What is the best way to exit a function which has no return value in python before the function ends e g a check fails

Question

Let s assume an iteration in which we call a function without a return value  The way I think my program should behave is explained in this pseudocode   for element in some list      foo element   def foo element       do something     if check is true          do more  because check was succesful      else          return None     do much much more      If I implement this in python  it bothers me  that the function returns a None  Is there a better way for  exiting a function  that has no return value  if a check fails in the body of the function

User · Answer

you can use the return statement without any parameter to exit a function  def foo element       do something     if check is true          do more  because check was succesful      else          return     do much much more      or raise an exception if you want to be informed of the problem  def foo element       do something     if check is true          do more  because check was succesful      else          raise Exception  cause of the problem       do much much more

User · Answer

You could simply use  return   which does exactly the same as  return None   Your function will also return None if execution reaches the end of the function body without hitting a return statement   Returning nothing is the same as returning None in Python

User · Answer

I would suggest   def foo element       do something     if not check  return     do more  because check was succesful      do much much more

User · Answer

return None or return can be used to exit out of a function or program  both does the same thing quit   function can be used  although use of this function is discouraged for making real world applications and should be used only in interpreter       import site          def func            print  quot Hi quot           quit           print  quot Bye quot     exit   function can be used  similar to quit   but the use is discouraged for making real world applications   import site          def func            print  quot Hi quot           exit           print  quot Bye quot     sys exit  arg   function can be used and need to import sys module for that  this function can be used for real world applications unlike the other two functions   import sys    height   150    if height  lt  165    in cm               exits the program      sys exit  quot Height less than 165 quot        else       print  quot You ride the rollercoaster  quot      os  exit n  function can be used to exit from a process  and need to import os module for that

[python] What is the best way to exit a function (which has no return value) in python before the function ends (e.g. a check fails)?

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