Python Pioneers: A Beginner's Guide πŸ‡ͺπŸ‡Ή
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Welcome to Python Pioneers: Empowering Ethiopian students to embark on their coding journey.

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In the tech world, things change fast. Adapting to these changes quickly is what helps us stand out as better programmers. Project changes are tracked using version numbersβ€”and they aren't random. They convey crucial information about the current state of a project.

The Python project uses a major.minor.micro versioning scheme for production releases (the versions we care about most!). Here is how it breaks down:

πŸ”Ή Major version (x.0.0): These are rarely incremented. They only occur when there are significant backward-incompatible changes or a complete, ground-up redesign of the project. These updates are planned years in advance. Python has only had four major versions in its history: 0.x.x, 1.x.x, 2.x.x, and 3.x.x (our current version).

πŸ”Ή Minor version (0.x.0): These are incremented for new features and library deprecations. They can sometimes introduce breaking changes too. In Python's release cycle, a new minor version comes out every year in October.

πŸ”Ή Micro version (0.0.x): These updates are reserved for bug fixes and security patches on an existing minor release.

As of today, the current stable release of Python is Python 3.14.5. 🐍

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List comprehensions
List comprehensions are expressions that allow us to transform lists in a single line. The syntax:
[ <inner_expression> for <item> in <list> ]


It may look intimidating at first glance but what will happen is python loops through the list and executes the <inner_expression> for each <item> in <list> to create a new list.

# Example
nums = [1, 2, 3, 4, 5]
squared = [n ** 2 for n in nums]
print(squared)

# output: [1, 4, 9, 16, 25]


Above we have two expression the outer_expression which is the list comprehension itself and the inner_expression (n ** 2) which transforms the list. In this case the inner_expression squares each item from the list.

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Lambda functions
Another cool expressions or patterns in python are lambda functions a.k.a anonymous functions. We use them to define functions inline (in one line).
# Syntax
lambda arguments: expresion

The subtle thing we need to understand about anonymous funtions/lambda functions is that they don't have a name unless we explicitly assign them to a variable. The return value of lambda function is the evaluated expression.

The concept actually exists in many programming languages as anonymous functions or function expression, even-though the syntax could be different.
# Examples

# This is valid - With no name
lambda x: x

# With a name
times2 = lambda x: x * 2

# With two argumetns
prefix = lambda pre, post: pre + post;
postfix = lambda post, pre: prefix(pre, post)

print(times2(10))
print(prefix("main", ".py"))
print(postfix(".py", "main"))

# ----------Output----------
20
main.py
main.py


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