The Model B+ has Revision (int) 16 : '0x10'

# ------------- getRevision of Rasperry Board -------------
def getRevision():
  # Extract board revision from cpuinfo file
  # 16 = B+
  myrevision = 0
  try:
    f = open('/proc/cpuinfo','r')
    for line in f:
      if line[0:8]=='Revision':
        length=len(line)
        myrevision = str(int(line[11:length-1], 16))
    f.close()
  except:
    myrevision = 0
  return myrevision

def getrevision():
  rev =  ([l[11:-1] for l in 
    open('/proc/cpuinfo','r').readlines() if l[:8]=="Revision"]+['0000'])[0]
  return (int(rev,16))