Introduction to Python

Course Content

Introduction to Python

Introduction to Python

1. First Acquaintance with Python

The Very First Steps in Python How to Use Comments for Readability Perform Simple Math in Python Handle More Challenging Math in Python Bringing Python Fundamentals Together

2. Variables and Types in Python

How to Store Numbers in Python Python Naming Rules for Variables How to Work with Variables in Python Data Types in Python Challenge: Converting Kilometers to Miles Store Text with Strings in Python String Indexing in Python Negative Indexing and String Length in Python String Slicing in Python Challenge: Retrieving Letters from String String Concatenation in Python

3. Conditional Statements in Python

Boolean Data Type in Python Challenge: Working with Comparison Operators How to Combine Conditions in Python Challenge: Working with Logical Operators Membership Operators and Type Comparisons in Python How to Use if/else Expressions in Python Challenge: Running a Grocery Store Challenge: Creating Odd and Even Logic if/elif/else Expressions Challenge: Running Grocery Store Extended Challenge: Weather Adviser

4. Other Data Types in Python

Python Lists Common List Methods in Python Challenge: Updating List Nested Lists in Python Challenge: Retrieving Information from Nested List Python Tuples Common Tuple Methods in Python Challenge: Updating Tuple Nested Tuples in Python Challenge: Retrieving Information from Nested Tuple Python Dictionaries Challenge: Creating Dictionary Common Dictionary Methods in Python Challenge: Updating Dictionary

5. Loops in Python

Explore the while Loop in Python Challenge: Working with the While Loop Explore the for Loop in Python Challenge: Working with the For Loop Range Function in Python Challenge: Using the Range Function How to Iterate Over Indexes in Python Explore Nested Loops in Python

6. Functions in Python

Built-in Functions in Python Challenge: Converting Heights How to Create Functions in Pythons Challenge: Writing First Function Use of if/else Statements in Python Functions Challenge: Identifying Positive Values Functions Without Return in Python Challenge: Creating Logging Function Modifying Functions in Python Challenge: Updating Logic of the Function Lambda Functions in Python Challenge: Creating Lambda Function

Store Text with Strings in Python

To store text in Python, you need to surround it with quotation marks. For instance, you can store the word "Python" in the language variable and then display it:


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# Save string within variable
language = 'Python'

# Output string
print(language)

Variables that store text are known as strings. A string is a sequence of characters used to represent text in Python. Strings are enclosed in either single quotes (') or double quotes (").

Although strings can contain numbers, they are treated as text, meaning you cannot perform mathematical operations on them directly. To use a number stored as a string in calculations, you need to convert it to a numeric type first.


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hour = '16'

print(hour)

You can use either single quotes (' ') or double quotes (" ") to define a string in Python—both work the same way. However, if you need to include one type of quote inside the string, you have a few options.


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# Using double quotes outside
message = "It's a beautiful day!"
 # Using single quotes outside
greeting = 'He said, "Hello!"'

# Use \ to escape single quote inside single-quoted string
message = 'It\'s a beautiful day!'
# Use \ to escape double quote inside double-quoted string
greeting = "He said, \"Hello!\""

Everything was clear?

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Section 2. Chapter 6

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