python笔记：模块

#!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')


#from sys import argv

#!python
# filename using_name.py
if __name__=='__main__':
    print('This program is being run by itself')
else:
    print('I am imported from other module')

#!python
#filename mymodule.py
def sayhi():
    print('Hi, this is mymodule speaking.')
__version__='0.618'
something='something'

#!python
#filename mymodule_demo.py
import mymodule
mymodule.sayhi()
print('Version',mymodule.__version__)
print(mymodule.something)
#from mymodule import sayhi,__version__
#sayhi()
#print('Version',__version__')

>>>import this

>>>import sys
>>>dir(sys)
>>>dir()
>>>a=5
>>>dir()
>>>del a
>>>dir()