python class scope is odd

class_scope.py

class Spam(object):
    """
    Demo of python class scope
    fails 
    on py 3.5    
    > `File "class_scope.py", line 20, in <listcomp>`
    > `...`
    > `NameError: name 'ham_gen_list' is not defined`
    
    on py 2.7
    > `File "class_scope.py", line 21, in <genexpr>((i,))`
    > `...`
    > `NameError: global name 'ham_compre_enum_list' is not defined`
    
    """
    ham = 10
    ham_range = range(ham)
    ham_list = [x for x in ham_range]
    ham_gen_list = list(x for x in ham_list)
    ham_compre_enum_list = [ham_gen_list[i] for i in range(ham)]
    ham_gen_enum_list = list(ham_compre_enum_list[i] for i in range(ham))
    
# generators are functions but fail to capture the enclosing scope 
# in the same way as named-defined functions
# http://stackoverflow.com/a/13913933/3751373