Introduction to Python(ihor)

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Introduction to Python(ihor)

Introduction to Python(ihor)

1. First Acquaintance with Python

The Very First Steps in Python How to Use Comments for Readability Perform Simple Math in Python Handle More Complex 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 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 Python 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

Membership Operators and Type Comparisons in Python

Python's membership operators check whether a sequence exists within an object, such as strings, lists, or tuples. The in operator returns True if the sequence is found, while the not in operator returns True if it is not.


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# Define a string containing all the vowels
vowels = "aeiou"

# Check if the character 'n' is present in the `vowels` string
print('n' in vowels) 

# Check if the character 'a' is not present in the `vowels` string
print('a' not in vowels)

In addition to checking membership, it's often necessary to verify the type of a variable before performing certain operations. For example, dividing a non-numeric value would cause an error. Python provides two ways to check the type: is and isinstance()


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# Initial number
num = 3.5

# Checking if num is an integer using `is` operator
print(type(num) is int)

# Check if the variable is an integer using the 'isinstance' function
print(isinstance(num, int)) # The second approach

Both methods return False because 3.5 is a float, not an int. The is operator checks for exact type matching, while isinstance() also supports checking against multiple types or inheritance.

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Avsnitt 3. Kapitel 5

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