Correct way to pause a Python program

Question

I ve been using the input function as a way to pause my scripts  print  quot something quot   wait   input  quot Press Enter to continue  quot   print  quot something quot    Is there a formal way to do this

User · Answer

I have had a similar question and I was using signal:

import signal

def signal_handler(signal_number, frame):
    print "Proceed ..."

signal.signal(signal.SIGINT, signal_handler)
signal.pause()

So you register a handler for the signal SIGINT and pause waiting for any signal. Now from outside your program (e.g. in bash), you can run kill -2 <python_pid>, which will send signal 2 (i.e. SIGINT) to your python program. Your program will call your registered handler and proceed running.

User · Answer

cross-platform way  works everywhere import os  sys  if sys platform     win32       os system  pause   else      input  Press any key to continue

User · Answer

I assume you want to pause without input  Use  time sleep seconds

User · Answer

For Windows only  use  import os os system  quot pause quot

User · Answer

For cross Python 2 3 compatibility  you can use input via the six library   import six six moves input   Press the  lt ENTER gt  key to continue

User · Answer

Print   This is how you pause    input

User · Answer

I use the following for Python  2 and Python  3 to pause code execution until user presses Enter import six  if six PY2      raw input  quot Press the  lt Enter gt  key to continue    quot   else      input  quot Press the  lt Enter gt  key to continue    quot

User · Answer

I work with non-programmers who like a simple solution  import code code interact banner  Paused  Press  D  Ctrl D  to continue    local globals      This produces an interpreter that acts almost exactly like the real interpreter  including the current context  with only the output  Paused  Press  D  Ctrl D  to continue      The Python Debugger is also a good way to pause  import pdb pdb set trace     Python 2  or breakpoint     Python 3

User · Answer

It Seems fine to me  or raw input   in Python 2 X   Alternatively  you could use time sleep   if you want to pause for a certain number of seconds  import time print  quot something quot   time sleep 5 5       Pause 5 5 seconds print  quot something quot

User · Answer

Very simple   raw input  Press Enter to continue       exit

User · Answer

So  I found this to work very well in my coding endeavors  I simply created a function at the very beginning of my program    def pause        programPause   raw input  Press the  lt ENTER gt  key to continue        and now I can use the pause   function whenever I need to just as if I was writing a batch file  For example  in a program such as this   import os import system  def pause        programPause   raw input  Press the  lt ENTER gt  key to continue       print  Think about what you ate for dinner last night      pause     Now obviously this program has no objective and is just for example purposes  but you can understand precisely what I mean   NOTE  For Python 3  you will need to use input as opposed to raw input

User · Answer

I think I like this solution  import getpass getpass getpass  quot Press Enter to Continue quot    It hides whatever the user types in  which helps clarify that input is not used here  But be mindful on the OS  X platform  It displays a key which may be confusing    Probably the best solution would be to do something similar to the getpass module yourself  without making a read -s call  Maybe making the foreground color match the background

User · Answer

In Linux  you can issue kill -TSTP  lt pid gt  to the background and stop a process  So  it s there  but not consuming CPU time  Then later  kill -CONT  lt pid gt  and it s off and running again

User · Answer

By this method  you can resume your program just by pressing any specified key you ve specified that  import keyboard while True      key   keyboard read key       if key     space      You can put any key you like instead of  space          break  The same method  but in another way  import keyboard while True      if keyboard is pressed  space       The same  you can put any key you like instead of  space          break  Note  you can install the keyboard module simply by writing this in you shell or cmd  pip install keyboard

User · Answer

I think that the best way to stop the execution is the time sleep   function  If you need to suspend the execution only in certain cases you can simply implement an if statement like this  if somethinghappen      time sleep seconds   You can leave the else branch empty

User · Answer

As pointed out by mhawke and steveha s comments  the best answer to this exact question would be      For a long block of text  it is best to use input  Press  lt ENTER gt  to continue    or raw input  Press  lt ENTER gt  to continue   on   Python 2 x  to prompt the user  rather than a time delay  Fast readers   won t want to wait for a delay  slow readers might want more time on   the delay  someone might be interrupted while reading it and want a   lot more time  etc  Also  if someone uses the program a lot  he she   may become used to how it works and not need to even read the long   text  It s just friendlier to let the user control how long the block   of text is displayed for reading

[python] Correct way to pause a Python program

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