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delavska_hranilnica.py
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delavska_hranilnica.py
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import csv
import datetime
from dataclasses import dataclass
from decimal import Decimal
from io import TextIOBase
from typing import List, Optional
def _parse_date(d: str) -> datetime.date:
"""Parse a date in DD.MM.YYYY format (i.e. 13.12.2022)"""
return datetime.datetime.strptime(d, "%d.%m.%Y").date()
def _parse_amount(a: str) -> Optional[Decimal]:
"""Parse an amount (i.e. 11.353,15) into a Decimal"""
if len(a) == 0:
return None
whole_and_fraction = a.replace('.', '').replace(',', '.')
return Decimal(whole_and_fraction)
@dataclass
class Account:
"""Bank account info"""
bank: str
"""Bank name"""
owner: str
"""Account owner"""
account_number: str
"""Account number"""
@dataclass
class Transaction:
"""Transaction details"""
currency: str
"""3-letter currency code, i.e. 'EUR'"""
value_date: datetime.date
"""The date when transaction took place (SLO: datum valute)"""
posting_date: datetime.date
"""The date when transaction was processed (SLO: datum knjiženja)"""
transaction_id: str
"""Bank's transaction ID"""
reclamation_nr: str
"""Transaction number for reclamation purposes"""
payer_or_payee: str
"""The other party in the transaction"""
amount_paid: Optional[Decimal]
"""Amount paid, in cents"""
amount_received: Optional[Decimal]
"""Amount received, in cents"""
reference_payee: str
"""Payee's reference"""
reference_payer: str
"""Payer's reference"""
description: str
"""The description"""
@dataclass
class TransactionsExport:
"""Transaction export and metadata"""
account: Account
"""Account info"""
export_from: datetime.date
"""Export start date"""
export_to: datetime.date
"""Export end date"""
export_date: datetime.date
"""The date of the export"""
final_balance: Decimal
transactions: List[Transaction]
"""Transactions"""
@classmethod
def from_text(cls, text: TextIOBase) -> 'TransactionsExport':
reader = csv.reader(text, delimiter=';', )
bank_line = next(reader)
assert bank_line[0] == 'Banka:'
bank = bank_line[1]
owner_line = next(reader)
assert owner_line[0] == 'Komitent:'
owner = owner_line[1]
from_and_to_dates_line = next(reader)
assert from_and_to_dates_line[0] == 'Promet za obdobje:'
from_and_to_dates = from_and_to_dates_line[1].split(' - ')
export_from = _parse_date(from_and_to_dates[0])
export_to = _parse_date(from_and_to_dates[1])
export_date_line = next(reader)
assert export_date_line[0] == 'Datum izpisa:'
export_date = _parse_date(export_date_line[1])
next(reader) # empty line
account_number_line = next(reader)
assert account_number_line[0] == 'Račun'
account_number = account_number_line[1]
balances_header_line = next(reader)[0:5]
assert balances_header_line == ['Valuta', 'Začetno stanje', 'Breme', 'Dobro', 'Končno stanje']
[currency, initial_balance, total_paid, total_received, final_balance] = next(reader)[0:5]
assert len(currency) == 3
next(reader)
account = Account(
bank=bank,
owner=owner,
account_number=account_number
)
header_line = next(reader)
assert header_line == ['Valuta', 'Datum valute', 'Datum knjiženja', 'ID transakcije',
'Št. za reklamacijo', 'Prejemnik / Plačnik', 'Breme', 'Dobro', 'Referenca plačnika',
'Referenca prejemnika', 'Opis prejemnika']
# The following lines are transactions
transactions = [cls._list_to_transaction(t) for t in reader if len(t) == len(header_line)]
return cls(
account=account,
export_from=export_from,
export_to=export_to,
export_date=export_date,
final_balance=_parse_amount(final_balance),
transactions=transactions
)
@classmethod
def from_file(cls, filename: str) -> 'TransactionsExport':
with open(filename, 'rt', encoding='cp1250') as f:
return cls.from_text(f)
@classmethod
def _list_to_transaction(cls, t: List) -> Transaction:
return Transaction(
currency=t[0],
value_date=_parse_date(t[1]),
posting_date=_parse_date(t[2]),
transaction_id=t[3],
reclamation_nr=t[4],
payer_or_payee=t[5],
amount_paid=_parse_amount(t[6]),
amount_received=_parse_amount(t[7]),
reference_payer=t[8],
reference_payee=t[9],
description=t[10]
)