🔒 trying to make a calculator

[zenith dagger]

i use pycharm since yt said it was the best for beginners. but when i try to combine the adding and subtracting options it fails
my code:
print('you can choose between 4 options: '
'adding: 1, '
'substraction: 2, , '
'division: 3, '
'multiplication: 4')
form = int(input('choose an option: '))
if form == 1: num1 = input('choose a number: ')
num2 = input('choose another one: ')
result = float(num1) + float(num2)

print(result)

if (form == 2): num3 = input('choose a number: ')
num4 = input('choose another one: ')
result = float(num3) - float(num4)

print(result)

keeps saying num1 or num 3 is undefined but what does that mean?

[marsh hawk]

@zenith dagger

Python help channel opened

Remember to:

• Ask your Python question, not if you can ask or if there's an expert who can help.
• Show a code sample as text (rather than a screenshot) and the error message, if you've got one.
• Explain what you expect to happen and what actually happens.

:warning: Do not pip install anything that isn't related to your question, especially if asked to over DMs.

Closes after a period of inactivity, or when you send !close.

[abstract mural]

When you have an if statement, you need to indent the code beneath it.

[pallid aurora]

I WAS GOING TO SAY THAT

[abstract mural]

Like I said already, please don't shout

Anyway, indentation is important in Python.

[pallid aurora]

anyways yea, indent is one of the most important things of this language

[pallid aurora]

lol here we go again

[abstract mural]

The whitespace is the same thing as some curly braces in C++ or javascript

[pallid aurora]

no extra indentation, no missing indentation

[abstract mural]

So, the reason your editor is raising these flags is because you haven't indented the lines where you are initialising num1 and num3.

[pallid aurora]

yea so you dont really have to indent your code- but that is just not really recommended

[abstract mural]

I would recommend adding a new line after the if statement too

Doing if form == 1: num1 = input('choose a number: ') in one line isn't really recommended.

Instead,

if form == 1:
  # Indent using Tab
  num1 = input('choose a number: ')

[zenith dagger]

whats indenting

oh

nvm

[pallid aurora]

four spaces or tab

[zenith dagger]

alr

so where do i put that

[abstract mural]

After the if statement.

[zenith dagger]

the indent

okay

[pallid aurora]

before every line in the if statement

[abstract mural]

Whenever you want something to run after the if statement, indent those lines.

[pallid aurora]

[zenith dagger]

alr thanks

[abstract mural]

So instead your code might look a little like

if form == 1: 
    num1 = input('choose a number: ')
    num2 = input('choose another one: ')
    result = float(num1) + float(num2)
    print(result)

[zenith dagger]

ah

yes

ill try to run it

YES

it works

thank you

[abstract mural]

One small thing, you don't really have to print result each time.

[zenith dagger]

oh huh

wdym

[abstract mural]

Instead, you can make it look a little bit like

form = int(input('choose an option: '))
if form == 1: 
    #code

if (form == 2): 
    #code

print(result)

[pallid aurora]

print('you can choose between 4 options: '
      'adding: 1,  '
      'substraction: 2, , '
      'division: 3, '
      'multiplication: 4')
form = int(input('choose an option: '))
num1 = int(input('first: '))
num2 = int(input('second: '))
match form:
    case 1:
        print(num1 + num2)
    case 2:
        print(num1 - num2)
    case 3:
        ...

this will be better

[abstract mural]

Don't... do that. It's best not to do match... case as a beginner.

[pallid aurora]

why...you...use...ellipsis...all...over

[abstract mural]

Especially if indentation is an issue that you are having. Just ignore it for now.

[zenith dagger]

whats match

[pallid aurora]

basically same as if elif elif elif ...

[zenith dagger]

aha

[abstract mural]

You don't need to worry about it now.

[zenith dagger]

alr

[pallid aurora]

yea but it is really important in otehr languages in C and JS which is named switch~case for some reason

[violet night]

It would be named differently in those cases because it's different in C and JS. In those languages, switch does exact == checks to decide which branch to follow. Python's match uses pattern matching.

[pallid aurora]

👍

[zenith dagger]

i have no idea what this all means lmao

sounds important

[pallid aurora]

(also, the ... there is called an ellipsis which is used to mark unfinished code

if you know it you know it)

[abstract mural]

Not at your stage. Right now, just make sure your indentation is on point.

[zenith dagger]

alr

i made the calculator work

[violet night]

In other languages, switch can "jump" to the correct case without needing to check all the previous ones, which is more efficient. In Python, match is basically just an if statement.

But yes, I wouldn't worry about match yet.

[pallid aurora]

sorry i didnt get your skill lvl

[zenith dagger]

like

fully

[abstract mural]

It's crucial in Python, especially when you start to nest things.

[pallid aurora]

ohh so its why you nneed to break it manually

[zenith dagger]

nest things?

[pallid aurora]

in otehr languages

[pallid aurora]

basically use if statements inside of a if statements inside of a if statement-

repeating that

[zenith dagger]

oh damn

anyway

what should i try next to expand my skills

[abstract mural]

if condition:
    if condition:
        ...

[pallid aurora]

so

if something:
    if something2:
        if something3:
            if something4:
                # go on

[zenith dagger]

quick question how do yall make the weird black boxes with code

[abstract mural]

!code

[marsh hawk]

Formatting code on Discord

Here's how to format Python code on Discord:

```py
print('Hello world!')
```

These are backticks, not quotes. Check this out if you can't find the backtick key.

For long code samples, you can use our pastebin.

[pallid aurora]

!code

[abstract mural]

Read the embed.

[pallid aurora]

f

wait why doesnt those work

!paste

[marsh hawk]

Pasting large amounts of code

If your code is too long to fit in a codeblock in Discord, you can paste your code here:
https://paste.pythondiscord.com/

After pasting your code, save it by clicking the Paste! button in the bottom left, or by pressing CTRL + S. After doing that, you will be navigated to the new paste's page. Copy the URL and post it here so others can see it.

[pallid aurora]

what???

[abstract mural]

The backtick is the key under the escape.

[pallid aurora]

then whyd that not work

[pallid aurora]

`

[abstract mural]

I already did it. There is a cooldown.

[pallid aurora]

oh ok

[zenith dagger]

so you put !code and you put a bunch of code behind it?

[pallid aurora]

uh no.

[abstract mural]

Read the embed.

[zenith dagger]

oh yea

[pallid aurora]

```py
Your code goes here
```

[zenith dagger]

i see it

so

[pallid aurora]

Your code goes here

ok i am going to sleep

bye

[zenith dagger]

py print( result )

[abstract mural]

not quite

[zenith dagger]

ye

hmm

[abstract mural]

Make sure the ```py

[zenith dagger]

so

py print( result )

no

huh

[abstract mural]

No

```py

You need a newline after ``

[zenith dagger]

```print( result )```

almost

print( result )```

yes

[marsh hawk]

Python help channel closed

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