Python process communication

pcomm.py

def ReadSVNLog(BaseRev,rev,variant):
    FoundRev = ""
    p = subprocess.Popen("svn log --stop-on-copy -r HEAD:{} --search r{} https://mysvn/{}".format(BaseRev,rev,variant) , stdout=subprocess.PIPE, shell=True)
    for stdout_line in p.stdout: #Loop on lines printed to stdout
        tmp = re.findall(r'r\d+\s|',str(stdout_line.decode('utf-8')))[0] #This is to match rXXXXX in commit msg header
        if len(tmp) > 1: #at least rXXXXX
            FoundRev = tmp.replace('r','').rstrip()
            print("Debug {}".format(FoundRev))
        if rev in str(stdout_line):
            p.stdout.close()
            p.kill()
            return FoundRev
    return None