Kursinnhold

Introduction to Python (dev copy)

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: Outputting Positive, Negative or Zero

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: Completing 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

Common Dictionary Methods in Python

As you've probably noticed, dictionaries have unique characteristics that set them apart from lists and tuples. They also come with their own set of methods. Let's dive in.

len(d) - returns the number of key:value pairs in the dictionary d;
d.copy() - creates a copy of the dictionary d;
d.items() - provides all the key, value pairs from the dictionary d;
d.keys() - lists all the keys in the dictionary d;
d.values() - provides all the values from the dictionary d.

Wondering how to add new entries to a dictionary? Dictionaries don't utilize list methods like .append() or .extend(), and they don't support concatenation like strings. Instead, since dictionaries organize data in key-value pairs, you simply assign values using keys:

d[k] = e - assigns the value e to the key k. If the key k already exists in the dictionary, its associated value will be updated.

For example, let's add a couple of countries to our dictionary:


              12345678
            
# Initial dictionary
countries_dict = {'USA': (9629091, 331002651), 'Canada': (9984670, 37742154), 
            'Germany': (357114, 83783942)}

# Update dictionary with two countries
countries_dict["Brazil"] = (8515767, 212559417)
countries_dict["India"] = (3166391, 1380004385)
print(countries_dict)

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Seksjon 4. Kapittel 13