while true loop python user input - Brave Search

Input prompt within a while-true loop [duplicate]

stackoverflow.com › questions › 50498557 › input-prompt-within-a-while-true-loop

You want to repeat try-except... And the thing you want to try is input(), so you need to put basically all the code within the loop.

And remove the lower(), or convert to "a" and "n"

while True:
    try:
        name = input ("What is your name ? ").strip()
        if name.startswith("A"):
            print("message for A")
            break       
        elif name.startswith("N"):
            print("message for N")
            break
        else:
            print("Sorry, my only purpose is to talk to N and A")
    except ValueError:
        print ("Sorry, my only purpose is to talk to N and A")

Answer from OneCricketeer on Stack Overflow

realpython.com › python-while-loop

Python while Loops: Repeating Tasks Conditionally – Real Python

March 3, 2025 - To see this construct in practice, ... = "secret123" attempts = 0 while True: password = input("Password: ").strip() attempts += 1 if password == correct_password: print("Login successful!...

w3schools.com › python › python_while_loops.asp

Python While Loops

Python Examples Python Compiler ... Certificate Python Training ... With the while loop we can execute a set of statements as long as a condition is true....

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freecodecamp.org › news › while-loops-in-python-while-true-loop-statement-example

While Loops in Python – While True Loop Statement Example

July 19, 2022 - Something to note here is that the user input by default is case-sensitive, which means that if the user enters 'python' instead of 'Python' they still won't be able to continue. To fix this, you can use a string method such as .capitalize() to capitalize the first letter of the word the user enters. user_input = input("Please enter the secret keyword: ").capitalize() Next, it is time to construct the while loop.

stackoverflow.com › questions › 50498557 › input-prompt-within-a-while-true-loop

python - Input prompt within a while-true loop - Stack Overflow

You want to repeat try-except... And the thing you want to try is input(), so you need to put basically all the code within the loop.

And remove the lower(), or convert to "a" and "n"

while True:
    try:
        name = input ("What is your name ? ").strip()
        if name.startswith("A"):
            print("message for A")
            break       
        elif name.startswith("N"):
            print("message for N")
            break
        else:
            print("Sorry, my only purpose is to talk to N and A")
    except ValueError:
        print ("Sorry, my only purpose is to talk to N and A")

discuss.python.org › python help

While true loop, i want to give the user another reply for his second try - Python Help - Discussions on Python.org

June 14, 2023 - In this case, if the user puts 'N' he will get back to the first line, right? if the user puts again 'N', I want to give him another reply for his second retry answer = input ("Stranger: Can you provide us your information ?(Y/N): ") .upper() while True : if answer == “Y” : break if answer == “N”: print ("please reconsider your your answer ") Continue else: print ("bruv, It is a Yes or No question!!

boardinfinity.com › blog › use-while-true-in-python

Use While True in Python | Board Infinity

August 13, 2025 - They are commonly used to create infinite scroll pages and interactive programs, where they are used to continuously check for new content or accept and process user input. You can create more dynamic and interactive programs in Python by ...

geeksforgeeks.org › how-to-use-while-true-in-python

How to use while True in Python - GeeksforGeeks

May 27, 2025 - Using while True creates an infinite loop that runs endlessly until stopped by a break statement or an external interruption. Its main uses include: Continuously prompt user input until valid data is entered

freecodecamp.org › news › python-while-loop-tutorial

Python While Loop Tutorial – While True Syntax Examples and Infinite Loops

November 13, 2020 - We will the input() function to ask the user to enter an integer and that integer will only be appended to list if it's even. ... # Define the list nums = [] # The loop will run while the length of the # list nums is less than 4 while len(nums) ...

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python-forum.io › thread-32066.html

While True Problem

I am new to python and I am trying some practice problems and I can get this one to work: -Prompt user for an integer between 1 and 10 and re-prompt if the input is not in this range -Print that many '&', one per line I know I need to use while Tru...

programiz.com › python-programming › while-loop

Python while Loop (With Examples)

If the condition is True, body of while loop is executed. The condition is evaluated again. This process continues until the condition is False. Once the condition evaluates to False, the loop terminates. Tip: We should update the variables used in condition inside the loop so that it eventually ...

stackoverflow.com › questions › 3754620 › what-does-while-true-mean-in-python

syntax - What does "while True" mean in Python? - Stack Overflow

while True means loop forever. The while statement takes an expression and executes the loop body while the expression evaluates to (boolean) "true". True always evaluates to boolean "true" and thus executes the loop body indefinitely. It's an idiom that you'll just get used to eventually! Most languages you're likely to encounter have equivalent idioms.

Note that most languages usually have some mechanism for breaking out of the loop early. In the case of Python it's the break statement in the cmd == 'e' case of the sample in your question.

my question: while WHAT is True?

While True is True.

The while loop will run as long as the conditional expression evaluates to True.

Since True always evaluates to True, the loop will run indefinitely, until something within the loop returns or breaks.

reddit.com › r/learnpython › using a while loop to ask the user (y/n) ?

r/learnpython on Reddit: Using a while loop to ask the user (Y/N) ?

October 31, 2023 -

So I have a program that calculates compound interest, and now I need to add a question at the end of my program that asks the user if they would like to run the program again, if they answer with Y or y the program will restart to the beginning, if they answer “N” or “n” the program is over. And if they answer with anything other than y or n it should repeat the question until the user finally enters y or n

What I have so far:

I have my entire program in a while loop and was able to get it to reset while Var == Y or y. But I can’t get it to repeat the question if the user answers with let’s say “q” or “618” or “L”. Does anyone know how to do something like this, please let me know… thank you

You can stay in the loop until they provide the answer you want and then break when they do. while True: answer = input('y or n: ').lower() if answer in ['y','n']: break

Take this function for example: def ask_yes_or_no(msg: str) -> bool: while True: if (user := input(msg).lower()) in ('y', 'yes'): return True if user in ('n' ,'no'): return False print('Invalid input. Please try again...') if ask_yes_or_no('Would you like to try again? [Y/N]: '): # Do something if True ... It takes one parameter which is used for input function to display your message and returns boolean based on the input. If invalid input is received, the user will have to re-enter the input. You can use this example to suit your specific case.

reddit.com › r/learnpython › can someone explain what this `while true` function is actually checking?

r/learnpython on Reddit: Can someone explain what this `while True` function is actually checking?

December 13, 2023 -

https://pastebin.com/NWkKQc1P

It's from Automate the Boring Stuff. I tried running it through the python tutor and it didn't clarify. Is the basic point that there actually isn't anything it's checking to be True, so it's an infinite loop until you trigger the `break`?

PS I figure this is something simple from much earlier that I didn't internalize. I plan to go through all the basic curriculum again to make sure there aren't any gaps in super basic knowledge.

A while loop runs while a condition is true. True is always true, so it will run until something causes it to break (e.g. a break statement, program crash, etc.) For comparison, the first loop in the code you posted could be rewritten without an infinite loop as: age = input("Enter your age: ") while not age.isdecimal(): age = input("Please enter a number for your age: ")

Correct; this is just a way to start an infinite loop that you intend to break with some condition/break statement later on. Mostly used for starting/running an application that you don't want to close down without user intent (clicking an exit/quit button in a UI or entering "quit", "exit", etc from the command line. It *isn't* a great construct to use when you want something that has solidly defined criteria to repeat until those criteria are met. As mopslik pointed out, you would be better served in those examples to actually use the defined criteria in those as your loop conditions since you're not at risk of just sticking the user in an infinite loop if you forget to write your break statement somewhere. You, also, don't have to write so many lines to accomplish the same goal. ``` password = "" while not password.isalnum(): password = input('Select a new password (alphanumeric only') print("Password is good") ``` You do not have to print a line and then call input(), either. Just put the message you want displayed into the parens for the function call: input("Enter your age: ")

askpython.com › home › python while loop

Python while Loop - AskPython

February 16, 2023 - We can implement this feature using “while True” block and break statement. Here is an example of a utility script that takes the user input (integer) and prints its square value.

coursera.org › tutorials › python-while-loop

How to Write and Use Python While Loops | Coursera

If the user enters a valid number, the program should print a message indicating that the number is valid and exit the loop. Use a continue statement to skip over any input that is not a valid number between 1 and 10.

ahmedgouda.hashnode.dev › user-input-and-while-loops-in-python

User Input and While Loops in Python

May 8, 2022 - We can stop the while loop in this program by calling break as soon as the user enters the 'quit' value: prompt = "\nPlease enter the name of a city you have visited:" prompt += "\n(Enter 'quit' when you are finished.) " while True: city = input(prompt) if city == 'quit': break else: print(f"I'd love to go to {city.title()}!")

geohey.gishub.org › python › 07_user_input_while_loops

07 user input while loops - geohey

We can stop the while loop in this program by calling break as soon as the user enters the 'quit' value: ... prompt = "\nPlease enter the name of a city you have visited:" prompt += "\n(Enter 'quit' when you are finished.) " # while True: # city = input(prompt) # if city == 'quit': # break # else: # print(f"I'd love to go to {city.title()}!")

wiki.python.org › moin › WhileLoop

While loops - Python Wiki

As the for loop in Python is so powerful, while is rarely used, except in cases where a user's input is required*, for example: n = raw_input("Please enter 'hello':") while n.strip() != 'hello': n = raw_input("Please enter 'hello':") However, the problem with the above code is that it's wasteful. In fact, what you will see a lot of in Python is the following: while True: n = raw_input("Please enter 'hello':") if n.strip() == 'hello': break

reddit.com › r/learnpython › is using while true loops good?

r/learnpython on Reddit: Is using while True loops good?

December 3, 2022 -

I remember seeing a video where the programmer said that using while True loops aren't good.

Can someone give an example of where this might be the case?

What would be better to use? especially, if I am trying to check for user input.

E.g. They have entered a username that is not in the list of usernames.

Having a proper end condition for the while loop makes it more readable, and easier to understand.

It really depends on what you're trying to do with the loop. If there's a sensical condition, use the loop condition to end the loop. Don't force using a condition though just for the sake of using one. You may end up managing flags or something similar which is often not as readable as a conditional break in the loop. Also, afaik, Python doesn't have a do...while loops because a while True with a break at the end is close enough that implementing a separate construct wasn't worth it. Edit: Actually, this is what I was thinking of. Łukasz Langa is involved in the language , created Black, and GvR appears to be in agreeance with what he said in that post. As is typically the case, do whichever reads better for the particular scenario.

sqlpad.io › tutorial › python-while-loop

Python while loop - Python while loops, a key concept in programming. Learn how looping enables repeated code execution, a crucial tool for efficient and effective programming solutions - SQLPad.io

We can use a while loop that will continue to prompt the user for their age until they enter a valid number. while True: try: age = int(input("Please enter your age: ")) if age < 0: print("Age cannot be negative.