Many people have been thinking about what Python programming looks like and in this article, I will expose you to the best introduction part. What is Python Programming?
Introduction
Python is a popular, high-level programming language known for its simplicity, readability, and versatility. It has a vast array of libraries and frameworks that make it ideal for a wide range of tasks such as web development, scientific computing, data analysis, and artificial intelligence.
Advantages of using Python
Advantages of using Python:
- Easy to learn: Python has a simple syntax, making it easy for anyone to pick up and start coding quickly.
- Large community: Python has a large and active community of developers who contribute to its libraries and tools, making it easier to find solutions to problems and get help.
- Versatile: Python is used in a variety of applications, including web development, scientific computing, data analysis, and machine learning.
- Open-source: Python is an open-source programming language, meaning that its source code is freely available and can be modified to fit specific needs.
- Plenty of libraries: Python has a vast collection of libraries that provide pre-written code for a wide range of tasks, from web scraping to machine learning.
Using Python for Data Analysis
Python is also a popular choice for machine learning due to its libraries such as TensorFlow, Keras, and scikit-learn. These libraries provide tools for building and training machine learning models, making it easy to get started with tasks such as image classification, natural language processing, and predictive modeling
Let’s Do Some Examples.
Use Termux App to Run This
I downloaded Termux from f-droid
https://f-droid.org/repo/com.termux_118.apk
$ apt update
$ apt upgrade- Now you need to install a python3 and nano package with the given command. Nano is a text editor we will use to write our python programs.
$ apt install python3 nano- To create a python file run command given below.
$ nano file.py- A new window will be open where you need to write your python code. After writing the complete python code save the file with CTRL+X
- Now on the termux terminal and you need to run a given command to run the saved python file.
$ python3 file.pyNow you can easily write and create python code in Termux. If you have any further issues then don’t forget to comment and Share them in your community to support us.
Can I code Python in Termux?
Yes, with the help of nano editor and python3 package we can easily write python code in Termux.
As a programmer, the core of your job is to write a software program that does something useful.
This could be displaying a message when a button is clicked or taking an input, processing it and pushing out a desired output. It could be anything. The important thing is that a software program does something.
That something may not be important to you. But it is important to someone else in another corner of the world.
Generally, a software program consists of statements and expressions, all of which guide a computer to do something it is able to do because of its nature.
The statements and expressions are written using a programming language.
Python is one of such programming languages.
There are statements and expressions unique to a programming language. There are also statements and expressions common to all programming languages.
Before we look at statements and expressions unique to Python, let’s look at statements and expressions common to all programming languages.
The first is a function call statement.
What is a function call statement?
A function call statement is a statement that calls a function. That is, it is a statement that tells a function to do something it was created to do.
Assume a function has been created to print a text, any text, when a statement calling the function is written and executed, a text will be printed.
Function call statements are common in all programming languages.
print function is a built-in function in Python. It was created so it can be used to print a text. Assume there is a need for a text to be printed in the terminal, rather than you trying to figure out how to print a text in the terminal, all you need to do is make use of the print built-in function.
To make use of a function, all you need to do is write a statement that calls it.
The below is a statement that calls the print function:
print(“Jerome_Udoh”)
What you should know about the print function is that it was created such that when you call it, you must include in the statement the text you want the function to print. In the above example, JEROME_Udoh was included in the call statement.
You’ve seen a function call statement. A function call statement is one category of statement you would find in a software program.
Before we look at another category of statement, let’s create a Python program that consists of just that one statement.
Step 1: Create a file that goes by the name Jerome_Udoh.py
Step 2: Insert the following texts into it
print(“Jerome_Udoh”)
Step 3: Save the file and run it by typing
python3 Jerome_Udoh.py
The text Jerome_Udoh should appear in the console.
Now let’s look at another category of statement common to all programming languages.
A variable declaration statement.
A variable declaration statement is a statement that declares a variable, that is, creates it.
Typically, a variable is created for the purpose of storing a specific data.
More often than not, you will run into the need to collect data. A variable will be used to store that data.
The below statement is a variable declaration statement
name = “Jerome_Udoh”
It creates a variable name and stores the text Jerome_Udoh in it.
Modify the program in the Jerome_Udoh.py file into the below and run it:
name = “Jerome_Udoh”
print(name)
The text Jerome_Udoh will still be printed in the console.
This text was not written directly in the statement calling the print function. It was instead first stored in a variable. A reference was then made to it in the statement calling the print function.
I’m currently at work and need to attend to work. When I get home, I’ll explore more statements.
Next, we will look at a function declaration statement.
A function declaration statement is a statement that creates a function.
The creators of every programming language do provide functions known as built-in functions.
These functions are called built-in functions because they are part of the language.
A programming language is implemented as a software program. Built-in functions are part of the software program.
Built-in functions are free to use. All you need to do is write codes calling them.
There are 68 built-in functions made part of the Python programming language.
But apart from built-in functions, there are user-defined functions and there are third party functions.
Third party functions are just like built-in functions, In that you don’t create them. They’ve been created by somebody. All you need to do is use them.
But differences still exist between built-in functions and third party functions. One difference is that third party functions are owned and controlled by third parties. They are external to the language. And they can cease to exist at any time without notice to anyone using the function.
On the other hand, the creators of the Python programming language can’t just wake up and remove a built-in function.
Another difference between a built-in function and a third party function is that some third party functions are not free. On the other hand, all built-in functions are free to use.
What are user-defined functions?
User-defined functions are functions you as a creator of a software program will be creating in order for your software program to come to life.
Except you are creating a trivial software program, you will be creating user-defined functions.
Now, to use built-in functions and third party functions, you need to call them. Same is also applicable for user-defined functions. You still need to call those functions you create in your program.
How do you create a function?
You create a function by writing a function declaration statement and then writing other statements and expressions inside it.
The below is a sample function declaration statement:
def printJerome_Udoh():
name = “Jerome_Udoh”
print(name)
The statement creates a function that goes by the name printJerome_Udoh. The function was created to print the name Jerome_Udoh. When the function is called and the statement calling the function is executed, the name Jerome_Udoh will be printed in the terminal.
Replace the statements in the Jerome_Udoh.py file with the below:
# Create function printJerome_Udoh
def printJerome_Udoh():
name = “Jerome_Udoh”
print(name)
Then save and execute the file.
Nothing will be displayed in the terminal.
This is because the printJerome_Udoh function has not been called.
Now, replace the codes with the below:
# Create function printJerome_Udoh
def printJerome_Udoh():
name = “JEROME_Udoh”
print(name)
# Call function printJerome_Udoh
printJerome_Udoh()
The name Jerome_Udoh will be printed in the terminal.
Let’s tweak the program. We will create a function getJerome_Udoh. This function will be assumed to get the name Jerome_Udoh from a database. This means before your name can be printed, the getJerome_Udoh function needs to be called.
The below codes demonstrates it:
# Create function getJerome_Udoh
def getJerome_Udoh():
name = “Jerome_Udoh“
return name
# Create function printJerome_Udoh
def printJerome_Udoh():
print(getJerome_Udoh())
# Calls function printJerome_Udoh
printJerome_Udoh()
Replace the codes in the Jerome_Udoh.py file with the codes and run the file.
The name Jerome_Udoh should appear in the terminal.
Next, give a close look at the code calling the print built-in function. See that the getJerome_Udoh function is being called inside it.
Variables and functions are two constructs common to all programming languages.
Today, you’ve gotten a taste of how they are created in Python.
Conclusion
In conclusion, Python is a versatile and powerful programming language that is well-suited for a wide range of tasks, from data analysis to web development to machine learning. With its simple syntax, large community, and vast collection of libraries, Python is an excellent choice for anyone looking to learn to program or take their skills to the next level.
