python--the representation of computer memory in a variable

Finally, it is important to understand the representation of variables in computer memory. When we write:

a = ‘ABC‘

, the Python interpreter did two things:

1. A string is created in memory ‘ABC‘ ;

2. A variable named in memory is created a and pointed to ‘ABC‘ .

You can also assign a variable a to another variable, which actually refers to the data that the variable points to b b a , such as the following code:

‘ABC‘b = aa = ‘XYZ‘print b

The last line prints out b the contents of the variable. ‘ABC‘ ‘XYZ‘ If it is mathematically understood, it will be wrong to draw the b same, and it a should be ‘XYZ‘ , but b the actual value is ‘ABC‘ , let us execute the code in one line, we can see exactly what happened:

Execution a = ‘ABC‘ , the interpreter creates a string ‘ABC‘ and a variable a , and a points to ‘ABC‘ :

Executes b = a , the interpreter creates the variable b and points to b a the string that points to ‘ABC‘ :

Execute a = ‘XYZ‘ , the interpreter creates the string ' XYZ ' and puts a the pointer instead ‘XYZ‘ , but b does not change:

So, the b result of the last print variable is naturally ‘ABC‘ .

python--the representation of computer memory in a variable