Budget App Project Failed Transfer method in Unittests

Python
1

I need help please in this transfer method this is my whole code but I get weird outputs I don’t know why

class Category:

   def __init__(self,budget_category):

       self.ledger = []

       self.budget_category = budget_category

       self.call = False

   def deposit( self, amount, description = ''):

       self.amount = amount

       self.description = description

       if self.call:

           Category(self.anthr_category).ledger.append({"amount": self.amount, "description": self.description})

           return None

       self.ledger.append({"amount": self.amount, "description": self.description})

   def withdraw(self , withdraw_amount , description = ''):

       self.withdraw_amount = withdraw_amount

       self.description = description

       if self.withdraw_amount <= self.get_balance(): 

           self.ledger.append({"amount": -self.withdraw_amount, "description": self.description})    

       return self.check_funds(self.withdraw_amount)

   def get_balance(self):

       balance = 0

       for item in range(len(self.ledger)):

           balance += self.ledger[item]["amount"]

       return balance

   def transfer(self, trans_amount , anthr_category):

       self.anthr_category = anthr_category

       self.trans_amount = trans_amount

       self.call = self.check_funds(self.trans_amount)

       if self.call:

           self.withdraw(self.trans_amount , f"Transfer to {self.anthr_category}")

           self.deposit(self.trans_amount , f"Transfer from {self.budget_category}")

       return self.call

   def check_funds(self , amount):

       self.amount = amount

       if self.amount > self.get_balance():

           return False

       return True

   def _string(self):

       self.header = self.budget_category.center(30 , '*')

       self.lst = ''

       for item in range(len(self.ledger)):

           self.short_descrptn = self.ledger[item]["description"][:23]

           self.cash = f'{self.ledger[item]["amount"]:.2f}'.rjust(30-(len(self.short_descrptn)))

           self.lst += f'{self.short_descrptn}{self.cash}' + '\n'

       self.lst = self.lst + f'Total: {self.get_balance()}'

       return self.header + '\n'+ self.lst

   def __str__(self):

       return self._string()

when I run the test module I get weird astericks on the test_transfer method in class unittests as follows `======================================================================
FAIL: test_to_string (main.UnitTests)

Traceback (most recent call last):
File “c:\Users\Bradleys\Desktop\python projects\boilerplate-budget-app\test_module.py”, line 83, in test_to_string
self.assertEqual(actual, expected, ‘Expected different string representation of object.’)
AssertionError: ‘[75 chars]ggs, bac -45.67\nTransfer to ********Ent -20.00\nTotal: 834.33’ != '[75 chars]ggs, bac -45.67\nTransfer to Entertainme -20.00\nTotal: 834.33’
Food
deposit 900.00
milk, cereal, eggs, bac -45.67

  • Transfer to ********Ent -20.00
  • Transfer to Entertainme -20.00
    Total: 834.33 : Expected different string representation of object.

======================================================================
FAIL: test_transfer (main.UnitTests)

Traceback (most recent call last):
File “c:\Users\Bradleys\Desktop\python projects\boilerplate-budget-app\test_module.py”, line 52, in test_transfer
self.assertEqual(actual, expected, ‘Expected transfer method to create a specific ledger item in food object.’)
AssertionError: {‘amo[18 chars]ption’: ‘Transfer to Entertainment*\nTotal: 0’} != {‘amo[18 chars]ption’: ‘Transfer to Entertainment’}

  • {‘amount’: -20, ‘description’: ‘Transfer to Entertainment’}
  • {‘amount’: -20,
  • ‘description’: ‘Transfer to Entertainment*\nTotal: 0’} : Expected transfer method to create a specific ledger item in food object.

Ran 11 tests in 0.008s

FAILED (failures=3)`

2

Remember that using class instance in a string requires it to be written as a string, this makes use of the string representation of that instance. Does this make clearer what is happening?

3

Create a __repr__ method in the class so that when you want to have the assigned representation of your anthr_category argument, you just call on it with anthr_category.__repr__.

def __repr__(self):
    return self.budget_category

def transfer(self, trans_amount , anthr_category):

       self.anthr_category = anthr_category

       self.trans_amount = trans_amount

       self.call = self.check_funds(self.trans_amount)

       if self.call:

           self.withdraw(self.trans_amount , f"Transfer to {anthr_category.__repr__()}")

           self.deposit(self.trans_amount , f"Transfer from {self.__repr__()}")

       return self.call

I think this will do it, tell me if there are any more additional problems.

4

I did not understand what you meant can you please elaborate through examples if possible

5

great idea but won’t this idea go against the general use of repr() method

6

In other words - f"Transfer to {self.anthr_category}" are calling __str__ method of the class.

8

Thanks let me read more about this

9

Thanks it got the job done

10

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