userName = input("Hello! Welcome! \n\nUsername: ") #Ask's the User for Username input
password = input("Password: ") # Ask's the user for their password


count = 0 # Create a variable, to ensure the user has limited attempts at entering their correct username and password
count += 1 # The user has already had one attempt above, therefore count has been incremented by 1 already.


while userName == userName and password == password: # The Input will always lead to this while loop, so we can see if their username and password is wrong or correct.


    if count == 3: # Counter, to make sure the user only gets a limited number (3)of attempts
        print("\nThree Username and Password Attempts used. Goodbye") # Lets the user know they have reached their limit
        break # Leave the Loop and the whole program


    elif userName == 'Surya' and password == 'surya': # The userName and password is equal to 'elmo' and 'blue', which is correct, they can enter FaceSnap!
        print("Welcome! ") # Welcomes the User, the username and password is correct
        break # Leave the loop and the whole program as the username and passowrd is correct


    elif userName != 'Jakey' and password != 'jakey': # The userName and password is NOT equal to 'elmo' and 'blue', the user cannot enter FaceSnap
        print("Your Username and Password is wrong!") # Lets the user know that the Username and password entered is wrong.
        userName = input("\n\nUsername: ") # Requests the user to have another attempt at entering their correct username
        password = input("Password: ") # Requests the user to have another attempt at entering their correct password
        count += 1 # Increments the count by 1
        continue # Continue, as the user hasn't managed to get their username and password correct yet


    elif userName == 'Jakey' and password != 'jakey': # The userName is equal to 'elmo', but password is NOT equal to 'blue', the user cannot enter FaceSnap
        print("Your Password is wrong!") # Lets the user know that their password is wrong
        userName = input("\n\nUsername: ") # Requests the user to have another attempt at entering their correct username
        password = input("Password: ") # Requests the user to have another attempt at entering their correct password
        count += 1 # increments the count by 1
        continue # Continue, as the user hasn't managed to get their username and password correct yet


    elif userName != 'Surya' and password == 'surya': # The userName is NOT equal to 'elmo', however password is equal to 'blue', the user cannot enter FaceSnap
        print("Your Username is wrong!") # Lets the user know that their username is wrong
        userName = input("\n\nUsername: ") # Requests the user to have another attempt at entering their correct username
        password = input("Password: ") # Requests the user to have another attempt at entering their correct password
        count += 1 # Increments the count by 1
        continue # Continue, as the user hasn't managed to get their username and password correct yet

Python Online Compiler

Write, Run & Share Python code online using OneCompiler's Python online compiler for free. It's one of the robust, feature-rich online compilers for python language. Getting started with the OneCompiler's Python editor is easy and fast. The editor shows sample boilerplate code when you choose language as Python or Python2. OneCompiler also has reference programs, where you can look for the sample code and start coding.

Taking inputs (stdin)

OneCompiler's python online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample python program which takes name as input and print your name with hello.

import sys
name = sys.stdin.readline()
print("Hello "+ name)

About Python

Python is a very popular general-purpose programming language which was created by Guido van Rossum, and released in 1991. It is very popular for web development and you can build almost anything like mobile apps, web apps, tools, data analytics, machine learning etc. It is designed to be simple and easy like english language. It's is highly productive and efficient making it a very popular language.

Tutorial & Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition IF-ELSE is used.

if conditional-expression
    #code
elif conditional-expression
    #code
else:
    #code

Note:

Indentation is very important in Python, make sure the indentation is followed correctly

2. For:

For loop is used to iterate over arrays(list, tuple, set, dictionary) or strings.

Example:

mylist=("Iphone","Pixel","Samsung")
for i in mylist:
    print(i)

3. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while condition  
    #code

Collections

There are four types of collections in Python.

1. List:

List is a collection which is ordered and can be changed. Lists are specified in square brackets.

Example:

mylist=["iPhone","Pixel","Samsung"]
print(mylist)

2. Tuple:

Tuple is a collection which is ordered and can not be changed. Tuples are specified in round brackets.

Example:

myTuple=("iPhone","Pixel","Samsung")
print(myTuple)

Below throws an error if you assign another value to tuple again.

myTuple=("iPhone","Pixel","Samsung")
print(myTuple)
myTuple[1]="onePlus"
print(myTuple)

3. Set:

Set is a collection which is unordered and unindexed. Sets are specified in curly brackets.

Example:

myset{"iPhone","Pixel","Samsung"}
print{myset}

4. Dictionary:

Dictionary is a collection of key value pairs which is unordered, can be changed, and indexed. They are written in curly brackets with key - value pairs.

Example:

mydict = {
    "brand" :"iPhone",
    "model": "iPhone 11"
}
print(mydict)