keypad password matching.py

import RPi.GPIO as io
import time
from time import sleep
io.setwarnings(False)

io.setmode(io.BOARD)

password="9567"
count=0
c1=3
c2=5
c3=7
r0=8
r1=10
r2=11
r3=12
b=""

io.setup(c1,io.IN,io.PUD_UP)
io.setup(c2,io.IN,io.PUD_UP)
io.setup(c3,io.IN,io.PUD_UP)
io.setup(r0,io.OUT)
io.setup(r1,io.OUT)
io.setup(r2,io.OUT)
io.setup(r3,io.OUT)

#io.setup(c1,io.HIGH)

#io.setup(c2,io.HIGH)
#io.setup(c3,io.HIGH)


print 'enter password'
def readKey():
        io.output(r0,0)
        io.output(r1,1)
        io.output(r2,1)
        io.output(r3,1)
        if(io.input(c1)==0):
                sleep(0.5)
                return'1'
               
        if(io.input(c2)==0):
                sleep(0.5)
                return'2'
        if(io.input(c3)==0):
                sleep(0.5)
                return'3'
        io.output(r0,1)
        io.output(r1,0)
        io.output(r2,1)
        io.output(r3,1)
        if(io.input(c1)==0):
                sleep(0.5)
                return'4'
               
        if(io.input(c2)==0):
                sleep(0.5)
                return'5'
        if(io.input(c3)==0):
                sleep(0.5)
                return'6'
        io.output(r0,1)
        io.output(r1,1)
        io.output(r2,0)
        io.output(r3,1)
        if(io.input(c1)==0):
                sleep(0.5)
                return'7'
               
        if(io.input(c2)==0):
                sleep(0.5)
                return'8'
        if(io.input(c3)==0):
                sleep(0.5)
                return'9'
        io.output(r0,1)
        io.output(r1,1)
        io.output(r2,1)
        io.output(r3,0)
        if(io.input(c1)==0):
                sleep(0.5)
                return'*'
               
        if(io.input(c2)==0):
                sleep(0.5)
                return'0'
        if(io.input(c3)==0):
                sleep(0.5)
                return'#'
        return'o'    
       
def  nfun():
        key='o'
        while(key=='o'):
                key=readKey()
        
        return key
        continue    
while True:     
    
        while(count<4):

                a=nfun()
                b=b+a
                count+=1

                print b

        if(b==password):
                print("password unlocked")
                print("now you are logg in")
                break
        elif(b!=password) :
                print("wrong password")
                print("Retry")
                break