python小点心--compile

函数原型： compile(source, filename, mode[, flags[, dont_inherit]])

       简单讲，就是把source编译成可执行的代码

       比如有一个python脚本compileDemo1.py，内容为：

#coding=utf-8
'''
Created on 2016-2-16

@author: Administrator
'''

addr = '192.168.1.1'
print addr

        那么我们可以在目录下新建一个脚本，内容为:

#coding=utf-8
'''
Created on 2016-2-16

@author: Administrator
'''

filepath = './compileDemo1.py'
with open(filepath, 'r') as f:    
    text = f.read()
    
c = compile(text,'success','exec')   # 编译为字节代码对象  
exec c

        这时，就会打印出192.168.1.1

compileDemo1.py

        新建脚本compileDemo3.py,内容为:

#coding=utf-8
'''
Created on 2016-2-16

@author: Administrator
'''

class Test():
    def myprint(self):
        print 'ok'
    
    
def fun():
    print 'fun'
    
if __name__ == '__main__':
    print 'main'

       在目录下新建一个脚本，内容为:

#coding=utf-8
'''
Created on 2016-2-16

@author: Administrator
'''

filepath = './compileDemo3.py'
with open(filepath, 'r') as f:    
    text = f.read()
    
c = compile(text,'success','exec')   # 编译为字节代码对象  
exec c in globals()

ind_obj = globals()['Test']()
ind_obj.myprint()
globals()['fun']()

       运行脚本，会调用compileDemo3.py中的fun函数，生成了一个Test的对象并调用myprint方法

       exec c in globals()这条语句很关键，它将编译好的类和函数存入到了全局变量，这样，通过globals就可以访问他们