Python · Beginner
Conditional Logic
If-statements allow your code to make decisions. The elif (else if) and else clauses provide alternative paths based on different conditions.
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Beginner Python exercises
Read these Beginner Python snippets line by line — each one comes with a written breakdown of what the code does and why.
Python · Beginner
Basic Exception Handling
Exception handling prevents your program from crashing when errors occur. The try block contains code that might fail, while the except block handles the error.
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Defining Functions
Functions are reusable blocks of code. They can take inputs (parameters) and return a result using the return keyword.
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List Operations
Lists are ordered collections of items. You can add items using the .append() method and access them using their zero-based index.
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Variable Assignment and f-Strings
In Python, variables are created by assigning a value. f-strings (formatted string literals) allow you to embed variables directly inside strings using curly braces.
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Python Dictionaries
Dictionaries store data in key-value pairs, allowing you to look up information using a specific label instead of an index.
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The While Loop
A while loop repeatedly executes a block of code as long as a specified condition remains true.
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Importing Modules
The import statement allows you to use code from external libraries or modules, such as the built-in math module for calculations.
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String Slicing
Slicing allows you to extract a specific portion of a string by defining a start and end index.
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Unique Items with Sets
Sets are collections of unique elements; they automatically remove any duplicate values provided during initialization.
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List Comprehensions
List comprehensions offer a shorter syntax when you want to create a new list based on the values of an existing list.
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Formatted String Literals (f-strings)
F-strings provide a concise and convenient way to embed expressions inside string literals for formatting.
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Basic Exception Handling
The try-except block is used to catch and handle exceptions, preventing the program from crashing when an error occurs.
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Dictionary Key-Value Access
Dictionaries store data in key-value pairs. Using .get() is safer than square brackets because it returns a default value if the key is missing.
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Defining a Function
Functions allow you to wrap a block of code and reuse it throughout your program by calling its name.
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Python Tuples
Tuples are ordered, immutable collections of items. Once created, their contents cannot be changed, making them useful for fixed data structures.
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Working with Sets
Sets are unordered collections of unique elements. They automatically remove any duplicate values you try to add.
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Using Enumerate
The enumerate() function adds a counter to an iterable and returns it, allowing you to track the index while looping.
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The Zip Function
Zip allows you to iterate over multiple lists at the same time by pairing their elements together.
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The __name__ == '__main__' Guard
This idiom ensures that code inside the block only runs if the script is executed directly, and not when imported as a module.
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While Loops
A while loop repeats a block of code as long as a specified condition evaluates to True.
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List Slicing
Slicing allows you to extract a specific portion of a list using start and end indices.
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Default Arguments
You can assign default values to parameters in a function definition, making them optional when calling the function.
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Basic Class Definition
Classes are templates for objects. The __init__ method is a constructor that initializes object properties.
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Type Conversion
Type conversion (casting) is used to change a value from one data type to another, such as converting a string to an integer.
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Getting User Input
The input() function allows a program to pause and wait for the user to type something. It always returns the input as a string.
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Generating Number Sequences with range()
The range() function generates a sequence of numbers, which is commonly used for looping a specific number of times. By default, it starts at 0.
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Documenting Code with Docstrings
Docstrings are literal strings used right after a function definition to explain what the function does. They use triple quotes.
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The Global Keyword
The 'global' keyword allows you to modify a variable that is defined outside the current function's scope.
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Logical Operators: and & or
Logical operators allow you to check multiple conditions at once. 'and' requires both to be true, while 'or' requires at least one to be true.
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