List Comprehension / Generator in Python2.7 and 3.

comprehension.py

# I found this already described in:
#   Comprehensions in a class definition mostly cannot access class variable
#     [ http://bugs.python.org/issue11796 ]
# ...and my understanding is that this is not going to be fixed.

class Foo1:
    def foo(i): return i
    bar = (foo(i) for i in range(10))
print(Foo1.bar)

class Foo2:
    def foo(i): return i
    bar = [foo(i) for i in range(10)]
print(Foo2.bar)

# Results:
#
# $ python2.7 hoge.py
# <generator object <genexpr> at 0xb766b84c>
# [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
# 
# $ python3 hoge.py
# <generator object <genexpr> at 0xb75053c4>
# Traceback (most recent call last):
#   File "hoge.py", line 6, in <module>
#     class Foo2:
#   File "hoge.py", line 8, in Foo2
#     bar = [foo(i) for i in range(10)]
#   File "hoge.py", line 8, in <listcomp>
#     bar = [foo(i) for i in range(10)]
# NameError: global name 'foo' is not defined
#