(no subject)

[Alan Gage]

Hello, I recently noticed a bug involving GitBash and Python. I was
running a function that would post the system time once every second
using a while loop but the text was only sent after the while loop
ended due to a timer I had set. Essesntially, instead of it being
entered every second into the terminal, it was entered all at once,
when the loop ended. I tried this with the Command Line, among other
things, and it worked as intended, with the text being entered every
second. This is on Windows 10 Pro with the Fall Creators Update and
the most recent version of GitBash.

Re:

[René Scharfe]

Am 27.02.2018 um 02:18 schrieb Alan Gage:
> Hello, I recently noticed a bug involving GitBash and Python. I was
> running a function that would post the system time once every second
> using a while loop but the text was only sent after the while loop
> ended due to a timer I had set. Essesntially, instead of it being
> entered every second into the terminal, it was entered all at once,
> when the loop ended. I tried this with the Command Line, among other
> things, and it worked as intended, with the text being entered every
> second. This is on Windows 10 Pro with the Fall Creators Update and
> the most recent version of GitBash.

Python buffers its output by default.  On terminals it enables line
buffering, i.e. the accumulated output is flushed when a newline
character is reached.  Otherwise it uses a system-dependent buffer
size in the range of a few kilobytes.  You can check if your output
is a terminal e.g. with:

  python -c "import sys; print(sys.stdout.isatty())"

You can disable buffering by running your script with "python -u".
This discussion mentions more options:

  https://stackoverflow.com/questions/107705/disable-output-buffering

You can also start bash on the command line.  I do wonder why Git CMD
seems to be started in what passes as a terminal, while Git BASH is
not, though.

You may want to check out https://gitforwindows.org/ and report your
findings using their issue tracker.

(This mailing list here, git@vger.kernel.org, is mostly used for
discussing Git itself, not so much about extra tools like bash or
Python that are packaged with Git for Windows.)

René