学习《简明Python教程》第五天

 第8章 模块

 

#!/usr/bin/python

#Filename using_sys.py


import sys

print 'The command line arguments are:'

for i in sys.argv:  #sys.argv 是字串列表,包含了命令参数的列表

    print i

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

$python using_sys.py 1 2 3 5

The command line arguments are:

using_sys.py

1

2

3

5

 

 

The PYTHONPATH is ['/home/Administrator/temp', '/usr/lib/python26.zip', '/usr/lib/python2.6', '/usr/lib/python2.6/plat-cygwin', '/usr/lib/python2.6/lib-tk', '/usr/lib/python2.6/lib-old', '/usr/lib/python2.6/lib-dynload', '/usr/lib/python2.6/site-packages', '/usr/lib/python2.6/site-packages/PIL', '/usr/lib/python2.6/site-packages/gtk-2.0'] 

 

#!/usr/bin/python
#Filename using_name.py

if __name__ == '__main__':
    print 'This program is being run by itself'
else:
    print 'I am being imported from another module'

$python using_name.py

This program is being run by itself

 

$python

>>>import using_name

I am being imported from another module

 

#!/usr/bin/python
#Filename mymodule.py

def sayhi():
    print 'Hi,this is mymodule speaking.'

version = '0.1'

#end of mymodule.py

 

#!/usr/bin/python
#Filename mymodule_demo.py

import mymodule

mymodule.sayhi()
print 'Version', mymodule.version

$python mymodule_demo.py

Hi, this is mymodule speaking.

Version 0.1

 

#!/usr/bin/python
#Filename mymodule_demo2.py

from mymodule import sayhi, version
#Alternative:
#from mymodule import *

sayhi()
print 'Version', version

$ python

Python 2.6.8 (unknown, Jun  9 2012, 11:30:32) 

[GCC 4.5.3] on cygwin

Type "help", "copyright", "credits" or "license" for more information.

>>> import sys

>>> dir(sys)

['__displayhook__', '__doc__', '__excepthook__', '__name__', '__package__', '__stderr__', '__stdin__', '__stdout__', '_clear_type_cache', '_current_frames', '_getframe', 'api_version', 'argv', 'builtin_module_names', 'byteorder', 'call_tracing', 'callstats', 'copyright', 'displayhook', 'dont_write_bytecode', 'exc_clear', 'exc_info', 'exc_type', 'excepthook', 'exec_prefix', 'executable', 'exit', 'flags', 'float_info', 'getcheckinterval', 'getdefaultencoding', 'getdlopenflags', 'getfilesystemencoding', 'getprofile', 'getrecursionlimit', 'getrefcount', 'getsizeof', 'gettrace', 'hexversion', 'maxint', 'maxsize', 'maxunicode', 'meta_path', 'modules', 'path', 'path_hooks', 'path_importer_cache', 'platform', 'prefix', 'ps1', 'ps2', 'py3kwarning', 'setcheckinterval', 'setdlopenflags', 'setprofile', 'setrecursionlimit', 'settrace', 'stderr', 'stdin', 'stdout', 'subversion', 'version', 'version_info', 'warnoptions']

>>> dir()

['__builtins__', '__doc__', '__name__', '__package__', 'sys']

>>> a = 5

>>> dir()

['__builtins__', '__doc__', '__name__', '__package__', 'a', 'sys']

>>> del a

>>> dir()

['__builtins__', '__doc__', '__name__', '__package__', 'sys']

>>>