Python意外缩进，但缩进正确

Question

Below is my code, simple routine, cannot figure out what is wrong with the indent, but keeps getting complain right after the val=line.strip().split() no matter what I put there...

if line.startswith('U'):
    val = line.strip().split()
    print val

Answer 1

This line is indented by 4 spaces

val = line.strip().split()

This one is indented by a TAB

print val

In many editors (including SO) these appear to be indented the same. It's possible to mix tab and space indenting in Python, but a really really bad idea