实验目的与要求：
 * Python运行环境的安装
 * 交互式运行Python
 * Python编辑器安装
 * 编辑、运行Python程序

实验步骤：

 * 在 http://www.python.org/ 上下载python安装程序安装Python
 * 在 http://www.pygame.org/ 上下载pygame安装程序安装pygame
 * 运行Python解释器，输入一些Python语句并查看运行结果。比如：
{{{
>>> 1+1
>>> 2**10
>>> r = 5
>>> pi = 3.14159
>>> pi*r*r
>>>
>>> "hello world"
>>> print "hello world"
>>> "hello " + "world\n"
>>> print "hello " + "world\n"
>>> 
>>> x = 54
>>> y = 36
>>> if x>y:
        print x
    else:
        print y
>>>
>>> while y != 0:
        y, x = x%y, y
>>> print x
>>>
>>> import sys
>>> sys.version
>>> sys.platform
>>> 

>>> shoplist = ['apple', 'mango', 'carrot', 'banana']

>>> print 'I have', len(shoplist),'items to purchase.'

>>> print 'These items are:', # Notice the comma at end of the line
>>> for item in shoplist:
>>>     print item,

>>> print '\nI also have to buy rice.'
>>> shoplist.append('rice')
>>> print 'My shopping list is now', shoplist

>>> print 'I will sort my list now'
>>> shoplist.sort()
>>> print 'Sorted shopping list is', shoplist

>>> print 'The first item I will buy is', shoplist[0]
>>> olditem = shoplist[0]
>>> del shoplist[0]
>>> print 'I bought the', olditem
>>> print 'My shopping list is now', shoplist

>>> help()
>>> help(sys)
>>> dir(sys)
>>> (Ctrl+d或者ctrl+z)
}}}
 * 下载安装一种Python编辑器，并熟悉它的使用。（比如SPE - Stani's Python Editor, IDLE, DrPython, Eclipse+PyDev, Boa Constructor,Emacs, VIM等）
 * 运行编辑器，编辑一段Python代码，并运行它。比如
{{{#!python
def GCD(x,y):
    while y != 0:
        y, x = x%y, y
    return x

print GCD(36, 54)
}}}
或者
{{{#!python
def buildConnectionString(params):
    """Build a connection string from a dictionary of parameters.

    Returns string."""
    return ";".join(["%s=%s" % (k, v) for k, v in params.items()])

if __name__ == "__main__":
    myParams = {"server":"mpilgrim", \
                "database":"master", \
                "uid":"sa", \
                "pwd":"secret" \
                }
    print buildConnectionString(myParams)
}}}
 * 在 http://www.pygame.org/projects/6 下载一个Python游戏并运行它。

思考题：
 * 在一个python语句的最前面或者最后面增加或者减少空格，对程序有没有影响？
 * 除了在主流的操作系统（Windows, Linux等）上运行Python程序，还可以在什么平台上运行Python程序？尝试一下。