Python learning basics - a detailed introduction to variables and assignments

Variables: The program will use a lot of temporary storage data when it is running. At this time, variables and the names of temporary data are used.

#Variables in Python do not need to be declared and can be used directly. The data type of the variable is determined by assignment.

>>> name="like"
>>> name
'like'
>>> age = 35
>>> name,age
('like', 35)

Use the type command to view the type of the variable:

>>> type(name)
<class &#39;str&#39;>
>>> type(age)
<class &#39;int&#39;>
>>> print(name,age)
like 19

The variable stores not the assigned data, but the address where the data is located ( The address is not the address of the memory), the id can check the address of the variable

>>> a = 3
>>> b = a
>>> id(a),id(b)
(1661927952, 1661927952)
>>> a = 5
>>> id(a),id(b)
(1661928016, 1661927952)

Variable naming rules

1. Explicit, easy to understand .

2. Variable name can only be a combination of letters, underscores, and numbers. Numbers cannot begin, and cannot contain -!@#$%^&*() and other special symbols.

For example: nums_of_alex_gf = 19

            NumsOfAlexGf = 19

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