A variable type

'' '
Why variable values (ie data records) to distinguish between type it?
Variable value used to record the state of affairs, and the state of things
are various, it should correspond with different types of values
to record the state
'' '

1, the string type

Action: recording status descriptive 
Definition: '' , '' , '' '' '' , "" "" "" comprises a string of characters in the 
name = ' Egon ' 
line string: '' , "" 
multi-line string: '' '' '' , "" "" "" 
MSG = "" " 
AAAA 
bbbb 
CCC 
" "" 
outer layer single quotes, inner layer should be enclosed in double quotes 
info = ' My name IS "Egon" ' 
Print (info)

 

2, integer

Role: Record age, number 
defined way: 
Age = 18

 

3, float

Action: height records, payroll, weight 
defined method: 
the salary = 3.1 
height = 1.75 
weight = 73.1

 

4, list (stored plurality of values ​​corresponding to the index value, the index represents a position)

Action: in the order of storing a plurality of values, and the value can be taken in the order specified position 
defined: within [], separated by commas more of any type of value 
L = [ ' AAA ' , 10, 11.11, [ ' BBB ' , ' CCC ' ], ' ddd ' ] 

index starts from 0 
Print (L [0])
 Print (L [2 ]) 

reverse takes 
Print (L [-1 ])
 Print (L [-2 ])
 Print ( L [. 3] [. 1 ]) 

record the name of the class person 
school_names = "" " 
Tie egg Maruko 
King cannon 
Li scrape 
" "" 
school_names = [ "Li Tie egg small ball ' , ' King cannon ' , ' Lee Cha Cha ' ]
 Print (school_names)

 

5, a dictionary: a plurality of stored values, corresponding to the key value, usually descriptive function key should have a value, key string type usually

Definition: {}, separated by commas plurality of key: value element 
DIC = { ' XX ' : 111, ' yyy ' : 222 }
 Print (DIC [ ' XX ' ])
 Print (DIC [ ' yyy ' ]) 

info = {
 " name " : ' Egon ' ,
 " Age " : 18 is ,
 " Sex " : ' MALE ' ,
 " the salary " :. 1.75
}
print(info["age"])


salaries=[11.1,22.222]

print(salary[0])