How to Validate User Inputs in Python | Input Validation in Python
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- Опубліковано 26 лип 2022
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Learn how to validate inputs entered by the user like not allowing inputs that contain certain characters, allowing only numbers and a lot more.
Complete list of what you'll learn:
- Allow only numbers
- Allow anything but numbers
- Not allow inputs that contain certain invalid characters
- Allow only certain values
If the video was helpful, let me know in the comments down below and also like the video so that other people can see it. Needles to say I really appreciate your support 💪❤️
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do you have a video on validaing forms with data? with pysimple gui for example I have tried a few way but it wont properly validate for me
@@gregoneill4391 Hello 😊 No, at the moment I don't have videos about PySimpleGUI.
I've been searching on how to select items from a list via input and the last part of your tutorial explained just that! Thanks very much 😁
Glad to hear that you found what you were looking for 😉💪 And thank you so much for the comment! 😍
Thank you for this, been running around in circles looking for the correct try..except.. for my float input for bmi calculation. Cant find clear explanation on the internet. This is veyr straightforward. Finally finished my assignment :)🤩☺☺ Subscribed🥰
Hello ☺️
Well done!! 🤩 I'm very happy that you could finish your assignment thanks to my video! 😍 🥳 Thank you for the subscription and welcome! 🥰
Very useful. I could not find a good explanation about it anywhere.
Thank you for the comment! 🤗 I'm happy it was useful 💪😊
Saved me on my exam! Cheers!
Hey Oskar! Glad to hear that, keep it up! 💪🔥
Thanks Brother Its Really Working
Thank you for the comment! 💪😍
🚀 Your video was incredibly helpful, Fabio! As a beginner developer, learning how to validate user inputs in Python seemed daunting, but your clear explanations and practical examples made it so much easier to grasp. Now I feel more confident in handling user inputs and ensuring the integrity of my programs. Thank you for sharing your expertise and making coding more accessible for everyone! 💪❤
Thank you so so much for your kind words! Really appreciated! ❤😊💪
Fabio, can you Store strings ‘stone’, ‘paper’, ‘scissors’ in a list
Ask the user to input their choice (validate)
Pick a random item from the list to represent the computer
Use if, elif commands to check who wins
Display who won on the screen.
Hello 😊
Yes, you can use one of the methods I explain in the video for the validation, so that the user can only enter one of the 3 values and then you can pick a random item using the built-in random module, have a look at that. 😉🤗
Why a question arrives when i do input?
and what if i want a certain word ? how can i make it so everything but this word gets marked as Invalid?
You can make a list of valid words, and check if the word entered is in that list, if so you go ahead, if not you ask for another word.
Hello Fabio! This is amazing tutorial for my understandig! I really enjoed it😀 I am new at coding, how can I implement that on the hangman game the one that you created in the other video. I need to make the code to handle empty and invalid inputs from users without losing lifes if you understand what I mean. I need that specific for the hangman game that you have created because I don’t know how to implement that by my own. Plaese help me 🙏🏼
Hello Meya, thanks for the comment! 😊 Glad you enjoyed it, I hope you are learning a lot with my videos.
In the Hangman game video at the line 33 and line 38 you get the "letter_user". Instead of just writing that, you need to write what I teach you in this video from min 11:25.
You literally just have to write the "tuple_valid_chars" (13:31) at the beginning of the program where you have the list of all the variables (e.g. line 22), then you need to replace the code on line 33 and 38 with the code from line 60 through 68 in this video (13:44). Of course "user_input" should be named "letter_user" and make sure you keep the right indentation.
I'm aware that you'll be writing the same lines of code twice, but to avoid that we would need to change the code a little bit and I can't go over it here.
I hope this helps, you should have all the information you need to make it work, remember that it's really important to try, fail, try again, etc, especially at the beginning, it's how you get better. 💪
Of course keep watching my videos and experiment with what I teach you as well 😉
Bye 😊
@@FabioMusanni thanks a lot for your answer😀 I’ll try and do my best. Promise to watch all your videos and keep ask questions 😉 you are wonderfull person and I wish you all the best in your career path!
Thank you very much for your kind words! ☺️ I love it when people ask questions, because it means they really want to learn and are watching my videos seriously. So your questions/comments will always be appreciated. Bye ☺️🤓
@@FabioMusanni well I have a question about long line, I get too long line error for the tuple_valid_char, I tried to use backslash to break the line but i doesn’t work for me. Do you have other advice how I can do? 😃
That's really strange. Do you get that error when running the code in the terminal or is it an error that the code editor gives you? Which editor are you using?
when i entered break it throws an error that break can be used only within a loop. I checked everything seems ok. How to fix it?
Hello 😊
That error is definitely caused by a wrong indentation. The "break" needs to be under the while loop but also indented at least once. So you don't want something like this:
while True:
break
But something like:
while True:
break
I trying to add to this to a calculator i am making in python. But i having difficulty applying it to the (num 1 and num 2 user input portion if the user does enter a integer. it just returns an error, its not attached to the user input portion. How do i error check num 1 and num 2 for non interger values. i did use try and error but just had indentation issues. Thanks
Hello Jay. Thanks for the comment. 😊
The first example in the video does exactly what you are asking. You need to use the try except block with a while True loop if you want to keep asking the user until they enter two valid numbers.
So, just write your two inputs (the one for num1 and the one for num2) in place of the "user_input" in the video and then try to convert both of them in the try block. If both of them are valid, then the program will continue and you can use those numbers below the try/except block, however, if at least one number is not valid, the program won't continue and the code in the except block will be run, so in the except block you can write what you want python to do if the user enters something wrong (in the video I just let them know with a message) 😊
Of course keep all the indentations in place, they are extremely important, and do things at steps, so don't write all of your code at once, just try this validation and if that works, then add your code so that you know if the problem is the validation or something else.
I hope this helps 💪😉
@@FabioMusanni Thank you that helped alot!! Writing a calculator program but trying to make it more functional with more variables the user can calculate. So i need a lot of ways to make sure the user can enter the right input and then end the program at anytime while its running.
No worries! 😉 Keep up the good work! 💪🔥
I ain't getting ValueError as a seperate feature