python3 如果没有用户输入更新变量，我如何继续循环？

Question

I would like a while loop to continue and only read the updated variable 'if' user adds one.

value = 2
print("Enter new/updated value: ")
while True:
   if():
      value = input()
   print(value)

output should be:

Enter new/updated value: 
2
2
2
2...

until I enter a new value '3' into the keyboard and then press enter (does not stop)

3
3
3
3...

or if I press 4 'and then enter' on the keyboards, I should get

4
4
4
4...

How update a variable similar to a chat session? Waiting for user input but without stopping the loop.

all I get are 2's and an updated value is never accepted.

Answer 1

you can add a string in input() function to write a message. A break statment allow us exit from a loop and you need to validate your input before Try this code:D

value = 2
while True:
  value = input("Enter new/updated value: ")
  if(value == 3):
    break;    
  else :
    print(value)

Answer 2

It seems you are looking for something like multi-threading and event listeners , which is not as easy or beginner-friendly as you might expect... I think you should check out tutorials with those key words - or question if you really need functionality like that right now.