>>> myString = 'Hello World!'
>>> print myString
Hello World!
>>> myString
'Hello World!'

>>> user=raw_input ('Enter login name:')
Enter login name: root
>>> print 'Your login is:’, user
Your login is: root

>>> num=raw_input('Now enter a number:')
Now enter a number:2014
>>> print 'Doubling your number:%d' % (int(num) * 2)
Doubling your number:4028

>>> print -2*4+3**2
1

>>> 2<4 and 2==1
False
>>> 2>4 or 2<4
True

 >>> n=10
>>> n=n*10
>>> n
100
>>> n*=10
>>> n
1000

>>> adict={'host':'earth'}
>>> adict['port']=80
>>> adict
{'host': 'earth', 'port': 80}
>>> adict.keys()
['host', 'port']
>>> adict['host']
'earth'
>>> for key in adict:
    print key,adict[key]

host earth
port 80

if  :
  else:

If :
   elif:
else:

while :
   print 

>>> counter =0
>>> while counter<3:
    print 'loop #%d' % (counter)
    counter +=1


loop #0
loop #1
loop #2

>>> for item in ['e-mail','net-surfing','homework','chat']:
    print item

e-mail
net-surfing
homework
chat

>>> for item in ['e-mail','net-surfing','homework','chat']:
    print item,

e-mail net-surfing homework chat

>>> for eachNum in range(3):
    print eachNum


0
1
2

>>> sqdEvens=[x**2 for x in range(8) if not x %2]
>>> for i in sqdEvens:
    print i,


0 4 16 36

>>> filename=raw_input('Enter file name:')
Enter file name:E:/workp/python/经济学人词库.txt
>>> fobj=open(filename,'r')
>>> for eachLine in fobj:
    print eachLine,
    fobj.close()

>>> try:
    filename=raw_input('Enter file name:')
    fobj=open(filename,'r')
    for eachline in fobj:
        print eachline,fobj.close()
except IOError,e:
    print 'file open error:',e

>>> def addMe2Me(x):
    'apply+operation to argument'
    return(x+x)

>>> addMe2Me(4)
8