Using a Python function call

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Python function call

In the last post on Introducing Python, I showed how to build a simple app using variables and conditional statements. To do something really powerful in any particular programming language, you need to understand its functions! In this post we are going to 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: Best Python Courses Online

Functions are used throughout programming to group specific tasks. This is useful in a variety of circumstances, 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, you have two options:

  • Without functions: by repeatedly writing the code to draw a triangle with.
  • With a Python function call: by generating many 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’ll 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, just copy and paste your wholesale triangle code!

Example of a Python call function

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

def hello_print():
    print("Hello World!")
    return
hello_print()

How to Define and Call a Function in Python!

The function here is called HelloPrint. First we “define” this function with the def statement, then we place any code that should be 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 executing the function.

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

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

For example:

def hello_print():
    print("Hello World!")
    return
hello_print()
hello_print()

Run this code and you will now see the “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:

def hello_print(): print("Hello World!") return
hello_print()
hello_print()

This also means that you should figure out how to call a function from within another function:

def greetings_print(): print("Hello World!") nice_day_today() return
def nice_day_today(): print(“Nice day today, isn’t it!”) return
greetings_print()

In short, this is how you call a function in Python! But we still haven’t tapped into that real Power of Python still works!

How to 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”:

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 we can do this with a Python function call:

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. This enables a very fast and flexible coding!

There are innumerable ways we can use this feature. Here’s another little example that only takes three lines of 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 are in your name!

That includes rooms, 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 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.

That said, if you are a true beginner and are looking for a great course to get started with easily, we highly recommend you Coding with Python: training for budding developersThis is an absolute bargain as the course is valued at around $ 700.


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