如何用一个输入创建不同的条件 (python)

Question

谁能帮我写代码？

我想将 RFID 卡数据插入 MySQL 数据库。当我第一次点击 RFID Reader 上的标签时，程序会将数据插入 Masuk table 当我再次点击标签时，程序会将数据插入 Keluar table.

我用这段代码做对了吗？

import MFRC522 
import signal
import time
import MySQLdb
import datetime

db = MySQLdb.connect(host='localhost',
                user='root',
                passwd='12345678',
                db='pa')<br>
cursor = db.cursor()

continue_reading = True
MIFAREReader = MFRC522.MFRC522()

cardA = [131,89,173,1,118]

def read ():
    read = 1

def end_read(signal, frame):


global continue_reading
  continue_reading = False
  print "Ctrl+C captured, ending read."
  MIFAREReader.GPIO_CLEEN()

signal.signal(signal.SIGINT, end_read)

while continue_reading:
  (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)
  if status == MIFAREReader.MI_OK:
    print "Card detected"
  (status,backData) = MIFAREReader.MFRC522_Anticoll()
  if status == MIFAREReader.MI_OK:
    print "Card read UID: "+str(backData[0])+""+str(backData[1])+""+str(backData$
    if backData == cardA:
        print "Selamat Datang Dheny"
        if (read == True):
            sql = """ INSERT INTO Masuk(Nama, No_ID, datetime) VALUES ('Dheny', $
        try:
            cursor.execute(sql)
            db.commit()
        except:
            db.rollback()
        read = False
        if (read == False):
                sql = """ INSERT INTO Keluar(Nama, No_ID, datetime) VALUES ('Dhe$
        try:
            cursor.execute(sql)
            db.commit()
        except:
            db.rollback()
        read = True

Answer 1

你只需要像 this.create 这样的全局变量（计数）来实现 if and elif 条件下的行为，例如

  if (count==True):
      # insert into musak and update count to false
  elif(count==False):
      # insert into other table and update count to True

我不知道您是否尝试使用 read 变量来实现该行为，如果是，那么它应该是全局的并且使用 elif 而不是 if 来只执行一个情况下，您需要像下面这样更改 read 的值。

  if (read == True):
    sql = """ INSERT INTO Masuk(Nama, No_ID, datetime) VALUES ('Dheny', $
    try:
        cursor.execute(sql)
        db.commit()
    except:
        db.rollback()
    global read     # Needed to modify global copy of read 
    globvar = False      # next time read==False case will be executed    
  elif (read == False):
    global read     # Needed to modify global copy of read 
    read = True        # next time read==True case will be executed        
    sql = """ INSERT INTO Keluar(Nama, No_ID, datetime) VALUES ('Dhe$
    try:
        cursor.execute(sql)
        db.commit()
    except:
        db.rollback()

Answer 2

查看代码访问和修改全局变量

global count 


def modi():
    global count # required to modify the global copy
    count=10

def printc():
    if (count==10): # read it as a normal variable 
        print("yes")


modi()
printc()

如何用一个输入创建不同的条件 (python)

how to make a different conditions with one input (python)

python

mysql

database

rfid

raspberry-pi