Хорошие новости о видимости переменных
Python 2.x
>>> spam = 'spam'
>>> [spam for spam in range(1)]
[0]
>>> spam
0
Python 3.x
>>> spam = 'spam'
>>> [spam for spam in range(1)]
[0]
>>> spam
'spam'
>>> spam = 'spam'
>>> [spam for spam in range(1)]
[0]
>>> spam
0
Python 3.x
>>> spam = 'spam'
>>> [spam for spam in range(1)]
[0]
>>> spam
'spam'