isinstance()和__name__

 1 # coding: utf-8
 2 
 3 def displayNumType(num):
 4     print num, ‘is‘,
 5     if isinstance(num, (int, long, float, complex)):      # 如果变量num的值为元组(int, long, float, complex)中的一个，则运行此if块
 6         print ‘a number of type:‘, type(num).__name__     # 打印‘a number of type:‘, 变量num的类名
 7     else:
 8         print ‘not a number at all!!‘
 9         
10 displayNumType(-69)
11 displayNumType(99999999999999999999999999999L)
12 displayNumType(98.6)
13 displayNumType(-5.2+1.9j)
14 displayNumType(‘xxx‘)