你需要from __future__ import print_function。
在Python 2.x中，您正在执行的操作被解释为在使用3.x语法时打印一个元组。
例：
>>> name = 'Ryan'
>>> days = 3
>>> print(name, 'has been alive for', days, 'days.')
('Ryan', 'has been alive for', 3, 'days.')
>>> from __future__ import print_function
>>> print(name, 'has been alive for', days, 'days.', sep=', ')
Ryan, has been alive for, 3, days.
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