Grab a line's whitespace/indention with Python

Question

Basically, if I have a line of text which starts with indention, what\'s the best way to grab that indention and put it into a variable in Python? For example, if the line i

Answer 1

def whites(a):
return a[0:a.find(a.strip())]

Basically, the my idea is:

1. Find a strip of starting line
2. Find a difference between starting line and stripped one