编程字典-Python id 运算符实例

python id 运算符

#!/usr/bin/python

a = 20

b = 20

if ( a is b ):

  print "Line 1 - a and b have same identity"

else:

  print "Line 1 - a and b do not have same identity"

if ( id(a) == id(b) ):

  print "Line 2 - a and b have same identity"

else:

  print "Line 2 - a and b do not have same identity"

b = 30

if ( a is b ):

  print "Line 3 - a and b have same identity"

else:

  print "Line 3 - a and b do not have same identity"

if ( a is not b ):

  print "Line 4 - a and b do not have same identity"

else:

  print "Line 4 - a and b have same identity"

更多实例：http://codingdict.com/article/19147