python 反射

如何在python中实现 类似java中，

Class.forName().newInstance()

的功能

1. 静态导入

tommy@ubuntu:~$ python
Python 2.7.2+ (default, Oct  4 2011, 20:03:08)
[GCC 4.6.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from time import time
>>> globals()
{'__builtins__': , '__name__': '__main__', 'time': , '__doc__': None, '__package__': None}
>>> globals()["time"]

>>>

如果不显示导入 from time import time，会报异常，

tommy@ubuntu:~$ python
Python 2.7.2+ (default, Oct  4 2011, 20:03:08)
[GCC 4.6.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> globals()
{'__builtins__': , '__name__': '__main__', '__doc__': None, '__package__': None}
>>> globals()["time"]
Traceback (most recent call last):
  File "", line 1, in 
KeyError: 'time'
>>>

2. 动态导入

tommy@ubuntu:~$ python
Python 2.7.2+ (default, Oct  4 2011, 20:03:08)
[GCC 4.6.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> module=__import__('time')
>>> module

>>> se_time=getattr(module, "time")
>>> se_time

>>> se_time()
1332210676.294227
>>>

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