declare variable
# Author :yanpengtao
# _*_coding:utf-8_*_
name = "Yanpengtao"
print("My name is :", name)
C: \ day1 \ venv \ Scripts \ python.exe G: /PythonStudy/S14/day1/var.py My name is : Yanpengtao
The above code declares a variable, the variable name is: name, the value of the variable name is: "Yanpengtao", and the variable is output as "Yanpengtao"
Rules for variable definition:
- Variable names can only be any combination of letters, numbers or underscores
- The first character of a variable name cannot be a number
- The following keywords cannot be declared as variable names
['and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else', ' except', 'exec', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'not', 'or' , 'pass', 'print', 'raise', 'return', 'try', 'while', 'with', 'yield']
Assignment of variables:
# Author :yanpengtao
# _*_coding:utf-8_*_
name = "Yanpengtao"
print("My name is :", name)
name2 = name
print("name is :", name, "name2 is :", name2)
name = "Fengjie"
print("name is :", name, "name2 is :", name2)
C: \ day1 \ venv \ Scripts \ python.exe G: /PythonStudy/S14/day1/var.py My name is : Yanpengtao name is : Yanpengtao name2 is : Yanpengtao name is : Fengjie name2 is : Yanpengtao
The above code first defines the name variable, assigns the value to "Yanpengtao", and then assigns the name to name2. At this time, the values of name and name2 are the same, and then the value of name is changed to "Fengjie". At this time, the output name is " Yanpengtao", and the name is still "Yanpengtao", so what's going on, the following analysis:
