s1 = " fdsf dsffsdf "
print s1.lstrip() #去掉左边的空格
s2 = " edsfsdf dsf "
print s2.rstrip() #去掉右边的空格
s3 = " dsfdsaf sdfd sdsf "
print s1.lstrip() #去掉左边的空格
s2 = " edsfsdf dsf "
print s2.rstrip() #去掉右边的空格
s3 = " dsfdsaf sdfd sdsf "
print s3.strip() #去掉两边的空格
s4 = " dsfdsaf sdfd sdsf "
print s4.replace(' ', '') #去掉所有的空格
s5 = " fdsfdsf dfsf sfds we fwef "
s5 = ''.join(s5.split()) #去掉所有的空格
print s5
结果：
fdsf dsffsdf
edsfsdf dsf
dsfdsaf sdfd sdsf
dsfdsafsdfdsdsf
fdsfdsfdfsfsfdswefwef