Python26创建集合和Python27的区别

在Python26中，创建集合可以用setname = set(iteration)来实现。

比如：

Python 2.6.6 (r266:84292, Dec  7 2011, 20:48:22) 
[GCC 4.4.6 20110731 (Red Hat 4.4.6-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> set_1 = set([1, 2, 3])
>>> print set_1
set([1, 2, 3])

在Python26中使用set_1 = {1, 2, 3}创建集合是错误的语法SyntaxError: invalid syntax

Python 2.6.6 (r266:84292, Dec  7 2011, 20:48:22) 
[GCC 4.4.6 20110731 (Red Hat 4.4.6-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> set_1 = {1, 2, 3}
  File "", line 1
    set_1 = {1, 2, 3}
              ^
SyntaxError: invalid syntax

而Python27以及之后的版本是支持使用set_1 = {1, 2, 3}的。