Course Content

Introduction to Python

1. First Acquaintance

The Very First Steps Comments Some Simple Math More Challenging Math Challenge Bringing It All Together

2. Variables and Types

Storing Numbers Naming Rules Using Variables Data Types Numbers Challenge Storing Text String Indexing Negative Indexing and Length String Slicing Challenge Concatenation

3. Conditional Statements

Boolean Data Type Challenge: Comparison Operators Combining Conditions Challenge: Logical Operators Membership Operators and Types Comparison Simple if/else Expressions Challenge: Grocery Store Challenge: Odd and Even if/elif/else Expressions Challenge: Grocery Store 2 Challenge: Positive, Negative or Zero

4. Other Data Types

What Is a List?List Methods Challenge Nested Lists Challenge What Is a Tuple?Tuple Methods Challenge Nested Tuples Challenge What Is a Dictionary?Challenge Dictionary Methods Challenge

5. Loops

while Loop Challenge for Loop Challenge Range Challenge Iterating Over Indexes Nested Loops

6. Functions

Built-in Functions Challenge Defining Your First Function Challenge if/else Statements in Functions Challenge Functions With No Return Challenge Modifying Functions Challenge Lambda Functions Challenge

Introduction to Python

while Loop

Often, in programming, you want your code to run repeatedly as long as a specific condition is true. Think about how, in everyday life, we stay on a subway train until we reach our designated stop. If our destination is "Station B," we'll pass by "Station A," "Station C," and so forth until we arrive at "Station B." In Python, you can simulate this behavior with a while loop, structured like this:

For instance, we can use this loop to print all numbers up to 10.

Note
By default, the print() function outputs each result on a new line. By employing the end=' ' argument, we ensure that multiple print() outputs are separated by a space. We'll be using this technique throughout this section.

The loop's logic is outlined above. You might observe that we've included i = i + 1 within the loop. Without this line, our loop would run indefinitely because each time the condition is checked, it would find 1 < 10, which is always True. So, when working with while loops, it's crucial to ensure your code doesn't enter an endless loop.

Everything was clear?

Section 5. Chapter 1