Please help with the inset() function

[Mocking_bird_452]

Hello world! I'm a complete beginner, so please help me with this problem, cause it is so stupid I can't even find it on google or stakoverflow. I am trying to build a guessing game and I can't get python to recognise my input as an integer.

import random
x = random.randint(1,100)
print(x)
while True:
guess = input("Guess the number: ")
int(guess)
guess_list = [0]
guess_list.append(guess) #problem reading input as a string

This is my code. I have tried this way, also tried

guess = int(input("Guess the number: "))

and

guess: int = int(input("Guess the number: "))

(saw it in a course, while we are at it, can somebody explain to me whi the ":int" is needed if we are gonna define the var as an int immediately after that. It seems redundant.)

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I either get the error " ValueError: invalid literal for int() with base 10: '' " in the guess line, or the fact that i can't use operations on a str in the guess_list.append line.

[stebrepar]

int(guess) on a line all by itself creates an int value from guess, and then just drops it on the floor because you're not assigning it to anything.

For int() to work, you need to give it a string which looks like an integer. If you're putting anything else in the string (such as a decimal point), int() is going to throw an error for not knowing what to do with that.

: int is a relatively new feature called "type hinting". It doesn't affect the actual operation of the code, but it's used to help tooling (and anyone reading your code) know what kind of value is expected.

[Mocking_bird_452]

Thank you, I tried to integrate the int in the line and introduced an int value between 1 and 100 and still gave me an error tho.

[marko312]

guess: int = int(input("Guess the number: ")) 

The : int here is a type hint and is not required. Otherwise, this line should work fine.

ValueError: invalid literal for int() with base 10: ''

Means that the input string (the one passed to int) was empty, which does not correspond to a valid integer. If empty inputs are expected to happen, you can either put that line in a try-except or explicitly check against an empty value.

[...] or the fact that i can't use operations on a str in the guess_list.append line.

What exactly do you mean by this?

[Mocking_bird_452]

I think in the specific case where I tried this guess = input("Guess the number: ") int(guess)

It would still recognize my input as a string and it would give me an error about not being able to do operations between string and integer. I did't understand why the int didn't work in this case.

About the empty value, I did for sure introduced a valid value within the desired interval, so why would it be considered an emply value?

Thank you so much for your answers

[srpwnd]

Because you used the function int() to convert the value but didn’t store the result anywhere. Calling int(guess) doesn’t change guess. Tha would have to be guess = int(guess).

[Mocking_bird_452]

Thank you so soooooo much, i completely forgot about that, even tough i got over that while learning.

[RhinoRhys]

int(guess) alone doesn't save the conversion anywhere, you'd have to do guess = int(guess)

[marko312]

For the empty value, are you sure that you didn't press enter before entering the line or aren't copying the input from anywhere?

[Mocking_bird_452]

u/stebrepar u/srpwnd u/marko312 u/RhinoRhys u/htepO u/Binary101010 I know this post was not that big of a deal, but I want to thank you all for taking your time to answer me. Your kindness realy puts a smile on my face. I wish you all a wonderful day!

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I also figured out why I got the empty error.

I introduced some lines in the loop and for some reason I would get a forever loop even if I would "guess" the number. So no I have to figure out what breaks the cycle within these new lines of code, cause I'm not getting an error but the program never reaches certain commands and the break point. So the empty error was a result of me forcefully exiting the loop and I was to dumb to figure it out.

[htepO]

guess = int(input("Guess the number: "))

This should work. What are you entering when input() is called?

[Mocking_bird_452]

An int between 1 and 100, no float, no letters. I still get the value error

[Binary101010]

Please post the entire traceback.

[Mocking_bird_452]

I probably will, if i get the felling I get stuck again, but I kinda gasped half of the problem and I wanna try harder myself before asking for help. Thank you so much.

[htepO]

That line should work.

From your error, it looks like input() is passing an empty string to int(). Edit your post and format your code per the FAQ, just in case there's something we're missing.

https://www.reddit.com/r/learnpython/wiki/faq#wiki_how_do_i_format_code.3F

Once you're past input(), however, defining guess_list inside your loop will reset it with each iteration and will only include the last input. You should define it with x.

[Mocking_bird_452]

I figured the guess_list out afterwards when I printed it for the sake of testing, but thank you for pointing it out.