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

What Is a List?

A list is a data type that can hold multiple items, which can be of various types such as numbers, strings, tuples, and more.

To create a list, simply place a series of comma-separated values or variables inside square brackets []. Alternatively, you can convert other iterable objects (like strings, sets, or tuples) into lists using the list() function.

For instance, let's craft a list that contains details about the USA (name of the country, its land area, and population):

Accessing elements within a list is similar to how you'd access characters in a string: through indexing and slicing. For instance, if we wanted to retrieve both the land area and population data, we'd target the second (index 1) and third (index 2) items in the list US_Info. When slicing, you specify the start and end positions using a colon :.

Note
Remember that the upper limit of the slice is not included. Hence, to retrieve these two elements, the slicing syntax [1:3] should be used.

Check out the example provided:

Everything was clear?

Section 4. Chapter 1