String operations

Terry Hancock hancock at anansispaceworks.com
Sat Dec 11 07:52:34 CET 2004


On Wednesday 01 December 2004 04:20 pm, Anoop Rajendra wrote:
> os.execvp("condor_q",["condor_q","-l","-constraint",'"ProjectId==\\\"anoopr_samadams.fnal.gov_161903_30209\\\""'])
> 
> doesnt work. Its definately a problem with one of the million
> backslashes and quotes present, but I'm not able to figure it out.
> What am I doing wrong?

Honestly, I'm not sure, but try the following:

1) Paste the questionable string onto a print statement (in the
  interactive interpreter), and get python to tell you what it made
  of what you wrote:

  print '"ProjectId==\\\"anoopr_samadams.fnal.gov_161903_30209\\\""'

2) Try using a "raw string", which won't try to interpret the backslashes:

  r'''"ProjectId==\"anoopr_samadams.fnal.gov_161903_30209\""'''

3) Use triple-quotes (as I did above) instead of escaping your quotation
   marks: in Python you can actually quote with 'a', "a", '''a''', or """a""". The
   triple quotes interpret newlines literally, but they also interpret both
   single and double quotation marks as literal characters, which can be
   convenient.

That should get you there with a little tinkering.

Cheers,
Terry


--
Terry Hancock ( hancock at anansispaceworks.com )
Anansi Spaceworks  http://www.anansispaceworks.com




More information about the Python-list mailing list