Today i started learning Python. I had first program. After finish, i learned:
print number, string, format etc
function
local and global variable
read file
string find index and substring

And now, this is my first program:

#Author: Namhb

#Email: namhb@gmail.com

#Program: Demo1

#Version: 0.1

#############################################
##### Start program

##### Lib
import getpass
##### Global Variable
userfile = "user.txt"
userc = ""
rolec = ""
logined = False
failcount = 0
maxfail = 3
##### Function
def menu():
print "+---------------------------------------------+"
print "+ +"
print "+ Demo Python Program +"
print "+ namhb@gmail.com +"
print "+ +"
print "+---------------------------------------------+"

def checklogin(user, passwd):
f = file(userfile)
check = False
while True:
line = f.readline()
if len(line) == 0:
break
u_end = line.index(":")
u = line[0:u_end]
p_end = line.index(":",u_end+1)
p = line[u_end+1:p_end]
r = line[p_end+1:len(line)-1]
if user == u and passwd == p :
check = True
break
if check == True:

Set cookie

global userc, rolec, logined
userc = user
rolec = r
logined = True
f.close()

def login():
print "Login"
username = raw_input("Username: ")
password = getpass.getpass()
print "Loading: user %s with password in %s" %(username,userfile)
checklogin(username, password)
if logined == True:
print "Login successfully"
print "Hello %s - %s" %(userc, rolec)
else:
global failcount
failcount += 1
print "Login failed, you have %d to try again" %(maxfail - failcount)
if (maxfail - failcount) > 0:
login()
else:
exit()

##### Main
menu()
login()

And user.txt file:
namhb:123456:admin
linh:123456:user

------------------------------------------------------------
Thanks for reading
--------------------------------------------------------------------------
Security Research
All my Lab:
Linux Lab -- window and Cisco Lab
to be continued - I will update more.

Nam Habach