3. Python variables

1, the variable Understanding (1) variable is a point to address the

>>> x=12>>> ID (x)3735132>>> y=x>>> ID (x)3735132

For variable x and variable y, their IDs are the same, that is, the variable is pointing to the address.

Memory holds the contents of x=12, x equals this value, that is, X points to this address and y = x, then y also points to this address. In other words, a variable, in fact, is similar to a pointer, although it is an assignment, but in fact is the pointer to the problem, and does not modify the current address of the saved content.

(2) Variable does not need to specify data type

>>> x=12>>> y=12.5>>> type (x)'int'>>>> type (y) ' float '>>>> z="qxj511">>> type (z)' Str '>

When initializing, you can use it directly, what type of assignment are you, what type,

3. Python variables