Python中exec的使用

>>>globals = {'x':7,
   .....: 'y':10,
   .....: 'names':['aa','bb','cc']
   .....: }
 
>>>locals = {}
 
>>>a = eval("3*x+4*y",globals,locals)
 
>>>print a
61
 
>>>exec("for i in names:    print i",globals,locals)
aa
bb
cc