Is there a specific way to code a database authentification for users of a program?

What your asking sound a lot like what Im making right now. here is what I have so far...

Note: If you run the program you will have to make some .txt file and change the directories.

import time

i = ""
fileContents = ""
#User 1
password1 = "hellomynameis"
username1 = "DragonMastur"
#User 2
password2 = "michael"
username2 = "aiden"
#User 3
password3 = "..........."
username3 = "..........."

line = "A line looks."

class Book:
    def readBook(self, line):
        print "Fetching Book..."
        file = open('/home/pi/BookFolder/book.txt', mode='r')
        time.sleep(1)
        print "Done"
        time.sleep(1)
        print "\n\n\n"
        while line != "":
            line = str(file.readline())
            print line
        print "\n\n\n"

    def readBook2(self, line):
        print "Fetching Book..."
        file = open('/home/pi/BookFolder/book2.txt', mode='r')
        time.sleep(1)
        print "Done"
        time.sleep(1)
        print "\n\n\n"
        while line != "":
            line = str(file.readline())
            print line
        print "\n\n\n"

    def readBook3(self, line):
        print "Fetching Book..."
        file = open('/home/pi/BookFolder/book3.txt', mode='r')
        time.sleep(1)
        print "Done"
        time.sleep(1)
        print "\n\n\n"
        while line != "":
            line = str(file.readline())
            print line
        print "\n\n\n"

    def __init__(self):
        i = "Input from the user."
        while True:
            print 'Enter Your Username: '
            u = raw_input()
            if u == username1 or u == username2 or u == username3:
                print "Enter Your Password: "
                p = raw_input()
                if p == password1 and u == username1 or p == password2
and u == username2 or p == password3 and u == username3:
                    while i != "q" or i != "Q":
                        print "-------Menu-------"
                        print "Look at book     1"
                        print "Quit             Q"
                        i = raw_input()
                        if i == "1":
                            if u == username1:
                                self.readBook(line)
                            elif u == username2:
                                self.readBook2(line)
                            elif u == username3:
                                self.readBook3(line)
                            else:
                                print "ERORR!!!!!!!!!!!!"
                        elif i == "q" or i == "Q":
                            quit(0)
                        else:
                            print "Sorry...That is not Avalible."
                else:
                    print "Incorrect password."
                    print "Q = Quit\nP = Try again."
                    i = raw_input()
                    if  i == "q" or i == "Q":
                            quit(0)
                    elif i != "P" or i != "p":
                        print "Sorry not avalible... Quiting..."
                        time.sleep(5)
                        quit(0)
            else:
                print "Incorrect Username."
                print "Q = Quit\nU = Try again."
                i = raw_input()
                if i == "q" or i == "Q":
                    quit(0)
                elif i != "u" or i != "U":
                    print "Sorry not avalible... Quiting..."
                    time.sleep(5)
                    quit(0)
                elif i == "u" or i == "U":
                    pass


if __name__ == "__main__":
    Book()
    print "Good Bye! See you later!"
    time.sleep(5)

Yes I have my username and password in there but that is for my raspberry pi. Not any of my other acounts.

Thank you for sharing that code you gave me an idea of what i can do.

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