one difference of python3 from python
2014-12-09 19:38
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Python 2.7.3
>>> s = 'abcdef'
>>> for i in [None] + range(-1, -len(s), -1):
... print s[:i]
...
abcdef
abcde
abcd
abc
ab
a
Python 3.3.0
>>> s = 'abcdef'
>>> for i in [None] + range(-1, -len(s), -1):
... print(s[:i])
...
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: can only concatenate list (not "range") to list
>>> s = 'abcdef'
>>> for i in [None] + range(-1, -len(s), -1):
... print s[:i]
...
abcdef
abcde
abcd
abc
ab
a
Python 3.3.0
>>> s = 'abcdef'
>>> for i in [None] + range(-1, -len(s), -1):
... print(s[:i])
...
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: can only concatenate list (not "range") to list
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