boolean and "A" or "B"みたいな書き方できたら賢そう【Python】【でも】 ref: http://qiita.com/ssh0/items/51aacabde077c50c0922

file0.txt

>>> def test(flag=True):
...     print 'flag: %s' % (flag and 'on' or 'off')
... 

file1.txt

>>> test(True)
flag: on
>>> test(False)
flag: off

file2.txt

>>> def test(flag=True):
...    print 'flag: %s' % ('on' if flag else 'off')