day85-Django acquaintance - web framework to develop their own

# The following is the development of its own web framework: 
# 1. 
#    Http, stateless, short connection 
# 2 
#    Browser (socket client) 
#    website (socket server) 
# 3 
#    to write their own website 
#        a.socket Service end 
#        . b routing system: 
#                according to different URL to return different content 
#                URL -> function 
#        c string returned to the user. 
#                template rendering engine (replace): 
#                HTML serves as a template (special characters) 
#                create their own arbitrary data 
# 4. 
# the Web frame types: 
#         - A, B, C -> the Tornado 
#        - [Third Party A -> the wsgiref], B, C -> the Django 
#         - [Third Party a -> wsgiref], b, [ third party c -> jinja2] -> flask ,

import socket
import pymysql
def f1(request):
    Open with ( ' form.html ' , ' R & lt ' , encoding = ' UTF-. 8 ' ) AS F: # RB specify the encoding parameter is not supported during operation 
        Content = reached, f.read ()
     return Content

def f2(request):
    with open('table.html','r',encoding='utf-8') as f:
        content = f.read()
    import random
    Age The = randomrandint (over 1,100 ),
    content = content.replace('@@age@@',str(age))
    return content

DEF F3 (Request):
     # 1. acquired data database 
    Conn = pymysql.connect (Host = ' localhost ' , Port = 3306, = User ' the root ' , password = ' 123 ' , Database = ' DB1 ' , charset = ' UTF8 ' )
    Cursor = conn.cursor (Cursor = pymysql.cursors.DictCursor) # result acquisition dictionary is 
    the cursor.execute ( ' SELECT ID, username, password from UserInfo ' )
    user_list = cursor.fetchall () # acquiring all the data, the dictionary is the list elements inside 
    Print (user_list) # [{ 'ID':. 1, 'username': 'Tom', 'password': '111'}, { ' id ': 2,' username ' :' marry ',' password ':' 222 '}, {' id ': 3,' username ':' jack ',' password ':' 333 '}, {' id ' : 10, 'username': 'Alex', 'password': '555'}, { 'ID':. 11, 'username': 'Tommy', 'password': '777'}] 
    cursor.close ()
    conn.close()

    # 2. The data row on the inside to give row_list, it is a list, which elements are strings 
    row_list = []
     for dict in user_list:
        row = '<tr><td>%s</td><td>%s</td><td>%s</td></tr>'%(dict['id'],dict['username'],dict['password'])
        row_list.append(row)
    print(row_list)

    # 3 listing splicing with null character, to give a string row_str 
    row_str = '' .join (row_list)
     Print (row_str)

    # 4. Open table1.html, read the contents, the replacement of tbody @@ row @@ into row_str, and finally returned to the browser. 
    Open with ( ' table1.html ' , ' R & lt ' , encoding = ' UTF-. 8 ' ) AS F:
        content = f.read()
    content = content.replace('@@row@@',row_str)
    print(content)
    return content

def f4(request):
    conn = pymysql.connect(host='localhost',port=3306,user='root',password='123',database='db1',charset='utf8')
    Cursor = conn.cursor (Cursor = pymysql.cursors.DictCursor) # result acquisition dictionary is 
    the cursor.execute ( ' SELECT ID, username, password from UserInfo ' )
    user_list = cursor.fetchall()
    cursor.close()
    conn.close()

    with open('table2.html','r',encoding='utf-8') as f:
        content = f.read()

    # Template-based rendering (replace) third-party tools to achieve 
    from jinja2 Import Template
    Template = Template (Content) # the html content of the read parameter passing, to give the object instantiated 
    Content = template.render (user_list = user_list)
     return Content

URL_LIST = [( ' /form.html ' , F1), ( ' /table.html ' , F2), ( ' /table1.html ' , F3), ( ' /table2.html ' , F4)] # may request the url 
DEF RUN ():
    sk = socket.socket()
    sk.bind(('127.0.0.1',8999))
    sk.listen(10)

    while True:
        conn,addr = sk.accept()
        Data = conn.recv (1024) .decode ( ' UTF-. 8 ' ) # reception request. If not decoded, there are many data obtained newline \ r \ n, can clearly see the structure 
        # Print (data) 
        header, body data.split = ( ' \ R & lt \ n-\ R & lt \ n- ' ) # request header, and responsive member is separated by two newline 
        header_item = header.split ( ' \ R & lt \ n- ' ) # requested content with header which is a newline separated, to obtain a list 
        # Print (header_item) 
        gET, URL, HTTP header_item = [0] .split ( '  ' ) # first request header element is separated by a space 

        conn.send (B ' the HTTP / 1.1 OK 200 is \ R & lt \ n-\ R & lt \ n- ' ) #http protocol 
        # routing system: url relationship with functions, depending url, return different content 
        for Item in URL_LIST:
             IF Item [0] == url: # If the url is the 
                RET = Item [. 1] (Data) # pass the request to put the function parameters, return value to get 
                conn.send (ret.encode ( ' UTF-. 8 ' ))
                 BREAK 
        the else :
            conn.send(b'404 not found')

        conn.close()
if __name__ == '__main__':
    run()