| 操作符 | 描述 | 範例 |
|---|---|---|
| is |
如果操作符兩側的變數是相同的物件計算結果為true，否則返回 false
|
x is y,如果 id(x) 等於 id(y) ，則結果為1 |
| is not | 如果操作符兩側的變數不是相同的物件計算結果為true，否則返回 false | x is y,如果 id(x) 不等於 id(y) ，則結果為1 |
#!/usr/bin/python3
a = 20
b = 20
print ('Line 1','a=',a,':',id(a), 'b=',b,':',id(b))
if ( a is b ):
print ("Line 2 - a and b have same identity")
else:
print ("Line 2 - a and b do not have same identity")
if ( id(a) == id(b) ):
print ("Line 3 - a and b have same identity")
else:
print ("Line 3 - a and b do not have same identity")
b = 30
print ('Line 4','a=',a,':',id(a), 'b=',b,':',id(b))
if ( a is not b ):
print ("Line 5 - a and b do not have same identity")
else:
print ("Line 5 - a and b have same identity")
Line 1 a= 20 : 1594701888 b= 20 : 1594701888 Line 2 - a and b have same identity Line 3 - a and b have same identity Line 4 a= 20 : 1594701888 b= 30 : 1594702048 Line 5 - a and b do not have same identity