Compare Two Group String,return Different Results

I run this command in python console: why the 2 results are different? >>>S1 = 'HelloWorld' >>>S2 = 'HelloWorld' >>>S1 is S2 True >>>S1 = 'Hello

Solution 1:

is the result will be true only if the object is the same object.

== will be true if the values of the object are the same.

>>>S1 = 'HelloWorld'>>>printid(S1)
4457604464
>>>S2 = 'HelloWorld'>>>printid(S2)
4457604464
>>>S1 is S2
True

The above code means S1 and S2 are same object.And they have the same memory location.So S1 is S2.

>>>S1 = 'Hello World'>>>S2 = 'Hello World'>>>printid(S1)
4457604320
>>>printid(S2)
4457604272
>>>S1 is S2
False

Now,they're different object,so S1 is not S2.