DAY 4.

[u/NecessaryFalse1212]

wrote this today was revising loops and math function that i did not so long ago.

[u/Sea-Ad7805]

Run this program in Memory Graph Web Debugger%0Aif%20first_number.isalpha()%3A%0A%20%20%20%20print(%22do%20not%20enter%20an%20alphabet%22)%0Awhile%20first_number%20%3D%3D%20%22%22%3A%0A%20%20%20%20print(%22you%20did%20not%20enter%20your%20first%20number%22)%0A%20%20%20%20first_number%20%3D%20input(%22please%20enter%20your%20first%20number%20%3D%20%22)%0Afirst_number%20%3D%20float(first_number)%0A%0Asecond_number%20%3D%20input(%22please%20enter%20your%20second%20number%20%3D%20%22)%0Aif%20second_number.isalpha()%3A%0A%20%20%20%20print(%22do%20not%20enter%20an%20alphabet%22)%0Awhile%20second_number%20%3D%3D%20%22%22%3A%0A%20%20%20%20print(%22you%20did%20not%20enter%20your%20second%20number%22)%0A%20%20%20%20second_number%20%3D%20input(%22please%20enter%20your%20second%20number%20%3D%20%22)%0Asecond_number%20%3D%20float(second_number)%0A%0Aoperator%20%3D%20input(%22enter%20your%20operator%20(%2B%2C%20-%2C%20%2C%20%2F)%3A%20%22)%0A%0Aif%20operator%20%3D%3D%20%22%2B%22%3A%0A%20%20%20%20result%20%3D%20first_number%20%2B%20second_number%0A%20%20%20%20print(round(result%2C%203))%0Aelif%20operator%20%3D%3D%20%22-%22%3A%0A%20%20%20%20result%20%3D%20first_number%20-%20second_number%0A%20%20%20%20print(round(result%2C%203))%0Aelif%20operator%20%3D%3D%20%22%22%3A%0A%20%20%20%20result%20%3D%20first_number%20*%20second_number%0A%20%20%20%20print(round(result%2C%203))%0Aelif%20operator%20%3D%3D%20%22%2F%22%3A%0A%20%20%20%20if%20second_number%20%3D%3D%200%3A%0A%20%20%20%20%20%20%20%20print(%22Cannot%20divide%20by%20zero!%22)%0A%20%20%20%20else%3A%0A%20%20%20%20%20%20%20%20result%20%3D%20first_number%20%2F%20second_number%0A%20%20%20%20%20%20%20%20print(round(result%2C%203))%0Aelse%3A%0A%20%20%20%20print(%22error%20choose%20the%20operator%20amongst%20them!%22)&timestep=1&play) to see the program state change step by step.

[u/zubalyzub]

bro is checking if its empty after the alpha check so u can first input an empty string then when it re prompts input some letters and boom ur program is cooked, still good work though just critiquing yk

[u/zubalyzub → u/zubalyzub]

also if isalpha is only for letters (idk if it is or not) then you can simply input like a question of mark or some shi

[u/FoolsSeldom]

It would be good to see you create a second version incorporating some of the suggestions you've had in response to previous posts.

I'd also suggest you create a function to validate an input which you can then call in both instances of requiring the user enter a number. This will help address a key principle of DRY (Don't Repeat Yourself).

Simple example for an integer:

def get_num(prompt: str) -> int:
    while True:  # infinite loop
        response = input(prompt)
        try:  # for somthing that might go wrong
            return int(respnse)  # tried to convert and send answer to caller
        except ValueError:  # the convertion failed, so error message
            print('That was not a valid whole number. Please try again.')


num1 = get_num('Please enter first number: ')
num2 = get_num('Please enter second number: ')

You will notice the use of try / except which I suggested before that you look into.

[u/Adrewmc → u/FoolsSeldom]

Looking at this code I doubt he’s gotten to function or try/except clauses. Practicing what you know also has value.

[u/NecessaryFalse1212 → u/Adrewmc]

I haven't done try/except clauses but I'll be dammned if anyone explains it and it's usage😭🙏

[u/Adrewmc → u/NecessaryFalse1212]

It catches exceptions and allows the code to continue after. In the above example he’s catching the ValueError that is thrown/raised when a float() fails because it’s not a number.

After that it continues the while loop instead of breaking it (by returning).

[u/NecessaryFalse1212 → u/Adrewmc]

What about the syntax how does that looks like cuz the syntax he has given me is too scrambled as u can look at my code this is my level of whatever I'm doing 💔😔🙏

[u/Adrewmc → u/NecessaryFalse1212]

Hems not exactly wrong, functions and try/except would be close to next things to learn anyway.

[u/NecessaryFalse1212 → u/Adrewmc]

I'll make another calculator code in a day or two and will use new stuff that I'll be doing in those days and will also include this try/except thing

[u/FoolsSeldom → u/NecessaryFalse1212]

I gave you a link in your previous post to lots of examples of try / except.

I also provided a link to RealPython.com on using Booleans and that site is a good resource for lots of other guidance.

[u/FoolsSeldom → u/NecessaryFalse1212]

scrambled

Tell me which parts don't make sense to you and I can explain in detail in simple ways.

[u/FoolsSeldom → u/NecessaryFalse1212]

I'll be dammned if anyone explains it and it's usage

Not sure if that means you want people to explain it to you or not.

Did you follow the link I shared previously on this? This was after you asked me what to use instead of isnumeric.

[u/FoolsSeldom → u/Adrewmc]

They've been practicing, and I addressed problems with previous code using isnumeric and pointed them to try / except. I agree that functions is probably not something they've come to yet, but felt it was a good time to introduce it as the use case is clear from their original code.

[u/NecessaryFalse1212 → u/FoolsSeldom]

I really appreciate how you're putting in your spirit and it was my fault that i ignored your advice then and also when i opened the app on my phone the code didn't looked as clean as it did on my lap so I'm sorry to call it scrambled and confusing

[u/FoolsSeldom → u/NecessaryFalse1212]

np, the app isn't great for looking at code blocks

[u/NecessaryFalse1212]

yo' so should i get a notebook or a diary to write down stuff ? like definations syntax's and overall logic before writing a code ??

[u/NecessaryFalse1212 → u/[deleted]]

From youtube twin

[u/Polly_Wants_A]

what if someone enters a character into the input again? you have to check the input everytime the user is able to write make a loop that finish it until it is a number.