hazimarino...

リアクション

>>> for i in ([], 0, '', None):
...     if i:
...         print(u"{0!r:4} = 真".format(i))
...     elif not i:
...         print(u"{0!r:4} = 偽".format(i))
...
[]   = 偽
0    = 偽
''   = 偽
None = 偽