python&int&method&string slices, indexes, lists, Ganso, dictionaries

I. Two methods of INT

A

__ADD__ ()

Bit_length ()

Number_one = 7
Number_two = 5
Print (Number_one + number_two)
Print (number_one.__add__ (number_two))
Print (Number_one.bit_length ())
Print (Number_two.bit_length ())

Effect:

12
12
3
3

Second, string index and slice

name = ' Jane '
Print (Name[0])
Print (name[1])
Print (Name[3])
Print (name[2])
Print (Name[0:4])

Effect:

J
A
E
N
Jane

Iii. list and some of his methods

A

Indexes and slices

Name_list = ["Jane", ' Jaymes ', ' Jackman ')
Print (name_list[0]) #索引
Print (Name_list[0:2])
Print (Name_list[0:len (name_list))) #切片

Effect:

Jane
[' Jane ', ' Jaymes ']
[' Jane ', ' Jaymes ', ' Jackman ']

B

Append ()

Effect: Add the rear of the butt

C

Count ()

Effect: View the number of occurrences of a member

D

Extend ()

Name_list = ["Jane", ' Jaymes ', ' Jackman ')

temp = [11, 22, 77]

Name_list.extend (temp)

Print (name_list)

Effect: [' Jane ', ' Jaymes ', ' Jackman ', 11, 22, 77]

E

Index ()

Name_list = [' Jane ', ' Jaymes ', ' Jackman ']

Print (Name_list.index (' Jane '))

Effects: Viewing the index in which an element appears

F

Insert ()

Effect: You can specify an index to insert an element

G

Pop () #可以指定索引, can also not be specified, do not specify from the bottom to start deleting

Del Name_list[i]

Effect: spare tire and puncture

H

Reverse () #列表反转

Sort () #排序

Remove ()

Iv. Ganso

A

Only count () and index () are supported

Five, dictionary

A

Favorite_languages = {

' Jane ': ' Python ',

' Jack ': ' C + + ',

' Rose ': ' PHP ',

' Jaymes ': ' Java ',

}

For I in Favorite_languages:

Print (i)#默认输出key

B

Key: Favorite_languages.keys ()

Value: Favorite_languages.values ()

K&v:favorite_languages.items ()

For K, V in Favorite_languages ():

Print (k, v)

C

Get () #通过get () Gets the value

Favorite_languages (' Jane ') #输出Python

Favorite_languages (' Jen ') #输出None

Favorite_languages (' Jen ', ' python ') output Python

D

Clear () #空字典了

E

ret = ' Jane ' in Favorite.keys ()

Print (ret)

F

Favorite_languages.pop (' Jane ')

Favorite_langugaes.popitem ()

G

Del favorite_languages[i]# puncture

H

Dictionary update () with extend ()

I

Favorite = [' Football ', ' iPhone ', ' cute ', ' MacBook Pro ']
For key, value in enumerate (favorite, 1):
    Print (key, value)

ret = input (' Please enter your numbers: ')
Print (Favorite[int (ret)-1])

J

Add

PY 2.7

Range (0, $) #一下全部创建出来

Xrange (0, #只能通过for循环才能输出)

PY 3

Range (1, one) # can only be output with a for loop

Range (10, 0,-1)

Name_list = [' Jane ', ' Jen ', ' Lee ', ' Brouse ', ' Rudy ']

For I in range (0, Len (name_list)):
    Print (i + 1, name_list[i])

python&int&method&string slices, indexes, lists, Ganso, dictionaries