"Jesse" <[EMAIL PROTECTED]> writes: > Hi all, I have a problem using wget and Popen. I hope someone can help. > > > -- Problem -- > I want to use the command: > wget -nv -O "dir/cpan.txt" "http://search.cpan.org"; > and capture all it's stdout+stderr. > (Note that option -O requires 'dir' to be existing before wget is executed) > > Popen doesn't work, while os.system and shell do. Popen will give the error: > dir/cpan.txt: No such file or directory > > While os.system and shell will give the correct result: > 06:52:40 URL:http://search.cpan.org/ [3657/3657] -> "dir1/cpan.txt" [1]
[...] > -- Python Code using Popen with cmd arg list -- > # imports > import os > from subprocess import Popen, PIPE > > # vars and create dir > cmd_set = ['wget', '-nv', '-O dir/cpan.txt', 'http://search.span.org'] > cmd = ' '.join(cmd_set) > print "cmd: " + cmd > try: > os.makedirs('dir') > except: > print 'dir already exists' > > > # execute using Popen (does NOT work) > proc = Popen(cmd_set, stdout=PIPE, stderr=PIPE) > return_code = proc.wait() > if return_code == 0: > print "Success:\n%s" % (proc.stdout.read() + proc.stderr.read()) > else: > print "Failure %s:\n%s" % (return_code, proc.stderr.read() + > proc.stdout.read()) > > > # execute using os.system (does work) > os.system(cmd) > > > -- Python code output of Popen -- > Failure 1: > dir/cpan.txt: No such file or directory > > > -- Question -- > Why is Popen unable to correctly execute the wget, while os.system can? I don't know exactly why in this case Popen doesn't work, but the counterpart of os.system is Popen with option shell=True and the first parameter should be a string instead of list. That seems to work: proc = Popen("wget -nv -O dir/cpan.txt http://search.span.org";, shell=True, stdout=PIPE, stderr=PIPE) and this variant seems to work too: cmd_set = ['wget', '-nv', '-O', 'dir/cpan.txt', 'http://search.span.org'] -- HTH, Rob -- http://mail.python.org/mailman/listinfo/python-list
