Migrate to python 3.

move.py

@@ -10,8 +10,7 @@ DIGITS = config_.getint('product', 'price_decimal', default=4)
 DISCOUNT_DIGITS = config_.getint('product', 'discount_decimal', default=4)
 
 
-class Move:
-    __metaclass__ = PoolMeta
+class Move(metaclass=PoolMeta):
     __name__ = 'stock.move'
 
     @classmethod

purchase.py

@@ -18,8 +18,7 @@ DIGITS = config_.getint('product', 'price_decimal', default=4)
 DISCOUNT_DIGITS = config_.getint('product', 'discount_decimal', default=4)
 
 
-class PurchaseLine:
-    __metaclass__ = PoolMeta
+class PurchaseLine(metaclass=PoolMeta):
     __name__ = 'purchase.line'
 
     gross_unit_price = fields.Numeric('Gross Price', digits=(16, DIGITS),

setup.py

@@ -7,10 +7,7 @@ from setuptools import setup
 import re
 import os
 import io
-try:
-    from configparser import ConfigParser
-except ImportError:
-    from ConfigParser import ConfigParser
+from configparser import ConfigParser
 
 MODULE = 'purchase_discount'
 PREFIX = 'trytonspain'

tests/scenario_purchase.rst

@@ -139,7 +139,7 @@ Create an Inventory::
     >>> inventory_line.save()
     >>> Inventory.confirm([inventory.id], config.context)
     >>> inventory.state
-    u'done'
+    'done'
 
 Purchase 5 products testing several on_change calls and avoiding division by zero::
 
@@ -188,7 +188,7 @@ Process purchase::
     >>> purchase.click('confirm')
     >>> purchase.click('process')
     >>> purchase.state
-    u'processing'
+    'processing'
     >>> purchase.reload()
     >>> invoice, = purchase.invoices
     >>> invoice.origins == purchase.rec_name