trick

item.py

import dis


def item_instanate():

    class Item:
        pass

    print(Item(), Item(), Item())


print(dis.dis(item_instanate))
item_instanate()


'''
  6           0 LOAD_BUILD_CLASS
              1 LOAD_CONST               1 (<code object Item at 0x7f9f8bd58150, file "item.py", line 6>)
              4 LOAD_CONST               2 ('Item')
              7 MAKE_FUNCTION            0
             10 LOAD_CONST               2 ('Item')
             13 CALL_FUNCTION            2 (2 positional, 0 keyword pair)
             16 STORE_FAST               0 (Item)

  9          19 LOAD_GLOBAL              0 (print)
             22 LOAD_FAST                0 (Item)
             25 CALL_FUNCTION            0 (0 positional, 0 keyword pair)
             28 LOAD_FAST                0 (Item)
             31 CALL_FUNCTION            0 (0 positional, 0 keyword pair)
             34 LOAD_FAST                0 (Item)
             37 CALL_FUNCTION            0 (0 positional, 0 keyword pair)
             40 CALL_FUNCTION            3 (3 positional, 0 keyword pair)
             43 POP_TOP
             44 LOAD_CONST               0 (None)
             47 RETURN_VALUE
None
<__main__.item_instanate.<locals>.Item object at 0x7f9f8bcb4cc0> <__main__.item_instanate.<locals>.Item object at 0x7f9f8bcb4cf8> <__main__.item_instanate.<locals>.Item object at 0x7f9f8bcb4eb8>
'''

item_2k.py

import dis


def item_instanate():

    class Item:
        pass

    print Item(), Item(), Item()


print dis.dis(item_instanate)
item_instanate()


'''
  6           0 LOAD_CONST               1 ('Item')
              3 LOAD_CONST               3 (())
              6 LOAD_CONST               2 (<code object Item at 0x7f37cfa3b2b0, file "item_2.py", line 6>)
              9 MAKE_FUNCTION            0
             12 CALL_FUNCTION            0
             15 BUILD_CLASS         
             16 STORE_FAST               0 (Item)

  9          19 LOAD_FAST                0 (Item)
             22 CALL_FUNCTION            0
             25 PRINT_ITEM          
             26 LOAD_FAST                0 (Item)
             29 CALL_FUNCTION            0
             32 PRINT_ITEM          
             33 LOAD_FAST                0 (Item)
             36 CALL_FUNCTION            0
             39 PRINT_ITEM          
             40 PRINT_NEWLINE       
             41 LOAD_CONST               0 (None)
             44 RETURN_VALUE        
None
<__main__.Item instance at 0x7f37cf9ef950> <__main__.Item instance at 0x7f37cf9ef950> <__main__.Item instance at 0x7f37cf9ef950>
'''

item_2k_with_print_fn.py

from __future__ import print_function

import dis


def item_instanate():

    class Item:
        pass

    print(Item(), Item(), Item())


print(dis.dis(item_instanate))
item_instanate()


'''
  8           0 LOAD_CONST               1 ('Item')
              3 LOAD_CONST               3 (())
              6 LOAD_CONST               2 (<code object Item at 0x7f6aaed022b0, file "item_2_print_fn.py", line 8>)
              9 MAKE_FUNCTION            0
             12 CALL_FUNCTION            0
             15 BUILD_CLASS         
             16 STORE_FAST               0 (Item)

 11          19 LOAD_GLOBAL              0 (print)
             22 LOAD_FAST                0 (Item)
             25 CALL_FUNCTION            0
             28 LOAD_FAST                0 (Item)
             31 CALL_FUNCTION            0
             34 LOAD_FAST                0 (Item)
             37 CALL_FUNCTION            0
             40 CALL_FUNCTION            3
             43 POP_TOP             
             44 LOAD_CONST               0 (None)
             47 RETURN_VALUE        
None
<__main__.Item instance at 0x7f6aaecb6d40> <__main__.Item instance at 0x7f6aaecb6cf8> <__main__.Item instance at 0x7f6aaecb6dd0>
'''