How to finish sys.stdin.readlines() input?
Question:
This might be a silly question, but as I can’t find an answer, I have to ask it.
In interactive python I want to process a message which i get with:
>>> message = sys.stdin.readlines()
Everything works fine, but… how to stop it from getting an input and make it save into message variable? Stopping with ctrl+c stops whole process so there is no input to be saved anywhere. I guess there’s an easy answer I just can’t find…
Answers:
Use CTRL-D.
message = sys.stdin.readlines()
abc
def
<CTRL-D>
# message == ['abcn', 'defn']
For unix based system :
Hello, you can tape : Ctrld
Ctrld closes the standard input (stdin) by sending EOF.
Example :
>>> import sys
>>> message = sys.stdin.readlines()
Hello
World
My
Name
Is
James
Bond
# <ctrl-d> EOF sent
>>> print message
['Hellon', 'Worldn', 'Myn', 'Namen', 'Isn', 'Jamesn', 'Bondn']
For Windows :
To send EOF on Windows, you can replace Ctrld by Ctrlz
This is an old question but it needs an update about Windows and different keyboard layouts.
If neither CTRL + Z nor CTRL + D ** work for you on Windows and and you’re wandering what is going on do this:
- check if you are using default english keyboard layout
- if you do have different, non-default keyboard layout try switching keyboard setting to English in language bar, then try pressing ctrl + z after changes
- if you’re still confused look at the screen, what appears in command line when you press ctrl + z. What symbol do you see? When I was pressing ctrl + z I was seeing this: ^Y, and when by mistake I pressed ctrl + y I’ve seen this ^Z, i pressed enter and the input was taken, EOF sent.
This is somewhat strange and counterintuitive. I changed keys layout some time ago to include polish characters, but all the common keys are left unchanged, z still maps to z when I use the keyboard normally, normally ctrl + z does nothing in my keyboard, so I shouldn’t be changed. But apparently in cmd it works differently, in order to have default link between ctrl and z I have to switch to default layout, or use control y to sent EOF.
On windows simply do CTRL+Z and press enter
If you are a Mac user, please use command + D. It works!
I tested that in VS code terminal.
After using this command:
for line in stdin:
I input many lines of data. Keep pressing Enter does not work now.
Solution:
Press Ctrl + Z, you will see ^Z in the terminal.
Then you have to press Enter to finish.
This might be a silly question, but as I can’t find an answer, I have to ask it.
In interactive python I want to process a message which i get with:
>>> message = sys.stdin.readlines()
Everything works fine, but… how to stop it from getting an input and make it save into message variable? Stopping with ctrl+c stops whole process so there is no input to be saved anywhere. I guess there’s an easy answer I just can’t find…
Use CTRL-D.
message = sys.stdin.readlines()
abc
def
<CTRL-D>
# message == ['abcn', 'defn']
For unix based system :
Hello, you can tape : Ctrld
Ctrld closes the standard input (stdin) by sending EOF.
Example :
>>> import sys
>>> message = sys.stdin.readlines()
Hello
World
My
Name
Is
James
Bond
# <ctrl-d> EOF sent
>>> print message
['Hellon', 'Worldn', 'Myn', 'Namen', 'Isn', 'Jamesn', 'Bondn']
For Windows :
To send EOF on Windows, you can replace Ctrld by Ctrlz
This is an old question but it needs an update about Windows and different keyboard layouts.
If neither CTRL + Z nor CTRL + D ** work for you on Windows and and you’re wandering what is going on do this:
- check if you are using default english keyboard layout
- if you do have different, non-default keyboard layout try switching keyboard setting to English in language bar, then try pressing ctrl + z after changes
- if you’re still confused look at the screen, what appears in command line when you press ctrl + z. What symbol do you see? When I was pressing ctrl + z I was seeing this: ^Y, and when by mistake I pressed ctrl + y I’ve seen this ^Z, i pressed enter and the input was taken, EOF sent.
This is somewhat strange and counterintuitive. I changed keys layout some time ago to include polish characters, but all the common keys are left unchanged, z still maps to z when I use the keyboard normally, normally ctrl + z does nothing in my keyboard, so I shouldn’t be changed. But apparently in cmd it works differently, in order to have default link between ctrl and z I have to switch to default layout, or use control y to sent EOF.
On windows simply do CTRL+Z and press enter
If you are a Mac user, please use command + D. It works!
I tested that in VS code terminal.
After using this command:
for line in stdin:
I input many lines of data. Keep pressing Enter does not work now.
Solution:
Press Ctrl + Z, you will see ^Z in the terminal.
Then you have to press Enter to finish.