Basic 02: variable, remember the mobile number of the object

Variable ： Remember the phone number of the object

In life ：

Mail list ： Find the person's name （ label ）, Find the mobile number again .

greet=" Hello! , Did you have your meal? ？"
greet_chinese=greet;
greet_english=greet;
print(" Hello! , Did you have your meal? ？"+" Zhang San ")
print(" Hello! , Did you have your meal? ？"+" Li Si ")
print(greet+" Wang Wu ")
print(greet+" Xue Ba ")

Underline nomenclature

1. The letters are all lowercase

2. Different words are underlined

user_name

Case sensitive : user_age ≠ user_Age

Don't take Python Key words of