Is there a method that tells my program to quit

Question

For the  q   quit  option in my program menu  I have the following code   elif choice     q       print     That worked all right until I put it in an infinite loop  which kept printing blank lines  Is there a method that can quit the program  Else  can you think of another solution

User · Answer

Please note that the solutions based on sys.exit() or any Exception may not work in a multi-threaded environment.

Since exit() ultimately “only” raises an exception, it will only exit the process when called from the main thread, and the exception is not intercepted. (doc)

This answer from Alex Martelli for more details.

User · Answer

In Python 3 there is an exit   function   elif choice     q       exit

User · Answer

One way is to do   sys exit 0    You will have to import sys of course   Another way is to break out of your infinite loop  For example  you could do this   while True      choice   get input       if choice     a             do something     elif choice     q           break   Yet another way is to put your main loop in a function  and use return   def run        while True          choice   get input           if choice     a                 do something         elif choice     q               return  if   name         main         run     The only reason you need the run   function when using return is that  unlike some other languages  you can t directly return from the main part of your Python code  the part that s not inside a function

User · Answer

See sys exit  That function will quit your program with the given exit status

User · Answer

The actual way to end a program  is to call  raise SystemExit   It s what sys exit does  anyway   A plain SystemExit  or with None as a single argument  sets the process  exit code to zero  Any non-integer exception value  raise SystemExit  some message    prints the exception value to sys stderr and sets the exit code to 1  An integer value sets the process  exit code to the value     python -c  raise SystemExit 4    echo    4

[python] Is there a method that tells my program to quit?

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