How do i make a registration form whic stores useres data in .txt file in python? - forms

Question

I am working on a project which I am spouse to create a Bank system using python. I have done the program and it works perfectly the only problem that I need help with is that how to create a registration form which will store user data for sign up, and read data for login from a txt file.
=
balance = 100
def log_in():
tries = 1
allowed = 5
value = True
while tries < 5:
print('')
pin = input('Please Enter You 4 Digit Pin: ')
if pin == '1234':
print('')
print(" Your Pin have been accepted! ")
print('---------------------------------------------------')
print('')
return True
if not len(pin) > 0:
tries += 1
print('Username cant be blank, you have,',(allowed - tries),'attempts left')
print('')
print('---------------------------------------------------')
print('')
else:
tries += 1
print('Invalid pin, you have',(allowed - tries),'attempts left')
print('')
print('---------------------------------------------------')
print('')
print("To many incorrect tries. Could not log in")
ThankYou()
def menu():
print (" Welcome to the Python Bank System")
print (" ")
print ("Your Transaction Options Are:")
print ("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~")
print ("1) Deposit Money")
print ("2) Withdraw Money")
print ("3) Check Balance")
print ("4) Quit Python Bank System.pyw")
def option1():
print (' Deposit Money' )
print('')
print("Your balance is £ ",balance)
Deposit=float(input("Please enter the deposit amount £ "))
if Deposit>0:
forewardbalance=(balance+Deposit)
print("You've successfully deposited £", Deposit, "into your account.")
print('Your avalible balance is £',forewardbalance)
print('')
print('---------------------------------------------------')
service()
else:
print("No deposit was made")
print('')
print('---------------------------------------------------')
service()
def option2():
print (' Withdraw Money' )
print('')
print("Your balance is £ ",balance)
Withdraw=float(input("Enter the amount you would like to Withdraw £ "))
if Withdraw>0:
forewardbalance=(balance-Withdraw)
print("You've successfully withdrawed £",Withdraw)
print('Your avalible balance is £',forewardbalance)
if Withdraw >= -100:
print("yOU ARE ON OVER YOUR LIMITS !")
else:
print("None withdraw made")
def option3():
print("Your balance is £ ",balance)
service()
def option4():
ThankYou()
def steps():
Option = int(input("Enter your option: "))
print('')
print('---------------------------------------------------')
if Option==1:
option1()
if Option==2:
option2()
if Option==3:
option3()
if Option==4:
option4()
else:
print('Please enter your option 1,2,3 or 4')
steps()
def service():
answer = input('Would you like to go to the menu? ')
answercov = answer.lower()
if answercov == 'yes' or answercov == 'y':
menu()
steps()
else:
ThankYou()
def ThankYou():
print('Thank you for using Python Bank System v 1.0')
quit()
log_in()
menu()
steps()
I expect my program to have a registration form which will store user data for sign up and read data for login from a .txt file.

Answer 1

So I looked a bit on it, and tried to do it with a .txt file.
So, in the same folder as the .py file, create the data.txt file like this one:
1234 1000.0
5642 500
3256 50.0
6543 25
2356 47.5
1235 495
1234 600000
The PIN and the balance are separated by a tabulation.
Then in the code, first step is to use global variable to pass on both the PIN number, the balance, and the path to the data file. Then, the data file is open, and the balance and pin are placed into 2 lists.
If you want to work with a dataframe, for instance panda, a dictionnary structure would be more relevant.
# Create the global variable balance and pin that will be used by the function
global balance
global pin
# Path to the data.txt file, here in the same folder as the bank.py file.
global data_path
data_path = 'data.txt'
data = open("{}".format(data_path), "r")
# Create a list of the pin, and balance in the data file.
pin_list = list()
balance_list = list()
for line in data.readlines():
try:
val = line.strip('\t').strip('\n').split()
pin_list.append(val[0])
balance_list.append(val[1])
except:
pass
# Close the data file
data.close()
""" Output
pin_list = ['1234', '5642', '3256', '6543', '2356', '1235', '1234']
balance_list = ['1000', '500', '-20', '25', '47.5', '495', '600000']
"""
Then, every function modifying the balance need to change the global variable value. For instance:
def log_in():
global balance
global pin
tries = 1
allowed = 5
while tries < 5:
pin = input('\nPlease Enter You 4 Digit Pin: ')
if pin in pin_list:
print('\n Your Pin have been accepted! ')
print('---------------------------------------------------\n')
balance = float(balance_list[pin_list.index(pin)])
menu()
else:
tries += 1
print('Wrong PIN, you have {} attempts left.\n'.format(allowed - tries))
print('---------------------------------------------------\n')
print('To many incorrect tries. Could not log in.')
ThankYou()
Or:
def option1():
global balance
print (' Deposit Money\n')
print('Your balance is £ {}'.format(balance))
deposit = float(input('Please enter the deposit amount £ '))
if deposit > 0:
balance = balance + deposit
print("You've successfully deposited £ {} into your account.".format(deposit))
print('Your avalible balance is £ {}\n'.format(balance))
print('---------------------------------------------------')
service()
else:
print('No deposit was made. \n')
print('---------------------------------------------------')
service()
Others sources of improvement:
Instead of print ('') to skip a line, simply add '\n' to the printed string.
Use 'blabla {}...'.format(value to put in {}) to place values, or str, or whatever in the middle of a str. It's good to use it since you will be able to place multiple values in the same string. Illustration in the saving data part bellow.
Finally, the new balance must be save in the .txt file. This will be done in the Thank you function:
def ThankYou():
global balance
global pin
global data_path
balance_list[pin_list.index(pin)] = balance
data = open("{}".format(data_path), "w")
for i in range(len(pin_list)):
line = '{}\t{}\n'.format(str(pin_list[i]), str(balance_list[i]))
data.write(line)
data.close()
print('Thank you for using Python Bank System v 1.0')
quit()
I hope you get the idea, and can manage on your own the code modifications, you should have every key to do it.
Good luck !