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1.1 HTTP request status = 200, Ò³ÃæÏÂÔØÕýÈ·
from urllib import urlopen
# set up
url = None
# test
url = urlopen('http://www.baidu.com')
assert url.getcode() == 200
# clean up
del url
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(1) os.system
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system(command) -> exit_status   
Execute the command (a string) in a subshell. 
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>>> os. ......

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class Functor:
    """Simple functor class."""
    def __init__( self, fn, *args ):
        self.fn = fn
        ......

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