On 04:11 am, tusklah...@gmail.com wrote:
Hello, I'm a newb and have been playing with Python trying to print a
changing value to the screen that updates as the value changes. I have
this
code, which is pretty much doing what I want:
#!/usr/bin/env python3
import time
text = input('Please enter something: ')
for c in text:
print('This is what you entered:', '{0}'.format(c), '\033[A')
if c == text[-1]:
print('\n')
time.sleep(1)
Which will output: "This is what you entered: <text>" with text
constantly
changing. It all stays on the same line, which is what I'm shooting
for. So
my question is, the little bit that allows me to do this, the '\033[A',
I
don't really know what that is. I was looking at other code while
trying to
figure this out, and '\033[A' was used to do this, but I don't really
know
what it is or where to find information on it. It's an escape code,
isn't
it? But is it in Python, in Bash, or what? Forgive me if my question is
hazy, I'm just not sure why adding '\033[A' got it working for me,
where
would I find the information that would have enabled me to know that
this is
what I needed to use?
Its a vt102 control sequence. It means "move the cursor up one row".
vt102 is something your terminal emulator implements (or, heck, maybe
you have a real physical vt102 terminal.... nah). To Python, it's just
a few more meaningless bytes.
You can read all about vt102 on vt100.net:
http://vt100.net/docs/vt102-ug/
Jean-Paul
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