Learn Python Basics: Build Your First Real Programs

Learn how Python uses if statements as conditionals, create variables a and b with values 10 and 6, and print a result when a > b, illustrating the if block.

Compare A and B with an if A > B condition and print yes when true; use an else statement to print no when false.

Demonstrate Python looping with a while loop using a true condition, showing that it prints the okay string indefinitely and that indentation defines the loop body.

Demonstrates constructing a while loop in Python. Initializes a variable to 4, prints it while a > 1, and decrements by one until the condition fails.

Explore the range() function with a start of 1 and stop of 5, and how a for loop prints 1 to 4, since 5 is not included.

Demonstrates the range function with start, stop, and step in a for loop, producing 1 and 3, then updates b from 6 to 18 and prints 18.

Explore how the break statement halts a Python for loop using range until i equals two. Observe 0 and 1 printing before the loop stops at 2.

Build a while loop with an else branch in Python, using variables a and b, decrementing a until a is not greater than b, printing each step.

Explore the list data type in Python, enabling you to store multiple values—integers and strings—within a single variable, expanding beyond single-value variables introduced earlier.

Create a list data type in Python by using the assignment operator to store strings and integers in brackets; print the list and verify its type is list.

Learn how to use negative indexing in Python to access list elements from the end, such as city, five, and name by negative indices.

learn how to create a list in Python, assign elements, and use len to count them, then iterate with a for loop to print each element.

Explore Python tuples, a sequence data type that stores multiple values and can be iterated with for loops. Learn two creation styles, with or without parentheses, though parentheses aid clarity.

Understand that tuples are immutable in Python and cannot be modified after creation, so indexing, assignment, delete, or append operations raise errors.

Access elements via indexing and concatenate tuples to form new ones, printing results with an alphabet example; learn that concatenating a tuple with a string or integer raises an error.

Explore Python dictionaries, a non-sequence datatype created with curly braces and colon separated key-value pairs, where keys are unique and values can be data types, but lists cannot be keys.

Dictionaries are mutable; the example updates the city value from New York to Washington, adds a planet key with earth, and prints the updated dictionary.

Learn how to define and invoke a Python function, using a valid name, parentheses, and indentation, and understand function reuse and the importance of not shadowing the function name.

Define a function with a parameter named direction, pass an argument such as left to print a directional message, and learn that omitting an argument causes an error.