On the difference between list generation and generator in Python

List-generated syntax:

[X*x for X in range (0,10)]//list generation, here is the bracket//result [0, 1, 4, 9, +, +, +, $,, Bayi] (x*x for X in range (0,10))//generator, here is the parenthesis Results 
 
  at 
 
  
   0x7f0b072e6140>
 
 

The difference between the two is obvious:
One directly returns the result list of the expression, and the other is an object that contains a computed reference to the result of the expression, which can be directly output through a loop

g = (x*x for x in range (0,10)) for N in G:  print N

Results

0149162536496481

When the number of results of an expression is small, the use of list generation is OK, once the order of magnitude is too large, then the list generation will occupy a lot of memory,
Instead of immediately writing the results to memory, the generator is a method of saving, which is used to obtain the value of the corresponding position by constant acquisition, so the memory occupied is only the saving of the calculated object.

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