Python base (B) - the basic data type (list, tuple, dictionary)

First, a list of

1.1, the format of the list

Any type can be nested list, in parentheses, "" dividing each element in the list of elements can be numbers, strings, lists, Boolean can go into all ..

li = [1, 12, 9, "age", ["aaa", ["19", 10], "bbb"], "ccc", False]

= [11, 22, 33, 22, 44]

1.2, the list of methods

. 1) the append ()   ==> added to the end of the original value, the parameter must iterables

li = [1, 2, 3, 4]
li.append(5)
li.append("abc")
li.append([1234, 2323])
print(li)   #[1, 2, 3, 4, 5, 'abc', [1234, 2323]]

2) the Clear ()    ==> Clear List

li = [1, 2, 3, 4] 
li.clear () 
print (li) # []

. 3) Copy ()    ==> shallow copy

li = [1, 2, 3, 4] 
v = li.copy () 
print (v) # [1, 2, 3, 4]

. 4) COUNT ()    number ==> element appears calculated

li = [1, 2, 3, 4, 1] 
v = li.count (1) 
print (v) # 2

5) Extend ()    ==> extended the original list of parameters: iterables

# Using the append 
Li = [. 11, 22 is, 33 is, 22 is, 44 is] 
li.append ([ "AA", "BB"]) 
Print (Li) # [. 11, 22 is, 33 is, 22 is, 44 is, [ 'AA' , 'bb']] # nested list 

# using Extend 
Li = [. 11, 22 is, 33 is, 22 is, 44 is] 
li.extend ([55, "AA"]) # [. 11, 22 is, 33 is, 22 is, 44 is, 55, 'aa'] # a list of 
print (li)

. 6) index ()    ==> value obtained in accordance with the current value of the index position (left priority)

li = [11, 22, 33, 22, 44] 
v = li.index (22) 
print (v) # 1

. 7) INSERT ()    ==> insertion element at the specified index

= [11, 22, 33, 22, 44] 
li.insert (0,99) 
print () # [99, 11, 22, 33, 22, 44]

8) POP ()    ==> Delete a value (1. Specify the index; 2 default last), and get the value of the deleted

li = [11, 22, 33, 22, 44] 
v = li.pop () 
print (li) # [11, 22, 33, 22] 
print (v) # 44 

li = [11, 22, 33, 22 44] 
v = li.pop (1) 
print (li) # [11, 33, 22, 44] 
print (v) # 22

9) the Remove) (    ==> delete the specified value list, left priority

= Li [. 11, 22 is, 33 is, 22 is, 44 is] 
li.remove (22 is) 
Print (Li) # [. 11, 33 is, 22 is, 44 is] 

# delete list Method: 
#pop Remove del Li [0] del Li [. 7 : 9] clear

10) the Sort ()    Sort ==> list

it = [11.44, 22, 33, 22] 
li.sort () # [11, 22, 22, 33, 44] 
li.sort (reverse = True) # [44, 33, 22, 22, 11] 
print (you)

1.3, the list of values

1) index value

li = [11.44, 22, 33, 22] 
print (li [3]) # 33

2) cut, sliced ​​the result is a list of

li = [11.44, 22, 33, 22] 
print (li [2: -1]) # [22, 33]

3) while or for loop

for item in li:
    print(item)