data.Account: Add is_real_asset method.

conservancy_beancount/data.py

@@ -35,6 +35,12 @@ from .beancount_types import (
 class Account(str):
     SEP = bc_account.sep
 
+    def is_real_asset(self) -> bool:
+        return (
+            self.is_under('Assets:')
+            and not self.is_under('Assets:PrepaidExpenses')
+        )
+
     def is_under(self, acct_s: str) -> bool:
         return self.startswith(acct_s) and (
             acct_s.endswith(self.SEP)

tests/test_data_account.py

@@ -30,3 +30,16 @@ from conservancy_beancount import data
 ])
 def test_is_under(acct_name, under_arg, expected):
     assert data.Account(acct_name).is_under(under_arg) == expected
+
+@pytest.mark.parametrize('acct_name,expected', [
+    ('Accrued:AccountsPayable', False),
+    ('Accrued:AccountsReceivable', False),
+    ('Assets:Cash', True),
+    ('Assets:Cash:EUR', True),
+    ('Assets:PrepaidExpenses', False),
+    ('Assets:Bank:Checking', True),
+    ('Expenses:General', False),
+    ('Income:Donations', False),
+])
+def test_is_real_asset(acct_name, expected):
+    assert data.Account(acct_name).is_real_asset() == expected