#Python loops

[tccicomputercoaching]

Python Basics: Variables, Loops & Functions Explained Simply

🔹 Introduction to Python Programming

Python is like the cool friend who can suddenly make everything easier. Whether one is creating a calculator, automating mundane gestures, or simply dreaming of developing their own game, Python is often the first language anyone can turn to. But why?

👉 Join our full Python course to start learning step by step.

Being Python-Friendly for a Beginner

Because it has a clean readable syntax without a lot of techno babble. Python feels like English. You do not have to memorize some wild symbols or worry about setup-heavy jargon. It is just simple and direct, yet powerful.

What Can You Build with Python?

Python builds web apps, machine learning models, multimedia dashboards, even robots. Instagram, Dropbox, and Netflix all `speak` Python. Now, that is a cool thing!

🔹 Getting Started with Python

How to Install Python

To install Python and start coding, go to python.org. Click on download and install it just as you would install any application. Make sure you check the box that says "Add Python to PATH!" 

Writing Your First Python Program

Open the terminal or IDLE, and type now:

python

print("Hello, world!")

Hit Enter. Boom! You just wrote your first Python program!

🔹 Understanding Variables in Python.

What Are Variables?

Think of variables as containers; they contain data that you may want to access later. Think of it like a jar with a label- the variable stands for something we can retrieve and reuse.

python

name = "Alice"

age = 25

Here, name holds "Alice," and age holds 25.

Python Variable Naming Rules

Start with a letter or underscore (_)

Cannot begin with a number

Use snake_case for readability

Be descriptive: user_age is better than x

Different Data Types in Python

Python variables can store:

Integers: 5  

Floats: 3.14

Strings: "hello"

Booleans: True, False

Lists: [1, 2, 3]

Dictionaries: {"name": "Alice", "age": 25}

🔹 Introduction to Loops in Python

What Are Loops?

They let you execute the same set of commands repeatedly without having to copy the code a hundred times.

For Loop in Python

Perfect when you know exactly how many times to repeat something.

python

for i in range(5):

print("Loop number",i)

While Loop in Python

Perfect for when you don’t really know quite how many times you’re going to do something — you simply go on until a state-of- affairs has been met.

python

x = 0

while x < 5:

print(x)

x += 1

Loop Control Statements

break: terminates loop execution prematurely

continue: skips all statements in the current iteration and jumps to the next iteration of the loop

pass: does nothing; it is used as a placeholder

Also Read: Why Is Python A Good Programming Language For Beginners

🔹 Python Functions Made Easy

What Is a Function?

A function is a reusable block of code. It's like a recipe, one written once and used whenever a situation arises.

def greet():

  print("Hello!")

Built-in Vs User-Defined Functions

Built-in: Already present, like print(), len(), and type()

User Defined: Created by you via def.

How to Define a Function

python

def say_hello(name):

  print("Hello", name)

Call it using say_hello("Alice") 

Function Parameters and Return Values

You can pass information into a function and possibly get a result back:

python

def add(a, b):

  return a + b

🔹 Practical Examples of Variables, Loops & Functions

Simple Calculator Using Functions

python

def add(a, b):

  return a + b

print(add(10, 5))

Looping through a List of Names

python

names= ["Alice", "Bob", "Charlie"]

for name in names:

  print("Hello", name)

Using Variables to Keep Score

python

score = 0

score += 10

print("Your score is", score)

🔹 Common Mistakes Beginners Make

Variable Name Confusion

name and Name can be entirely different variables; Python is case-sensitive.

Infinite Loops

If you forget to update a variable used in a while loop, the program might never terminate.

Forget Return Statements

If a function is not specified with return, no value is returned; it simply performs an action.

🔹 Tips to Improve Your Python Skills

Practice Small Projects

Start with building a calculator, to-do app, or number guessing game.

Read Others' Code

Check out GitHub, follow tutorials, and watch how others approach a problem.

Use Online Platforms for Coding Practice

Try HackerRank, LeetCode, or Codecademy to get your practice and challenges.

Conclusion

Python is a beginner's best friend, especially once you understand the concepts of variables, loops, and functions. These concepts form the basis of almost every program. You will use these tools at every stage, from printing 'Hello World' to building a weather app.

So go ahead, code, break things, fix things, and most importantly, have fun with it. Python is always there for you!

🎓 Want to go beyond Python? Check out our full programming course library and take the next step in your coding journey.

At TCCI, we don't just teach computers — we build careers. Join us and take the first step toward a brighter future.

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Call now on +91 9825618292

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Note: This Post was originally published on https://tccicomputercoaching.wordpress.com/2025/05/07/python-basics-variables-loops-functions-explained-simply/  and is shared here for educational purposes.

[trendingnow3-blog]

Day-5: Mastering Python Loops

Python Boot Camp-2023: Day-5

Python Loop: A Powerful Tool for Iterative Tasks Python, one of the most popular programming languages, offers a wide range of features and functionalities. Among these, loops stand out as a powerful tool for performing repetitive tasks. In this article, we’ll explore Python loops, their types, usage, and best practices to optimize your code. 1. Introduction to Python Loops Loops are essential…

[szimmetria-airtemmizs]

Balance

[nostalgebraist]

Due to recent experiences, I am feeling an urge to make an anti-drug-style PSA except it's warning impressionable machine-learning-curious teens to never, ever try a thing called "Huggingface transformers Trainer"

Not. Even. Once.

[ensalada-de-lengua-de-pajaritos]

Unmute the loop!

[powerwithinart]

potent.

[angletelier]

I love replying to Tumblr comments :3

*is hiding in the bathroom avoiding doing my python coding homework*

[rickybutlersays]

please god please PLEASE say that someone else ships Lemming and Stapleton from monty python

[helloworldletscode]

Iterations - for loop

Iteration, aka repeating, is a solution for tasks that need to be done over and over again.

Instead of writing dozens of lines of code for the same purpose, we can simplify it and shorten it to just a couple of lines. This way the code is both easier to read for the other programmers (fellow people hehe) and faster to process for the computer.

Also, simpler code reduces errors rate.

Examples of iterations are loops.

Looping means repeating something until a particular condition is satisfied. 

Python has 3 Basic Loops:

For Loop - used when we know number of iterations (repetitions) in advance.

While Loop - for situations where the number of iterations is unknown beforehand. 

Nested Loop - using one looping statement inside another looping statement.

For loop is used to execute the same instruction over and over again, a specific number of times.

for i in range(5):     print(“Hello!”) Output: Hello! Hello! Hello! Hello! Hello!

In the first line, we declared how many repetitions are needed. In the second line, we wrote what should be repeated a given number of times. In this case, we asked Python to print the string “Hello!” 5 times.

Basic structure of the for loop:

for i in range(5):     print(“Hello!”)

for - a keyword that signals that “for loop” is starting.

i - internal variable name which is keeping the counter value. Stands for “iteration”. We can read the whole line as “for 5 iterations/repetitions, please do the following:” For every loop, the 'i' variable increases by 1 because it's the counter. 'i' doesn't have to be 'i', we can switch it to another letter or another word, that are python approved for this (for example, you can’t use name of defined function instead of 'i').

#Loop using "unicorn" as internal variable, instead of "i" for unicorn in range(10): print(unicorn) #still works!

  in range() - represents the list of numbers we are looping through (number of time the iteration is running). Python starts the counter from 0. It means that range(5) -  will give a sequence of 5 numbers: 0, 1, 2, 3, 4 range() function has 3 parameters(start, end, steps), default values for start is 0 and step is 1. When we write range(5), we only give one parameter, and the function still works, because Python reads it as range(0,5,1) and the sequence starts with 0, increases by 5 counts, with step between each number being 1, by default.

We can change the parameters: range(1,20,3) this would result in iterations that starts from 1, goes up by 3 steps with the upper limit of 20: 1, 4,7,10,13,16,19.

Example: #print every 2 numbers (evens): for i in range (2, 10, 2):     print(x) output: 2 4 6 8 (!) output does not include 10 because 10 is the upper limit (result only includes number under 10)

: adding a colon sign in the end of the first line is mandatory, otherwise an error will occur.   Finally in the next line, we start writing the instruction, that is supposed to be repeated. This part isn’t starting right away, it should be indented. Indentation is the blank gap at the beginning of lines. Normal indentation is 4 spaces/tab long. Python would recognize 2 spaces or 4 spaces as an indentation, but 4 spaces length is more agreed upon and is used more wildly.

tip: How to write an instruction to get output of a list that starts from 1 instead of 0, accompanied by a string:

for i in range(10):     print(i+1, "I love you")

[fortune-slip]

I'm taking a class on like. advanced data structures and blah blah whatever blah. riveting stuff. Anyway one the main things we're being taught in the class is runtime optimization which makes sense. but like. why is it being taught in python of all languages

[american-baidu-yandex-contact]

Python Interpreter Loop Counter

[szimmetria-airtemmizs]

On the sides you can see two curves of constant width, that is a curve whose width is the same in all directions. This is the reason they always touch the two lines as they rotate. The existence of curves of constant width is well known by now. What is much less known is that you can morph between any two such curves such that during the morph the curve stays a curve of constant width. For these two curves the morphing can be seen in the middle. (Actually, you can see two different morphs. )

[doedipus]

the difference between my enthusiasm after one day of the japanese class and my enthusiasm after one day of the programming class are night and fucking day, to the extent I'm considering just dropping the programming one on the spot

[auncyen]

reading a programming book that is using a program that simulates rock paper scissors as the tutorial for loops and it's just. ah. this is me associating ISAT with unrelated things now

[allenmmmm]

Python Loops Tutorial | Loops In Python | Python Loops Tutorial for Beginners

Let's go through a basic tutorial on loops in Python. This tutorial is designed for beginners, and we'll cover the two main types of loops in Python: for and while loops.

1. For Loop:

The for loop is used to iterate over a sequence (such as a list, tuple, string, or range).# Example 1: Iterate over a list fruits = ["apple", "banana", "cherry"] for fruit in fruits: print(fruit) # Output: # apple # banana # cherry # Example 2: Iterate over a range of numbers for i in range(5): print(i) # Output: # 0 # 1 # 2 # 3 # 4

2. While Loop:

The while loop is used to repeatedly execute a block of code as long as the specified condition is true.# Example 3: Simple while loop count = 0 while count < 5: print(count) count += 1 # Output: # 0 # 1 # 2 # 3 # 4

3. Loop Control Statements:

break: Terminates the loop.

continue: Skips the rest of the code inside the loop for the current iteration.

else clause with loops: Executed when the loop condition becomes False.

# Example 4: Using break and continue for i in range(10): if i == 3: continue # Skip the rest of the code for this iteration elif i == 8: break # Exit the loop when i is 8 print(i) else: print("Loop completed") # Output: # 0 # 1 # 2 # 4 # 5 # 6 # 7

4. Nested Loops:

You can use loops inside other loops.# Example 5: Nested loops for i in range(3): for j in range(2): print(f"({i}, {j})") # Output: # (0, 0) # (0, 1) # (1, 0) # (1, 1) # (2, 0) # (2, 1)

This is a basic introduction to loops in Python. Practice with different examples to solidify your understanding. In Part 2, you can explore more advanced concepts and practical applications of loops in Python.

Watch Now: -The Knowledge Academy

[relto]

optimization journey: glue 10000+ arrays together for each data channel -> reduce number of array glueing required by doing 32 sequences at once -> NO array glueing at all!