Gain insights into Python 3 by learning basic concepts like keywords and data types, and delving into 50 code puzzles that enhance your understanding of classes and functions.

This course acts as a stepping stone to becoming a Python master. Before getting into advanced concepts like classes and functions, the course begins with Python's basic concepts, such as keywords and data types. Later in this course, you'll be going through 50 code puzzles that will teach you different concepts in Python 3.

An Intro to Python 3

# Puzzle 7

**What is the output of the following code**?

> **Note**: Enter the output you guessed. Then, press the **Run** button, and your new Elo will be calculated. Don't forget to save your Elo rating.

#############################
## id 336
## Puzzle Elo 778
## Correctly solved 72 %
#############################

word = "galaxy"
print(len(word[1:]))


## Slicing


Slicing is a Python-specific concept for accessing a range of values in sequence types, such as lists or strings. It is one of the most popular Python features. Understanding slicing is one of the key requirements for understanding most existing Python codebases.

The idea of slicing is simple. Use the bracket notation to access a sequence of elements instead of only a single element. You do this via the colon notation of `[start: end]`. This notation defines the start index (included) and the end index (excluded).

> Forgetting that the end index is always excluded in sequence operators is a very common source of bugs.

For the sake of completeness, quickly look into the advanced slicing notation `[start:end:step]`. The only difference to the previous notation is that it allows you to specify the step size. For example, the command 'python'[:5:2] returns every second character up to the fourth character, i.e., the string `'pto'`.

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## `len()`

The `len()` function is a handy tool to get the length of built-in Python data types, such as strings, lists, dictionaries, or tuples.



Learn about the concepts of slicing, different string manipulation operators, a new way to concatenate strings, and the difference between float division and integer division.

Introduction

A Quick Overview of the Python Language

Fifty Code Puzzles

The Final Remarks

Puzzles 7 to 10

Puzzle 7

Slicing