一、去除空格

　　strip()

"   xyz   ".strip()            # returns "xyz"  
"   xyz   ".lstrip()           # returns "xyz   "  
"   xyz   ".rstrip()           # returns "   xyz"  
"  x y z  ".replace(' ', '')   # returns "xyz" 

二、替换 replace("space","")

　　用replace("\n", ""),后边的串替换掉前边的