python 3.3版本为何无法运行文中的代码片段？？
print (hello)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'hello' is not defined
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print (hello)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'hello' is not defined
2019-09-16
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