### Assalam-u-alaikum, Everyone.
Hope y'all doing great. 
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![14.jpeg](https://cdn.steemitimages.com/DQmafixhzWdcHteznspEDcJCmFvNZ1G75GXNCWHdPKoxTSD/14.jpeg)

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I'll be building a basic logging system in python for beginners. We're gonna basically build a command line application. 
For this, You must have python version 3.9 or any other version downloaded. We'll be using an IDLE shell, so lets get started...
# Step 1 :
I have created a new folder and in that folder, I've created another text document and saved all the user details.
![1.jpeg](https://cdn.steemitimages.com/DQmfReaMTWo75ivohdoieSUTZr9BAqnERgeJYPQRs3UJ84m/1.jpeg)
Now, open your IDLE shell and start coding

![image.png](https://cdn.steemitimages.com/DQmd3U9DMszQpN8EGZr5Go3M5FuQa3JcniCGMKYFGWFiXWE/image.png)

# Step 2:
First, I have defined logging and register functions with name and password. And a begin function where I'll print the name of the application, I've also added an if condition.

    def login(name, password):
        pass

    def register(name, password):
        pass

    def begin():
        print("Welcome to instagram")
        print("Instagram")
        option = input("Login or Register (login,register): ")
        if (option != "login" and option != "reg"):
            begin()
    begin()

check if you're doing fine by running the program after every step.

![image.png](https://cdn.steemitimages.com/DQmd3U9DMszQpN8EGZr5Go3M5FuQa3JcniCGMKYFGWFiXWE/image.png)

# Step 3:
Now, in this step, I've created another function which will be collecting option. I've added an if, else condition for login and register. Asking the user his name and password.

    def access(option):
        global name
        if (option=="login"):
            name = input("Enter your name: ")
            password = input("Enter your password: ")
            login(name, password)
        else:
            print("Enter your name and password to register")
            name = input("Enter your name: ")
            password = input("Enter your password: ")
            register(name, password)
    access(option)

![image.png](https://cdn.steemitimages.com/DQmd3U9DMszQpN8EGZr5Go3M5FuQa3JcniCGMKYFGWFiXWE/image.png)

# Step 4:
After that, in the register function I'll be opening that text file where I've saved the user's info.

    def register(name, password):
        file = open("user_login_details.txt","a")
        file.write("\n" + name + "," + password)
        file.close()

Now do exactly same as for login function. I've created a for loop and to check my program, I'll be printing it.
    def login(name, password):
        file = open("user_login_details.txt","r")
        for i in file:
           a,b = i.split(",")
           b = b.strip()
           print(a,b)
           if (a==name and b == password):
               success = True
               break
        file.close()

![image.png](https://cdn.steemitimages.com/DQmd3U9DMszQpN8EGZr5Go3M5FuQa3JcniCGMKYFGWFiXWE/image.png)

# Step 5:
Adding an if else condition to check whether the info provided is correct or not.

    if (success):
            print("login successful!")
            grant()
        else:
            print("wrong username or password")

If not, then it'll give an error to the user, like this...
![9.jpeg](https://cdn.steemitimages.com/DQmSSHmL8yNg8JF4BfWmZh79KMhKMDvugu7kEcvFErWq8mG/9.jpeg)

![image.png](https://cdn.steemitimages.com/DQmd3U9DMszQpN8EGZr5Go3M5FuQa3JcniCGMKYFGWFiXWE/image.png)

# Step 6:
Proceeding towards the final steps, I've created another function named as grant. And  I've set the new variable permitted as False. 

    permitted = False
    def permit():
        global permitted
        permitted = True

![image.png](https://cdn.steemitimages.com/DQmd3U9DMszQpN8EGZr5Go3M5FuQa3JcniCGMKYFGWFiXWE/image.png)

# Step 7:
Now, in this last step, add an if condition, where we'll save and show all the user's info like this...
    
    if (permitted):
        print("Welcome to Instagram")
        print("**User details**")
        print("username: ",name)

This will be the output,
![image.png](https://cdn.steemitimages.com/DQmd3U9DMszQpN8EGZr5Go3M5FuQa3JcniCGMKYFGWFiXWE/image.png)

That was all for this tutorial, Hope you like this tutorial*

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