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Python Variable names are case sensitive , for example ：name and Name Just two variable names , Not the same variable .
variable (variable) It's learning python Initial time , Will come into contact with a new knowledge point , It is also a concept that needs to be familiar with .python Is a dynamically typed language , Different types of values can be bound during the execution of assignment , This process is called variable assignment , The assignment also determines the type of variable .
What are variables
stay python Many data will be used in the learning process , That's for easy operation , These data need to be represented by a simple name , It is convenient to refer to in the next program . A variable represents some data ( value ) Name of .
python How do variable assignments define operations
The variable definition method is simple ：1>>> x = 5
This operation is assignment , Integer number 5 Assigned to variable x, Use an equal sign to connect variable names and values . Then you can use the new variable in the expression .1
2>>> x * 3
15
be careful ： During assignment , What data type is the value , Determines the type of this variable , The variable name refers to both the value and its type .
Variable naming convention
1, Variable names can include letters , number , Underline , But you can't start with a number . for example ：name1 Is a valid variable name , and 1name You can't .
2, System keywords cannot be used as variable names
3, Except underline , Other symbols cannot be used as variable names