CODEWITHSUNDEEP
python
Ahmad Siavosh
Ahmad Siavosh

Reputation: 676

Retrieving the last printed character on console

I'd like to get the last character written on the console in python. For example I may have several threads which write on the console then in each of the threads I need to know the last character that has been written to the console by other threads. Is there any way?

e.g: >> print 'Hello' the last character is '\n' in this case or

Thread A:
>>> print 'Hello'
Thread B:
>>> print 'Bye'
Thread C:
>>> What is the last written character?

And it's obvious we can't determine the answer in thread C unless we ask the Console in some way.

Upvotes: 0

Views: 6036

Answers (2)

Reut Sharabani
Reut Sharabani

Reputation: 31339

Depends on where you're writing to. If you're writing to standard output sys.stdout (the usual case) - it's not open for reading. So technically no. What you could do is use a pipe the output to someone else and grab it after stdout already flushed it.

This is an example under Ubuntu OS, but there are probably equivalents in any OS:

And example script (p.py):

print "hello"

Take the first of last two characters to skip newline (\n) from print:

reut@sharabani:~$ python p.py | tail -c2 | head -c1
o

Edit:

If you do not have access to head and tail it should be simple to do this in python:

write the script take_last_char.py:

import sys
# read whatever output the previous script piped here
# but only keep the last line (stripping the newline...)
for line in sys.stdin:
    tmp = line.strip()

print tmp[-1]

And now simply use:

python p.py | python take_last_char.py

Upvotes: 3

GLHF
GLHF

Reputation: 4035

Unless you change end parameter of print function in your program, it'll be always \n.

Upvotes: 0

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