Exiting from python Command Line

Question

To exit from Python command line  I have to type exit    If I type exit  it says   Use exit   or Ctrl-Z plus Return to exit   Usually when you type exit  you would want to exit the program  Why does the interpreter give me the above error when it knows I am trying to exit the command line  Why doesn t it just exit  I know it doesn t matter and its a silly question but I am curious

User · Answer

With Anaconda 4 5  and Python 3 6  on Windows use  Ctrl Z   or  exit     In some cases  you might have to use  Ctrl Break   If your computer doesn t have Break key then see here

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If you stuck in python command line and none of above solutions worked for you  try exit 2

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This works for me  best way to come out of python prompt      exit

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Because the interpreter is not a shell where you provide commands  it s - well - an interpreter  The things that you give to it are Python code   The syntax of Python is such that exit  by itself  cannot possibly be anything other than a name for an object  Simply referring to an object can t actually do anything  except what the read-eval-print loop normally does  i e  display a string representation of the object

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When you type exit in the command line  it finds the variable with that name and calls   repr    or   str    on it  Usually  you d get a result like    lt function exit at 0x00B97FB0 gt    But they decided to redefine that function for the exit object to display a helpful message instead  Whether or not that s a stupid behavior or not  is a subjective question  but one possible reason why it doesn t  just exit  is   Suppose you re looking at some code in a debugger  for instance  and one of the objects references the exit function  When the debugger tries to call   repr   on that object to display that function to you  the program suddenly stops  That would be really unexpected  and the measures to counter that might complicate things further  for instance  even if you limit that behavior to the command line  what if you try to print some object that have exit as an attribute

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To exit from Python terminal  simply just do   exit     Please pay attention it s a function which called as most user mix it with exit without calling  but new Pyhton terminal show a message     or as a shortcut  press   Ctrl   D   on your keyboard

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You can fix that   Link PYTHONSTARTUP to a python file with the following     Make exit work as expected type exit    repr     type exit    call       How does this work   The python command line is a read-evaluate-print-loop  that is when you type text it will read that text  evaluate it  and eventually print the result    When you type exit   it evaluates to a callable object of type site Quitter and calls its   call   function which exits the system  When you type exit it evaluates to the same callable object  without calling it the object is printed which in turn calls   repr   on the object     We can take advantage of this by linking   repr   to   call   and thus get the expected behavior of exiting the system even when we type exit without parentheses

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In my python interpreter exit is actually a string and not a function --  Use Ctrl-D  i e  EOF  to exit    You can check on your interpreter by entering type exit   In active python what is happening is that exit is a function  If you do not call the function it will print out the string representation of the object  This is the default behaviour for any object returned  It s just that the designers thought people might try to type exit to exit the interpreter  so they made the string representation of the exit function a helpful message  You can check this behaviour by typing str exit  or even print exit

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I recommend you exit the Python interpreter with Ctrl-D   This is the old ASCII code for end-of-file or end-of-transmission

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exit  is a valid variable name that can be used in your Python program  You wouldn t want to exit the interpreter when you re just trying to see the value of that variable

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This message is the   str   attribute of exit  look at these examples    1   gt  gt  gt  print exit Use exit   or Ctrl-D  i e  EOF  to exit   2   gt  gt  gt  exit   str      Use exit   or Ctrl-D  i e  EOF  to exit    3   gt  gt  gt  getattr exit     str        Use exit   or Ctrl-D  i e  EOF  to exit

[python] Exiting from python Command Line

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