python basis of Chapter VIII: List

List

Declare an empty list

Variable = [] = variable or List ()

Declare a list with data

Variable = [value, value ......] = List or variables (data containers) (data type conversion is essentially)

The basic operation of the list:

By: the index can not be used directly add

Delete: del variable [index]

Change: Variable [Index] = new value

Charles: Variable [Index]

View

list1 = [ 'sun', 'chi', 'to', 'ah'] 
RES = List1 [0:. 3] 
Print (RES) 

modified

list1 = [ 'sun', 'chi', 'to', 'ah'] 
List1 [0:. 3] = [ 'sun', 'may'] 
Print (List1) 

increasing ( start value and end value must be the same, otherwise modify)

list1 = [ 'sun', 'chi', 'to', 'ah'] 
List1 [0: 0] = [ 'sun', 'may'] 
Print (List1) 

Delete

list1 = [ 'sun', 'chi', 'to', 'ah'] 
del List1 [0:. 3] 
Print (List1) 

correlation function list: 
the append (); add data to the list (added to the end surface) 
INSERT (): added before the specified index list data 
pop (): delete data at the specified index position in the list (the default when you remove the last hold data) 
the Remove (): Removes the specified data in the list 
clear (); clear the data 
count (): number of times calculation specified in the list data present 
Extend (): together the two lists, and "+" as the effect of 
reverse () inverted list 
sort (reverse = False): a sorted list (the default is ascending) 
index (); obtaining a value in the index list 
copy (): 
shallow copy: 
slicing the copy list [:] 
copy of the caller object: list.copy () 
call: copy.copy () (Note; import to guide package copy) 

deep copy: 
copy.deepcopy () (Note: Import leader packet copy) 

a listing of formula derived 
basic derivation 
result variable = [variables for variables in the container] 

derivation with a condition determination 
result = variable [variable for variables in Conditional expression container] 

Analyzing the former conditions
Outcome variable = [Conditional Expression variable interval value true else false value for the variable in the container section] 

multicycle listing derivation formula 
outcome variable = [Variable 1 Variable 2 for calculating a variable in the container 2 in the container for variable] 

Multi conditionally circulating derivations

Outcome variable = [Variable 1 Variable 2 for calculating a variable in the container 2 in the container for variable conditional expressions] 

list traversal 
for ...... container in 

the list having a penetrating

list1=[1,2,3,4]
def func():
    list1[0:]=[7,8,9]
    print(list1)
func()