Skip to main content

---Variables and data type in Python ---

 Variables: 

Variables can be considered as the name of a container. In other words, a variable is a container whose value can change depending on certain conditions. 

When we allocate a value to a variable, it is known as a variable assignment.

 In python, the syntax for it is variable_name = value



 Let's understand Variables with the help of a birthday card.


















My birthday
1 st July 5:00 PM 
12/2, Rajouri Gardens 
9898463123

Now depending on whose birthday it is and who is being invited, the details being filled in the ‘_______’ (blank space) keep on changing…right? 
Imagine this ‘________’ as a container and the details being filled are the values. This value can change depending on circumstances.



Variables can be considered as the name of a container. So in the above example, 
date=”1 st July”
 address=”12/2, Rajouri Gardens”
 If the card is filled by someone else it can be, 
date=”21 st July”
 address=”34, MG road”
 Here, date, address, etc are containers (variables), and “1 st July”, ”12/2, ``Rajouri Gardens”, “21 st July” etc are values. 

Rules for forming Python variables: 

● A variable name must start with a letter or the underscore character.
● A variable name cannot start with a number. 
● A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )(space is not allowed)
● Variable names are case-sensitive (age, Age, and AGE are three different variables)


Datatype: 

Datatype is the type of value assigned to a variable. Depending on values that are assigned to a variable, a few common data types (variable type) in python are



suppose you want to take a printout of a birthday card. What details do you have to enter into the
computer, each time you take a printout? all the variables(like name, address, etc) have to be entered. And once you enter the variables, you will get the birthday card printed …right? So the variable data you enter is known as the input and the birthday card you get is the output. 



Output in python print () ->prints message given between () with newline(default) 

                                                                                                                                                                    Note : 

● “” is used with strings/ messages 
● If we give “” for the variable it will be considered as a string. 
● By default terminating the character of the print, the statement is a newline. 

Input in python

 ● input() 
 ● When the input() function executes program flow will be stopped until the user has given input. 
 ● By default, all input in python is taken as a string.

Syntax Input(). 
● returns the value entered by the user for the <message>  printed on-screen. 

●<message>  is optional.


program to get the name of the birthday boy from the user.





Now modify the above program to print his name on screen






In both the above versions, the name is the variable that holds the child’s name as a value.

Program to Get all the relevant details from users and prepare a birthday invitation card.




























Program to Get all the relevant details as input and make a birthday invitation card Get the invitee address details from the user and print out an address slip to be pasted on the invitation card.



















Output:






Labels:

Comments

Post a Comment

Popular posts from this blog

- Animating characters using pygame -

If you see closely you can see that the mickey mouse animation is made out of a lot of shapes.  But to create something like this we need to make a very complex code. The other way around it is to use an image, other than the basic shapes, pygame also can show images.  Using images :  Steps to use images in my game: > find the image you want to use  > move it to the directory where you have created your code  > import/load image  To load the image we will first create an object and then use the image. load method to add the image to the object.  here, we have created an object called an image.  We then use the "pygame.image.load" to find the file in the directory ocean.png has to be replaced with the filename of your file.  To place the object on a particular point of the screen we use the blit function.  this function means that we are going to add the image onto the screen at position 0,0 mickey mouse is winking  Using text: We can also add text to the pygame, to a
Post a Comment
Read more

- Functions in Python -

  Function-  ● A function is a named block of code designed to perform a specific task.  ● It takes in some input (optional), processes it, and gives us some output. (optional)  ● A function once defined, can be called many times. eg: function to draw a square, function to calculate average, etc. A function has 2 parts - function definition and function call.  Have you ever used a soft drink vending machine?  You give it some input (the drink you want, money ) and it does some processing inside(checks the amount, checks availability) and gives you the output(the soft drink).  Here, you are not bothered about, how the machine works or from where it gets the soft drink. right? You just give the input and you get the required output. isn’t it?  Functions in programming also behave in a similar way. Function definition: Set of instructions that form the function.  Syntax  def  <function name>(<parameter>):        <statement 1>         <statement 2>        --------  
Post a Comment
Read more

- Quiz game in Python -

 Game Overview  ● Questions are stored in a file. We will have to read it from the file and store it in a dictionary.  ● 2 points for the correct answer and -1 point for the wrong answer  ● Max no. of questions asked:5  ● Questions will be shuffled once and then asked sequentially.  File Template (for the program)  Each question in the file is stored as <Question> : <Answer> Here ‘:’ acts as a separator between question and answer.  Each line read from the file will be of string data type. ‘:’ helps in separating the answer from the question.  Note: Make sure you add a ‘:’ between question and answer if adding a question manually.  Algorithm  Now that you have seen how the quiz game works, Let's have look at the algorithm for the same.  1. Read the entire file  2. From each line read, get the question and answer a. Add to dictionary  3. Print the rules of the game 4. Shuffle the questions  5. Get each question from the quiz dictionary           a. Ask the question     
Post a Comment
Read more