Rounds up when adding multiple users to purchase instead of rounding down, meaning you cannot abuse the system by adding yourself multiple times.

Correctly logs transaction amount when applying penalty.
Better shows penalty effect in purchase menu.
Preparations for database format update.

db.py

@@ -1,6 +1,7 @@
 from sqlalchemy import Table, Column, Integer, String, MetaData, ForeignKey, create_engine, DateTime, Boolean, or_
 from sqlalchemy.orm import sessionmaker, relationship, backref
 from sqlalchemy.ext.declarative import declarative_base
+from math import ceil
 import datetime
 import conf
 
@@ -89,6 +90,7 @@ class Transaction(Base):
     amount = Column(Integer)
     description = Column(String(50))
     purchase_id = Column(Integer, ForeignKey('purchases.id'))
+    #penalty = Column(Integer)
 
     user = relationship(User, backref=backref('transactions', order_by=time))
 
@@ -97,11 +99,12 @@ class Transaction(Base):
         self.amount = amount
         self.description = description
         self.purchase = purchase
-        self.penalty_ratio = penalty_ratio
+        self.penalty = penalty_ratio
 
     def perform_transaction(self):
         self.time = datetime.datetime.now()
-        self.user.credit -= self.amount * self.penalty_ratio
+        self.amount *= self.penalty
+        self.user.credit -= self.amount
         if self.purchase:
             for entry in self.purchase.entries:
                 entry.product.stock -= entry.amount
@@ -131,7 +134,7 @@ class Purchase(Base):
         return len(self.transactions) > 0 and len(self.entries) > 0
 
     def price_per_transaction(self):
-        return self.price/len(self.transactions)
+        return int(ceil(float(self.price)/len(self.transactions)))
 
     def set_price(self):
         self.price = 0

text_based.py

@@ -787,6 +787,8 @@ class ShowUserMenu(Menu):
                 string += ', '.join(map(lambda e: e.product.name,
                                         t.purchase.entries))
                 string += ')'
+                #if t.penalty > 1:
+                #    string += ' * %dx penalty applied' % t.penalty
             else:
                 string += t.description
             string += '\n'
@@ -808,6 +810,8 @@ class ShowUserMenu(Menu):
                 string += ', '.join(map(lambda e: e.product.name,
                                         t.purchase.entries))
                 string += ')'
+                #if t.penalty > 1:
+                #    string += ' * %dx penalty applied' % t.penalty
             else:
                 string += t.description
             string += '\n'
@@ -1022,7 +1026,7 @@ When finished, write an empty line to confirm the purchase.
         if len(transactions) == 0:
             string += '(empty)'
         else:
-            string += ', '.join(map(lambda t: t.user.name,
+            string += ', '.join(map(lambda t: t.user.name + ("*" if t.user.credit < conf.user_recent_transaction_limit else ""),
                                     transactions))
         string += '\n products: '
         if len(entries) == 0:
@@ -1032,7 +1036,14 @@ When finished, write an empty line to confirm the purchase.
                                     entries))
         if len(transactions) > 1:
             string += '\n price per person: %d kr' % self.purchase.price_per_transaction()
+            if any(t.penalty > 1 for t in transactions):
+                string += ' *(%d kr)' % (self.purchase.price_per_transaction() * 2)
+
         string += '\n total price: %d kr' % self.purchase.price
+
+        if any(t.penalty > 1 for t in transactions):
+            string += '\n *total with penalty: %d kr' % sum(self.purchase.price_per_transaction() * t.penalty for t in transactions)
+
         return string
 
     def print_purchase(self):