??8?? ???

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???sys???

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from..import???

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???????__name__

??????????????

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from..import

dir()????

???dir????

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?????????????????????ж?????κ???????????????????????????????????ú??????????????α?д????????????????μ?????????????顣?????????????????????????????????????????????????????????????????飬???????????????.py????????

??????????????? ???? ???????????????????????????Python???????????????????????????????????顣

???sys???

??8.1 ???sys???

#!/usr/bin/python
# Filename: using_sys.py

import sys

print 'The command line arguments are:'
for i in sys.argv:
    print i

print '\n\nThe PYTHONPATH is', sys.path, '\n'

????????code/using_sys.py??

???

$ python using_sys.py we are arguments
The command line arguments are:
using_sys.py
we
are
arguments


The PYTHONPATH is ['/home/swaroop/byte/code', '/usr/lib/python23.zip',
'/usr/lib/python2.3', '/usr/lib/python2.3/plat-linux2',
'/usr/lib/python2.3/lib-tk', '/usr/lib/python2.3/lib-dynload',
'/usr/lib/python2.3/site-packages', '/usr/lib/python2.3/site-packages/gtk-2.0']

????ι???

?????????????import??? ???? sys??顣????????????????Python?????????????????顣sys??????????Python????????????????й???????

??Python???import sys???????????sys.path?????????????????sys.py??顣????????????????????????????е???佫?????У?????????齫??????? ??? ????????????????????? ????? ?????????????С???????sys?????system??????д??

sys????е?argv???????????????????sys.argv???????????????????????????????????κ???????????????argv????????????????????????????????????sys??????????

sys.argv???????????????? ?б? ???б??????????????????????????sys.argv?????? ?????в??? ???б????????????д????????????????

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?????????????python using_sys.py we are arguments????????????python????????using_sys.py??飬?????????????????????????????Python?????????洢??sys.argv?????С?

??????????????????sys.argv?б???????????????????????'using_sys.py'??sys.argv[0]??'we'??sys.argv[1]??'are'??sys.argv[2]???'arguments'??sys.argv[3]?????Python??0??????????????1?????

sys.path?????????????????б???????????sys.path????????????????????????????????????????sys.path????????????PYTHONPATH????????????????????ζ??????????????λ??????????顣??????e??????????sys.path???е???????