print "Mary had a little lamb."
print "Its fleece was white as %s." % 'snow'
print "." * 10

end1 = "C"
end2 = "h"
print end1 + end2

>>> python ex7.py
Mary had a little lamb.
Its fleece was white as snow.
..........
Ch

# %r
formatter = "%r %r %r %r"
print formatter % (1, 2, 3, 4)
print formatter % ("one", "two", "three", "four")
print formatter % (True, False, False, True)
print formatter % (formatter, formatter, formatter, formatter)
print formatter % (
    "I had this thing.",
    "That you could type up right.",
    "But it didn't sing.",
    "So I said goodnight."
)

>>> python ex8.py
1 2 3 4
'one' 'two' 'three' 'four'
True False False True
'%r %r %r %r' '%r %r %r %r' '%r %r %r %r' '%r %r %r %r'
'I had this thing.' 'That you could type up right.' "But it didn't sing." 'So I said goodnight.'

s1 = '''This string contains """ so use triple-single-quotes.''' # print """
s2 = """This string contains ''' so use triple-double-quotes.""" # print '''

age = raw_input()
x = int(raw_input())
input() # will try to convert things you enter as if they were Python code, but it has security problems so you should avoid it.
age = raw_input("How old are you? ")

from sys import argv

script, first, second, third = argv

print "The script is called:", script
print "Your first variable is:", first
print "Your second variable is:", second
print "Your third variable is:", third

from sys import argv

script, filename = argv

txt = open(filename)

print "Here's your file %r:" % filename
print txt.read()

print "Type the filename again:"
file_again = raw_input("> ")

txt_again = open(file_again)

print txt_again.read()

indata = open(from_file).read()

def print_two(*args):
    arg1, arg2 = args
    print "arg1: %r, arg2: %r" % (arg1, arg2)

# ok, that *args is actually pointless, we can just do this
def print_two_again(arg1, arg2):
    print "arg1: %r, arg2: %r" % (arg1, arg2)

# this just takes one argument
def print_one(arg1):
    print "arg1: %r" % arg1

# this one takes no arguments
def print_none():
    print "I got nothin'."


print_two("Zed","Shaw")
print_two_again("Zed","Shaw")
print_one("First!")
print_none()

import urllib2

response = urllib2.urlopen("http://www.baidu.com")
print response.read()

urlopen(url, data, timeout) #data默认为空None，timeout默认为 socket._GLOBAL_DEFAULT_TIMEOUT

# alternative way
request = urllib2.Request("http://www.baidu.com")
response = urllib2.urlopen(request)
print response.read()

import urllib
import urllib2

values = {"username":"1016903103@qq.com","password":"XXXX"}
data = urllib.urlencode(values)
#values = {}
#values['username'] = "1016903103@qq.com"
#values['password'] = "XXXX"
#data = urllib.urlencode(values)
url = "https://passport.csdn.net/account/login?from=http://my.csdn.net/my/mycsdn"
request = urllib2.Request(url,data)
response = urllib2.urlopen(request)
print response.read()

import urllib
import urllib2

values={}
values['username'] = "1016903103@qq.com"
values['password']="XXXX"
data = urllib.urlencode(values)
url = "http://passport.csdn.net/account/login"
geturl = url + "?"+data
request = urllib2.Request(geturl)
response = urllib2.urlopen(request)
print response.read()

import urllib
import urllib2

url = 'http://www.server.com/login'
user_agent = 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)'
values = {'username' : 'cqc',  'password' : 'XXXX' }
headers = { 'User-Agent' : user_agent }
data = urllib.urlencode(values)
request = urllib2.Request(urldata, headers)
response = urllib2.urlopen(request)
page = response.read()