是否在GnuCash中创建事务以回复电子邮件？

Question

我想创建一个由电子邮件过滤器触发的脚本，当运行时，在GnuCash中创建两个事务。我看到了GnuCash has Python bindings，但文档充其量也是很稀疏的……更好的说法应该是“不存在”。

有没有可能写一个在GnuCash中创建事务的脚本？如果是这样，那么最基本的代码会是什么样子呢？我只需要一个起点；一旦我有了起点，我就可以很好地自己编写脚本。

Answer 1

这里有一个替代的解决方案，使用piecash (https://github.com/sdementen/piecash，版本0.10.1)，一个现代的python库来处理gnucash书籍(免责声明：I am the author)

from piecash import open_book, Transaction, Split
from datetime import datetime
from decimal import Decimal

# open the book
with open_book("/path/to/file.gnucash", 
               open_if_lock=True, 
               readonly=False) as mybook:
    today = datetime.now()
    # retrieve the currency from the book
    USD = mybook.currencies(mnemonic="USD")
    # define the amount as Decimal
    amount = Decimal("25.35")
    # retrieve accounts
    to_account = mybook.accounts(fullname="Expenses:Some Expense Account")
    from_account = mybook.accounts(fullname="Assets:Current Assets:Checking")
    # create the transaction with its two splits
    Transaction(
        post_date=today,
        enter_date=today,
        currency=USD,
        description="Transaction Description!",
        splits=[
            Split(account=to_account,
                  value=amount,
                  memo="Split Memo!"),
            Split(account=from_account,
                  value=-amount,
                  memo="Other Split Memo!"),
        ]
    )
    # save the book
    mybook.save()

Answer 2

这是一个模板，以及一些在库中严重缺乏的帐户查找功能。您可以将所有事务代码放入一个函数中，然后提交创建这两个自定义事务所需的任何数据。然后，只需从您的电子邮件侦听器调用事务函数，您就可以开始工作了。

from gnucash import Session, Account, Transaction, Split, GncNumeric
import gnucash
from datetime import datetime

def lookup_account_by_path(parent, path):
    acc = parent.lookup_by_name(path[0])
    if acc.get_instance() == None:
        raise Exception('Account path {} not found'.format(':'.join(path)))
    if len(path) > 1:
        return lookup_account_by_path(acc, path[1:])
    return acc

def lookup_account(root, name):
    path = name.split(':')
    return lookup_account_by_path(root, path)

session = Session("/path/to/file.gnucash") #, ignore_lock=True)
   # or use URI string: ('mysql://USER:PASSWORD@HOST/DATABASE')

today = datetime.now()
book = session.book # All actions are performed through the book object (or its children)
root = book.get_root_account() # Parent of all accounts
currency = book.get_table().lookup('ISO4217', "USD")
tx = Transaction(book)
tx.BeginEdit()
tx.SetCurrency(currency)
tx.SetDateEnteredTS(today)
tx.SetDatePostedTS(today) # or another datetime object for the transaction's "register date"
tx.SetDescription("Transaction Description!")
#tx.SetNum(int_variable) # if you need a transaction number

sp1 = Split(book) # First half of transaction
sp1.SetParent(tx)
# The lookup string needs to match your account path exactly.
sp1.SetAccount(lookup_account(root, "Expenses:Some Expense Account"))
# amount is an int (no $ or .), so $5.23 becomes amount=523
sp1.SetValue(GncNumeric(amount, 100)) # Assuming you only have one split
# For multiple splits, you need to make sure the totals all balance out.
sp1.SetAmount(GncNumeric(amount, 100))
sp1.SetMemo("Split Memo!") # optional

sp2 = Split(book) # Need a balancing split
sp2.SetParent(tx)
sp2.SetAccount(lookup_account(root, "Assets:Current Assets:Checking"))
sp2.SetValue(sp1.GetValue().neg())
sp2.SetAmount(sp1.GetValue().neg())
sp2.SetMemo("Other Split Memo!") # optional

tx.CommitEdit() # Finish editing transaction
session.save()
session.end()