import subprocess

#returncode = subprocess.call('svn checkout -r "{2011-9-25 10:00:00}"  svn+ssh://markus@markus002.student.cs.uwaterloo.ca/u/markus/markus_cs115_f/svn-repos-root/group_0001/l11 /u/cs115/u/yc2lee/l11_checkout', shell=True);

returncode = subprocess.call('svn checkout svn+ssh://markus@markus002.student.cs.uwaterloo.ca/u/markus/markus_cs115_f/svn-repos-root/group_0001/l11 /u/cs115/u/yc2lee/l11_checkout', shell=True);
print returncode;