Very odd output from subprocess

[Nobody]

On Wed, 30 Jun 2010 21:12:12 -0700, m wrote:

> If I add the line:
>      for l in line: print ord(l),'\t',l
> after the first readline, I get the following:
> 
> 
> 27 	
> 91 	[
> 48 	0
> 48 	0
> 109 	m
> 27 	
> 91 	[
> 51 	3
> 55 	7
> 109 	m
> 
> before the codes begin for the string as it appears if I just print
> it.  So, what is this sequence?  They seem like some sort of escape
> codes, I've never seen this before at all.

<ESC>[00m is the ANSI code to reset attributes to their default state.
<ESC>[37m is the ANSI code to set the foreground color to white.

> Can anyone enlighten me as to what is going on?
> 
> And, can I safely strip sets of 5 characters from the front as long as
> they start with Escape (27)?

No, escape sequences can be of arbitrary length.

The first thing to try is:

	del os.environ['TERM']

Any correctly-written program uses the value of the TERM environment
variable to select escape codes which are appropriate for the terminal
being used.

Unfortunately, there are many incorrectly written programs which assume
that all terminals support certain escape sequences.

The fact that the program is using escape sequences even when
stdout/stderr isn't a tty indicates that it isn't correctly written, so
it far from certain that clearing TERM will work.