These are answers for exercises in the chapters. In programming, there's always more than one way to do things, so if your solution wasn't exactly like mine it's not necessarily wrong. Some Python users say that there should be only one right way, but that goal will never be fully reached.

1. 18996.20 €

>>>

```

1. Content of the file:

print(words * 1000)

```

1. You can compare the word against an empty string (`""` or `''`). In this example, the password is "secret".

Wrong password!

>>>

```py

running = True

print("Wrong password.")

```

```py

while input("Enter your password: ") != "secret":

print("Wrong password.")

print("Welcome!")

```

```py

if input("Enter your password: (3 attempts left) ") == "secret":

Welcome!

>>>

create your own functions with the `def` keyword. If you don't, I

highly recommend learning that first, and then moving to classes.

Python comes with a lot of classes that you are already familiar with.

Websites and process information about websites directly. Defining your

own object types like this is called **object-orientated programming**.

In Python, `pass` does nothing.

>>>

What happens if we set an attribute of the `Website` class to some value

instead of doing that to an instance?

confusing, which is why it's not recommended to use class attributes like

this. Use instance attributes instead, e.g. `stackoverflow.is_online = True`.

Let's define a function that prints information about a website.

`instance.method()`. This also works with built-in classes, for

example `'hello'.lower()` is same as `str.lower('hello')`.

Maybe we could define a method when we make the class instead of adding

it later?

Classes have many other magic methods too, but I'm not going to cover

them in this tutorial.

Don't do this:

print("You entered " + word + ".")

Here are some of the most important things covered in this tutorial.

Make sure you understand them.

- `__init__` is a special method, and it's ran when a new instance of a

class is created. It does nothing by default.

- Don't use classes if your code is easier to read without them.

hit the tab key. Your editor should also remove four spaces when you

hit backspace and there are four spaces before the cursor.

1. Create a file called `hello.py`, and open it in geany. Or create a

file in geany and save it as `hello.py`.

everything else should also have their own colors. This makes it much

easier to write code.

Geany has syntax highlighting by default. You can also install more

[color schemes](https://www.geany.org/Download/Extras#colors) if you

Advanced editors support plugins. You may find some of them useful.

On Debian-based GNU/Linux distributions, install the geany-plugins

package. See [the Geany website](https://plugins.geany.org/) for

When you have a problem with Python, you're not alone! There are many

places to ask for help in.

IRC is the oldest chatting service I know, but as of 2016, it's still

in use, and a great way to get help in Python. You don't need to

Don't do this:

<you> HEEEEELP MEEEEEEEEEEEEEEE!!!

<you> if a = b:

<you> ^

<you> SyntaxError: invalid syntax

Personally, I've never asked a question on any of these sites. Getting

help on IRC is much faster.

Use the official Python installer, it will install Python and IDLE for

you.

4. Select the "advanced installation" option, and make sure the py.exe

launcher gets installed.

I don't have an up-to-date copy of Mac OSX. If you would like to write

instructions for OSX, [tell me](contact-me.md).

You already have Python, there's no need to download anything.

know how to use Python with something else than PowerShell, command

prompt, a terminal or IDLE it's fine. Do whatever you want.

Use IDLE. Experienced Python users will say that IDLE is garbage, but

don't listen to them. These people want you to use "better"

The exact content of your Python's welcome message is probably different

than mine, it's ok.

On Windows. you should be able to run Python from a PowerShell window,

or a command prompt window if you don't have PowerShell. Open one of

When you're done reading, read the summary and make sure you've learned

everything.

- Now you should have some kind of idea about what programming is.

- Each value has a type, and you can find that out with `type(value)`.

Now we know how to make Python show text.

Now it's time to write some code into a file for the first time. In IDLE, go to File at top left and select New File, or just press Ctrl+N.

1. Write a program into a file that asks the user to write a word and then prints that word 1000 times. For example, if the user enters `hi` the program would reply `hihihihi...`.

2. Make it to print spaces between the words. It should be like `hi hi hi hi...`.

Variables are easy to understand. They simply **contain data**. Actually

they [point to data](https://www.youtube.com/watch?v=_AEJHKGk9ns), but

>>>

There are two Boolean values, True and False. In Python, and in many

other programming languages, `=` is assigning and `==` is comparing.

>>>

None is Python's "nothing" value. It behaves just like any other value,

and it's often used as a default value for different kinds of things.

because many things result in None, and it would be annoying to see

None coming up all the time.

So far we've used `==`, but there are other operators also. At this

point, this list probably looks awfully long, but it's actually pretty

they're more convinient once you get used to them.

There's also `is`, but don't use it instead of `==` unless you know