Introduction to Python

1. First Acquaintance

In this section, you'll dive into the basics of Python, familiarize yourself with your workspace, tackle simple math operations, and display your results.

The Very First Steps

Comments

Some Simple Math

More Challenging Math

Challenge

Bringing It All Together

2. Variables and Types

Here, you'll learn how to store items like numbers and text in computer memory, recalling them by name. You'll also get a taste of text manipulation in Python.

Negative Indexing and Length

String Slicing

Challenge

Concatenation

3. Conditional Statements

Here, you'll delve into the boolean data type and discover its role in creating programs that respond to specific conditions.

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 Extended

Challenge: Positive, Negative or Zero

4. Other Data Types

Continuing with data types, this section will teach you how to group varied attributes within a single variable using lists, tuples, and the dictionaries.

What Is a Dictionary?

Challenge

Dictionary Methods

Challenge

5. Loops

In this part, you'll master the art of writing loops in Python – essential constructs for iterating over lists, tuples, dictionaries, and even future dataframes.

Iterating Over Indexes

Nested Loops

6. Functions

To wrap up our introductory course, you'll explore some built-in functions and then embark on creating your very own!

Built-in Functions

Challenge

Defining Your First Function

Challenge

if/else Statements in Functions

Challenge

Functions With No Return

Combining Conditions

In Boolean logic, two fundamental operators are OR and AND. What do they represent?

The OR operator checks if either of the conditions is true and returns True if so; otherwise, it returns False.

The AND operator ensures both conditions are true before returning True. If not, it returns False. In Python, to combine conditions, use the and & or operators (always in lowercase).

For example:

condition1 and condition2 yields True only when both conditions are True;
condition1 or condition2 gives True if at least one condition is True.

Note
You can also chain more than two conditions using these operators. Employ parentheses to clarify the order of operations.

As an illustration, consider these conditions:

Whether 2 exceeds 1 and if "bbb" isn't the same as "aaa";
If the character with index 2 in the string "my string" is either "y" or "s".

Code Description

In the first line of code 2 > 1 and "bbb" != "aaa" contains two conditions, connected by the and operator. The first condition 2 > 1 is true, as 2 is greater than 1. The second condition "bbb" != "aaa" is also true, because the strings "bbb" and "aaa" are not equal. Since both conditions are true and connected through and, the entire expression is evaluated as true.

In the second line "my string"[2] == "y" or "my string"[2] == "s" checks two conditions, connected by the or operator. The expression "my string"[2] refers to the third character of the string "my string", which is " ". The first condition "my string"[2] == "y" is false. The second condition "my string"[2] == "s" is also false. Therefore, since both conditions are false and they are connected through or, the overall expression is evaluated as false.

How should we interpret the outcomes? The initial print() issues a True response since both 2 > 1 and "bbb" != "aaa" hold true. The following print() yields False because the character at index 2 is neither 'y' nor 's' (it's actually a space).

Note
If you wish to reverse a boolean value, employ the not operator. For instance, not 1 == 1 results in False because 1 == 1 is True, and we've negated that to False.

Code Description

print(0 > 10 and 5 > 2): Outputs False, because although 5 > 2 is true, 0 > 10 is false. The and operator requires both conditions to be true, but since one of them is false, the whole expression is false.

print(2*2 == 5 or 1+1 != 3): Outputs True, because 2*2 == 5 is false, but 1+1 != 3 is true. The or operator requires at least one of the conditions to be true for the whole expression to be true.

Everything was clear?

Section 3. Chapter 3

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 Extended 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

Combining Conditions

In Boolean logic, two fundamental operators are OR and AND. What do they represent?

The OR operator checks if either of the conditions is true and returns True if so; otherwise, it returns False.

For example:

condition1 and condition2 yields True only when both conditions are True;
condition1 or condition2 gives True if at least one condition is True.

Note
You can also chain more than two conditions using these operators. Employ parentheses to clarify the order of operations.

As an illustration, consider these conditions:

Whether 2 exceeds 1 and if "bbb" isn't the same as "aaa";
If the character with index 2 in the string "my string" is either "y" or "s".

Code Description

Note
If you wish to reverse a boolean value, employ the not operator. For instance, not 1 == 1 results in False because 1 == 1 is True, and we've negated that to False.

Code Description

Everything was clear?

Section 3. Chapter 3