Skip to main content

- 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>

       --------

        ----- 

       return<variable name> 

Note: <parameter> and <return statement> are optional.

parameter: data that are passed as input to function (input)

return: It is used to return some value to the calling function (output) 

Function Call:

 It calls a function.

 Syntax : <function_name >(<arguments>)

Note: <arguments >are values that are passed as input to the called function.










A function has to be defined before it is called. 

Note: Explain these concepts using the teacher activities given below. 

New methods used in code:

Define a function to draw a square and call it.
 










Note: This function draws a square of length 150 units. 

Modify the function to draw a square of the user-specified length.












Note: The parameter is helping in customizing the code as per user need. Earlier squares of only predefined length could be drawn.

 Modify the function to return the area of the square and print it. 













Write a function to draw a triangle and call it.




















Modify the above program to draw a triangle of user-specified length. 










 Modify the above program to return the sum of the length of all 3 sides. 











Draw a house of the user input length. 














Note: The square is drawn downwards (turn right) and the triangle is drawn upwards. (turn left) 


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  Usi...
Post a Comment
Read more

- Object Oriented Programming -

In OOP, we can represent an entity using a class.  A class bundles data (features/properties of entity - color, height, width) and functionality (movement, expression) together.  An instance of a class is known as an object.  Which is the only cartoon series that had predicted that Trump would be elected as the president of the USA and also predicted the coronavirus spread?   Answer: Simpsons.  Simpsons is a very popular animated show. You can build something similar with python.  But have you ever wondered, how Simpsons look the same in all the series? Only his movement looking and, expression change but his main features like color, height, and face look exactly the same all the time.  This is because we create a ‘blueprint’ of Simpsons and whenever we have to simulate him on screen we use this blueprint. This keeps a record of all the features of Simpsons and recreates it whenever we want.  This is where Object-Oriented Programming(OOP) h...
Post a Comment
Read more

-List Slicing in Python-

 List Slicing : Slicing helps in creating a new list from an existing list.  Syntax list_name [start :end:step] Suppose you have a list of Avengers, arranged in the order of your preference.   avengers=[“Iron Man”,”Thor”,”Hulk”,”Spider Man”,”Captain America”,”Black Panther”,”Hawk Eye”,”Vision”,”Black Widow”] Later you decide to split them into a separate list like  favourite=[“Iron Man”,”Thor”,”Hulk”]                                                   less_favourite =[”Spider Man”,”Captain America”,”Black Panther”]                             least_favourite=[”Hawk Eye”,”Vision”,”Black Widow”]  Now, we have 3 lists formed from the main list. Would you want to create these lists again from the beginning? This is where list slicing helps us. Here is the code to  G...
Post a Comment
Read more