def strim(str): s = 0

sLen = len(str)
e = sLen
for s1 in str:
    if s1 != " ":
        break
    s = s + 1

while e > s:
    if str[ e -1 ] != " ":
        break;
    e = e - 1
print("trim s=%d e=%d" %(s,e))
return str[s:e]