than a month now.

phililp

fleshbone:
In my opinion, the class being a class object, the def is ur method. We are suppose to initialize, therefore, u can use the built-in-function, __init__() constructor. The first arguement, self, is referring to the class name, and other arguement can follow. But where would the arguement land?

Therefore, one need to create variables to hold this arguement when they're passed.

To do this,

Self.the_name_you_choose = one_ of_the_argument
Self.the_name_you_choose = another_argument.

After creating an instance (which is passing values into that class created) , one can then access this variables by 'classname.variable_name_in_the_class'

Example

Class point: #classname
Def __init__(self, x, y): #initialising with a constructor
Self.x = x #assigning classname.x
Self.y = y #assigning classname.y

Pt = point(5,6) #creating an object of classname
Sum = int (pt.x + pt.y) #using the created object

Print(sum) #print result



I hope this help. I stand to be corrected as I started learning too less than a month now.

phililp

thanks for ur contribution fleshbone... but i think nobody has gotten my point

lemme make it clear

if i want to create an instance variable that is not a parameter. and no argument is supposed to be passed to it..
do i stiill need to tag it with self??

example

class customers:
-----def add_two_nums(self; num1; num2)
-------outcome = self.num1 + self.num2
-------return outcome


[center]or[/center]

class customers:
-----def add_two_nums(self; num1; num2)
-------self.outcome = self.num1 + self.num2
-------return self.outcome

isorite guys...I guys the quuestion here has been answered.

NOTE: Codes may perform identical functions, but with entirely different lines!.

...and no way is the best, the best way in our world is the most secure way!

phililp:


thanks for ur contribution fleshbone... but i think nobody has gotten my point

lemme make it clear

if i want to create an instance variable that is not a parameter. and no argument is supposed to be passed to it..
do i stiill need to tag it with self??

example

class customers:
-----def add_two_nums(self; num1; num2)
-------outcome = self.num1 + self.num2
-------return outcome


[center]or[/center]

class customers:
-----def add_two_nums(self; num1; num2)
-------self.outcome = self.num1 + self.num2
-------return self.outcome

Here, I see the num1 and num2 as ur argument.

'Self.outcome = num1 + num2'

I don't think u need to put self before them.

I would try it too sha.

Try this


--------------------------------------------------------------

Class sum_it:
--- Def __init__(self, num1, num2):
------- Self.answer = num1 + num2



Def main():
----Ans = sum_it(5,10)
--------Print(answer.ans)




Main()



------------------------------------------------------------------------



The above worked for me. I just tried it. Goodluck phililp.

phililp:


what if u wana create a variable in the method.. that dont need to be supplied argument..
like say:

def addition(self; num1; num2)
result = self.num1 + self.num2
return result

now is the result supposed to be self.result??

Dont get you sir

TechRex:


Dont get you sir

dun worry techrex.. have got it..

and thanks alot for ur concern sir..

hey fleshbone.. looks like we both in same route..

i just started learning python a couple of weeks ago.

u can add me up on fb lets share ideas..

username = "philips chike"
linkedin: https://www.linkedin.com/in/philip-chike-54780313a/


thanks