Development Coding Programming Android C Sharp
Development Coding Programming Android C Sharp


Learn C # for Android

In the last post on introducing Python, I showed how to create a simple app with variables and conditional statements. However, to do anything really powerful in any particular programming language, you need to understand functions! In this post we will discuss the Python function call.

What is a Python function call?

Before we look at how to call a function in Python, we first need to familiarize ourselves with the concept.

Also read: The best Python courses online

Functions are used throughout programming to group specific tasks. This is useful in a variety of situations, especially when a repetitive task has to be performed multiple times.

Functions are used throughout programming to group specific tasks.

For example, if you’ve created an app that drew hundreds of triangles on the screen to create a kaleidoscopic effect, there are two ways you can do it:

  • Without functions: by repeatedly writing the code with which a triangle is to be drawn.
  • With a Python function call: by generating a lot of coordinates and feeding them to your “Draw triangle” function.

The latter is far more efficient, requires less code, and is generally the preferred method. Not only that, but if you ever decide you want to draw Squares instead of triangles; You could just change a few lines of code and the entire output would be different!

Another benefit of using functions is that they are modular and portable. If you’re writing another program with a triangle in it, you can just copy and paste your triangle code in bulk!

Example of a Python call function

Here is an extremely simple example of a Python function that prints “Hello World!” on the screen:

code

def hello_print():

    print("Hello World!")

    return

hello_print()

How to Define and Call a Function in Python!

The function is called here Hello Print. First we “define” this function with the def statement, then we place the code that we want as part of it directly below it. The return statement simply tells the interpreter to return to the point in the code where it was before the function was executed.

Notice that I capitalized every word in my function name. This is a best practice because it helps distinguish a Python function call from statements.

Now we want to say “Hello world!” Anytime. we can just write HelloPrint () and it will happen!

For example:

code

def hello_print():

    print("Hello World!")

    return

hello_print()

hello_print()

Run this code and you will now see “Hello World!” Message appears twice!

Because this code is grouped separately, it won’t run until you use the Python function call. It also means that this code does the exact same thing:

code

def hello_print():

 print("Hello World!")

 return

hello_print()

hello_print()

This also means that you should be able to call a function from within another function:

code

def greetings_print():

 print("Hello World!")

 nice_day_today()

 return

def nice_day_today():

 print(“Nice day today, isn’t it!”)

 return

greetings_print()

And so, in a moment, you’ll be calling a function in Python! But we still haven’t got into that real Power of Python functions still!

Pass information to a Python function call

While functions are useful for performing repetitive tasks, their real strength lies in their ability to give and receive data. That’s what these little brackets are for: They allow us to call a function in Python and pass data at the same time.

For example, the following code says “Hello Adam”:

code

def say_hello(Name):

 print(“Hello ” + Name)

 return

say_hello(“Adam”)

This means that the same function can perform slightly different actions depending on the variables we give it.

How to manipulate data

Even more useful, however, is a function’s ability to transform data.

To do this, we need to pass information to the function, take an action, and then return that information.

Here is one way to do this with a Python function call:

code

def multiplier(Number):

 return = Number * 10

print(multiplier(5))

Here the output is “50” because the number 5 is passed with the Python function call, which returns this value multiplied by 10. Notice how we can write the Python function call as if it were the name of an integer itself. This enables a very fast and flexible coding!

There are innumerable ways to use this feature. Here’s another little example that only requires three lines of code:

code

def counter(Name):

 return len(Name)

name_please = input("Name length counter! Enter your full name ")

print(Counter(name_please))

This little app is a “name length counter”. This uses Python’s len statement, which returns an integer based on the length of a string. So this fun app can tell you how many characters your name has!

That includes spaces, but hey, nobody is perfect.

We’re just scratching the surface of Python

Now you know how to use a Python function call! This opens up a world of possibilities, but don’t stop there! To really take advantage of the full power of Python, you need to understand concepts such as functions, modules, and more. With that in mind, we recommend checking out our guide to the best Python courses online.

However, if you are a true beginner and are looking for a great course that is easy to get started with, we highly recommend you Programming with Python: Training for budding developerswhich you can get hold of for just $ 49.99, which is an absolute bargain as the price is valued at around $ 700.


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