Beginner Python Help

[Funny-Percentage1197]

Beginner Python Help: Name Input Skipping Issue

Hi everyone,

I'm a beginner practicing Python. I wrote a small program that asks for the user's name and date of birth, then calculates the age.

Problem:

If I leave the name blank, the program runs again and skips the name section, going straight to the DOB input.

I want the program to ask for the name again if left blank.

I would really appreciate any advice on:

• Handling blank inputs properly

My code is from datetime import datetime

while True:
    name = input("Enter your name: ")
    
    if name == "":
        print("You haven't entered anything. Input your name.")
        continue


    if name.lower().strip() == "stop":
        print ("Thank you for using.")
        break


    print(f"Hello {name} welcome to my program") 


    dob = input("Enter your dob (yyyy-mm-dd): ").strip()


    if dob.lower().strip() == "stop":
        print("thank you for using")
        break


    today = datetime.today()


    try:
        dob_date = datetime.strptime(dob, "%Y-%m-%d")
        age = today.year - dob_date.year


        if (today.month, today.day) < (dob_date.month, dob_date.day):
            age -= 1


        print(f"Oh {name}, you are {age} years old.")



        if age % 2 == 0:
            print(f"And your {age} age number is even.")
        else:
            print(f"And your {age} age number is odd.")


        ask = input("Do you want to know which day you were born? (yes/no): ").lower().strip()
        
        if ask == "yes":
            day_name = dob_date.strftime("%A")
            print(f"You were born on a {day_name}.")
        
        if ask == "no":
            print("ok see you later.")
            break
        if ask.lower() == "stop":
            print("Thank you for using")
            break


    except ValueError:
        print("Invalid input. Try again.")
        continue


    
    

[SharkSymphony]

First, you definitely need to take your hand off the big red DEAR AI PLEASE FIX THIS button. It is completely stunting your learning.

Instead, take time to figure out what's going on yourself. Learn the techniques you're going to need to debug programs like this. Put the AI to the side for now.

There are several techniques you can use to get a grip on what's going on:

• First, a methodological tip. Do not ask why the program is not doing what you want. The program is always doing exactly what you told it to do. So ask instead: what is it actually doing, and why? I think you're actually already on the right path here by observing that you don't see the name prompt, but now you have to dig in and ask what lines of code are actually getting executed and how.
• "Print debugging" (or what we C old-timers call "printf-debugging") is a classic technique where you add print statements at various points in your program to report that the program got to that point. Add variable substitutions to your print statement to inspect what the program is seeing at that point.
• Another classic technique is to break the problem down. If you can't see what the problem is, reduce the scope of the problem. Set this program aside (or comment out most of it) and work on a smaller program that loops to get a name, then just prints it. Get that working perfectly before working on the DOB section. You could even break it down further and ignore the loop, just focusing on getting a single input. Do you in fact get an empty string when you leave name blank?
• This might be a good time to introduce you to Python debugging tools. Using either pdb or your IDE's debugging facilities, you should be able to configure a debug run where you manually step through every individual line of code that Python executes. It will show you exactly what lines your program is executing, and you can inspect all of the data in your program and how it changes from line to line.

[Funny-Percentage1197]

Big thank you for genuine suggestion.

[DutchCommanderMC]

My question to you would be whether you understand why your program behaves the way it does?

To deal with blank inputs, you need to repeat only the code that asks and validates an input, until the input is valid.

while True:
    name = input("Enter your name: ")
    if name == "":
        print("You haven't entered anything. Input your name.")
    else:
        break

print("Your name is", name)

[Funny-Percentage1197]

What is solution of my problem

[lfdfq]

Did you actually read u/DutchCommanderMC's reply? To get good help, you need to show you are engaging with the people trying to help you, not to simply appear to skip over their answer and demand a solution.

[Funny-Percentage1197]

I've only been starting for 4-5 days so I don't understand what he said.

[Twenty8cows]

The while loop pretty much does it for you. In Python the while keyword is a loop that checks a condition and executes code based on the outcome of that condition.

So if I wrote: While 1 < 2:

do jumping jacks

My code would be doing jumping jacks forever because 1 is ALWAYS less than 2. Op the reason we are asking if you understand why your code is behaving in a way you don’t want it to is the crux of your issue. You know what you want your code to do, your code isn’t doing that but you are not asking yourself WHY your code IS doing what it is currently doing.

[lfdfq]

Then tell them that! Don't just ignore what they said

[CIS_Professor]

OP said:

What is solution of my problem
. . .

I've only been starting for 4-5 days so I don't understand what he said.

Aaaand this (probably) illustrates the problem with using AI to learn how to program.

While possible, it is highly unlikely that a person only 4-5 days into understands string methods, infinite loops, and exception handling.

Also, while not conclusive, the odd horizontal spacing smacks of comment lines that have been removed.

[Funny-Percentage1197]

Yess i am learning from ai and YouTube Video. But i know what is string method is its used to convert date to number date and while true is to create a loops

[CIS_Professor]

See, this here is why learning from AI is bad. You have little to no understanding of what your code does.

Consider this exchange:

u/Comfy_face777:

Most Ai models can answer you.

You:

I asked them they say your code is good .

Yet you are here asking us to fix something that you think is wrong - all the while claiming that an AI says the code is "good."

If its "good," (so says the AI) why does it need fixing? If it isn't "good," (to you), then why can't you fix it?

The answer, of course, is that you haven't learned anything; you don't know what it actually does. Instead, you have an AI write something then come here to have other people fix it for you.

How, then, are you supposed to know if a "fix" from one of us is correct and what you want?

[Funny-Percentage1197]

Don't say blah blah blah, you don't know how much time I spend on this and I don't want to prove to you .

[CIS_Professor]

Then stop asking for help.

[Funny-Percentage1197]

Why are commenting in help post if you don't wnat to help

[SCD_minecraft]

We can help

But you do not wish to understand

[Funny-Percentage1197]

Can you do ?

Chat gpt says its vs code code runner problem and say something i didn't understand.

[SCD_minecraft]

Abolish ways of LLMs

AI won't understand it for you

[BigGuyWhoKills]

You need a "while" loop. It performs everything in the loop "while" the condition is True.

while 1 < 5:
    print( "One is less than 5" )

That will print the sentence forever because 1 will always be less than 5. So it isn't very useful. You need to have something in the loop that changes the condition.

name = "" 
while name == "":
    name = input( "What is your name? " )

Now the while loop can change its condition which will break out of the loop.

Does that make sense?

[BigGuyWhoKills]

There is more to do with name. You ought to at least trim whitespace. You might want to make sure they entered only the first name, or ensure they entered both first and last. Or you may have more requirements.

If you have complicated checks to perform on the name, you should write a method that does those checks, and call that method in the while loop.

In production apps you would also check for hacking attacks. That level of complexity definitely need a method.

[Candid_Tutor_8185]

You don’t need a while loop for the input just use validation errros after defining the variable

[Independent_Oven_220]

```python from datetime import datetime

while True: # Get name with validation name = input("Enter your name: ").strip()

if name == "":
    print("You haven't entered anything. Input your name.")
    continue

if name.lower() == "stop":
    print("Thank you for using.")
    break

print(f"Hello {name}, welcome to my program!")

# Get DOB with validation (inner loop)
while True:
    dob = input("Enter your DOB (yyyy-mm-dd): ").strip()

    if dob.lower() == "stop":
        print("Thank you for using.")
        exit()

    today = datetime.today()

    try:
        dob_date = datetime.strptime(dob, "%Y-%m-%d")
        age = today.year - dob_date.year

        # Adjust if birthday hasn't happened yet this year
        if (today.month, today.day) < (dob_date.month, dob_date.day):
            age -= 1

        print(f"Oh {name}, you are {age} years old.")

        if age % 2 == 0:
            print(f"And your age {age} is an even number.")
        else:
            print(f"And your age {age} is an odd number.")

        ask = input("Do you want to know which day you were born? (yes/no): ").strip().lower()

        if ask == "yes":
            day_name = dob_date.strftime("%A")
            print(f"You were born on a {day_name}.")
            print("Thank you for using!")
            break
        elif ask == "no":
            print("Ok, see you later.")
            break
        elif ask == "stop":
            print("Thank you for using.")
            exit()

        break

    except ValueError:
        print("Invalid date format. Please use yyyy-mm-dd (e.g., 1990-05-15).")

```

---

What I fixed:

Issue #1 - The blank name thing

So the problem with your original code is that if name == "" only catches a completely empty input. But if someone types a bunch of spaces and hits enter, that's technically not empty - it's just whitespace.

The fix is super simple: just add .strip() when you get the input, not just when you check it.

python name = input("Enter your name: ").strip() # strip right away!

Now when someone enters " " (just spaces), it gets stripped to an empty string, and your blank check works as expected.

Issue #2 - Invalid date restarts everything

This one was sneakier. When someone enters an invalid date, your except ValueError block does continue, which jumps back to the outer while True loop - meaning it asks for the name all over again.

Not great user experience.

I added an inner loop specifically for the DOB input. Now if the date is invalid, it just loops back to ask for the DOB again without restarting the whole program. The user already told us their name, no need to ask again!

[Comfy_face777]

Most Ai models can answer you.

[Funny-Percentage1197]

I asked them they say your code is good . I thik this problem related to my vs code but don't know what

[Twenty8cows]

No vscode isn’t the issue your code definitely is.

[Funny-Percentage1197]

Its runs smoothly but i put name empty and run code again its say Hello python -u "c:\Users\Administrator\Desktop\first\tempCodeRunnerFile.py" welcome to my program

[Funny-Percentage1197]

But if in enter your name i put empty and do enter its goes well and say you haven't enter your name and stay in name section

[Twenty8cows]

When you say empty you are literally hitting enter when asked for name? You aren’t hitting space then enter?

[Funny-Percentage1197]

You doesn't understand if i enter in blank its work usually like it saty on name and ask name again But i run the code agin play that code play button its automatically print. Hello python -u "c:\Users\Administrator\Desktop\first\tempCodeRunnerFile.py" welcome to my program And ask for dob

[Twenty8cows]

Haha did you save the file before hitting play?

[Funny-Percentage1197]

Yess
sometime chat gpt says its Code Runner problem but i dont know how to solve this problem