I have a quite simple problem.
I want to get some console input from a user (without an enter press at the end) and do something with it right away.
I quickly saw that the input() function from python would not work. I thought maybe you could write something like this:
sys.stdout.write("Input: ")
while True:
line = sys.stout.readline()
// Do something with the lines
But unfortunately it does not work because stdout is not readable. With stdin it does not work either because it waits for a enter press of the user.
Is it somehow possible to get lines without the user submit it?
You can get input from console interactively in byte format instead of getting a string with input command.
import sys
while True:
c = sys.stdin.read(1) # Read one byte
Here is what you might be looking for.
To get this working you will need to use pip install keyboard in the command line first.
import keyboard
while True:
key_pressed = keyboard.read_key()
print(f'You pressed {key_pressed}.')
I am writing Python menu programs, and are capturing key strikes (no ) and that's working OK. The problem is when I exit the program using sys.exit() the last keystrike ends up on the command line.
I'm using the 'keyboard' module which required pip install, but I'm open to suggestion on other ways to capture the key strike. I've tried using msvcrt.getch(), sys.stdout.flush(), sys.stdin.flush() before exiting, to no avail. In the code below, the character echoed to the command line is not necessarily upper case, depending on the caps lock.
Thanks in advance. This has to be a common problem, but I've spent a lot of time searching and so far nothing that works.
import keyboard
import sys
key = keyboard.read_key()
key = key.upper()
print('Key pressed: '+key)
sys.exit() # leaves residual character on the command line
In the command line when up and down arrow is pressed it shows the last command in the same line. I want to implement that functionality in my program. What I have done is store previous command in a list. I can iterate it from the end and print it out but I can only print out in a new line. What is that functionality called and how to implement it?
It's called "history". It is implemented in readline, and is automatically enabled for input() and raw_input() when the module is imported; only loading and saving the history needs to be handled by the implementor.
I want to display a long list interactively in a python command line program.
Basically, think git log, with the scrolling and the q to quit.
How would I do this in python?
The interactive view that git has is called a pager. Git just uses the pager less, or a different one if you configure it.
Basically you need to run less in a subprocess and pipe your output to it.
There are more details on how to do that in this question: Paging output from python
There is also a python helper library: https://pypi.python.org/pypi/pager (I've not used it)
Create a while loop and ask inputs from the prompt.
Eg:
import msvcrt
my_lis = range(1,78)
limit = 25
my_inp = None
while my_lis:
if my_inp != 'q':
print my_lis[:limit]
my_lis = my_lis[limit:]
else:
break
print "Press any key to continue or (q) to Quit :"
my_inp = msvcrt.getch()
# Exit
So, as the title says, I want a proper code to close my python script.
So far, I've used input('Press Any Key To Exit'), but what that does, is generate a error.
I would like a code that just closes your script without using a error.
Does anyone have a idea? Google gives me the input option, but I don't want that
It closes using this error:
Traceback (most recent call last):
File "C:/Python27/test", line 1, in <module>
input('Press Any Key To Exit')
File "<string>", line 0
^
SyntaxError: unexpected EOF while parsing
If you are on windows then the cmd pause command should work, although it reads 'press any key to continue'
import os
os.system('pause')
The linux alternative is read, a good description can be found here
This syntax error is caused by using input on Python 2, which will try to eval whatever is typed in at the terminal prompt. If you've pressed enter then Python will essentially try to eval an empty string, eval(""), which causes a SyntaxError instead of the usual NameError.
If you're happy for "any" key to be the enter key, then you can simply swap it out for raw_input instead:
raw_input("Press Enter to continue")
Note that on Python 3 raw_input was renamed to input.
For users finding this question in search, who really want to be able to press any key to exit a prompt and not be restricted to using enter, you may consider to use a 3rd-party library for a cross-platform solution. I recommend the helper library readchar which can be installed with pip install readchar. It works on Linux, macOS, and Windows and on either Python 2 or Python 3.
import readchar
print("Press Any Key To Exit")
k = readchar.readchar()
msvrct - built-in Python module solution (windows)
I would discourage platform specific functions in Python if you can avoid them, but you could use the built-in msvcrt module.
>>> from msvcrt import getch
>>>
>>>
... print("Press any key to continue...")
... _ = getch()
... exit()
A little late to the game, but I wrote a library a couple years ago to do exactly this. It exposes both a pause() function with a customizable message and the more general, cross-platform getch() function inspired by this answer.
Install with pip install py-getch, and use it like this:
from getch import pause
pause()
This prints 'Press any key to continue . . .' by default. Provide a custom message with:
pause('Press Any Key To Exit.')
For convenience, it also comes with a variant that calls sys.exit(status) in a single step:
pause_exit(0, 'Press Any Key To Exit.')
Check it out.
a = input('Press a key to exit')
if a:
exit(0)
Here's a way to end by pressing any key on *nix, without displaying the key and without pressing return. (Credit for the general method goes to Python read a single character from the user.) From poking around SO, it seems like you could use the msvcrt module to duplicate this functionality on Windows, but I don't have it installed anywhere to test. Over-commented to explain what's going on...
import sys, termios, tty
stdinFileDesc = sys.stdin.fileno() #store stdin's file descriptor
oldStdinTtyAttr = termios.tcgetattr(stdinFileDesc) #save stdin's tty attributes so I can reset it later
try:
print 'Press any key to exit...'
tty.setraw(stdinFileDesc) #set the input mode of stdin so that it gets added to char by char rather than line by line
sys.stdin.read(1) #read 1 byte from stdin (indicating that a key has been pressed)
finally:
termios.tcsetattr(stdinFileDesc, termios.TCSADRAIN, oldStdinTtyAttr) #reset stdin to its normal behavior
print 'Goodbye!'
Ok I am on Linux Mint 17.1 "Rebecca" and I seem to have figured it out, As you may know Linux Mint comes with Python installed, you cannot update it nor can you install another version on top of it. I've found out that the python that comes preinstalled in Linux Mint is version 2.7.6, so the following will for sure work on version 2.7.6. If you add raw_input('Press any key to exit') it will not display any error codes but it will tell you that the program exited with code 0. For example this is my first program. MyFirstProgram. Keep in mind it is my first program and I know that it sucks but it is a good example of how to use "Press any key to Exit"
BTW This is also my first post on this website so sorry if I formatted it wrong.
in Windows:
if msvcrt.kbhit():
if msvcrt.getch() == b'q':
exit()
In python 3:
while True:
#runtime..
answer = input("ENTER something to quit: ")
if answer:
break
You can use this code:
from os import system as console
console("#echo off&cls")
#Your main code code
print("Press Any Key To Exit")
console("pause>NUL&exit")