Exercise submission is very pedantic about indentation

[David Coles]

In worksheets, any whitespace after code can trigger an IndentationError during submit that will not cause an issue when the code run in the console (making it hard to work out why it happens).

For example (using underscores to make spaces more clear):

def x()
____return 3
print x()
____

[David Coles (dcoles)]

Calling str.strip may be enough to solve this issue.

[David Coles (dcoles)]

This would be a good one for 1.0.2 this it causes a lot of hassle for students.

[Matt Giuca (mgiuca)]

Don't call str.strip -- call rstrip. strip could remove spaces from the front, which could mean wrecking indentation (if the file begins with indents for some reason -- e.g., this should be valid:
____print 4
____print 7
but it would be stripped to:
print 4
____print 7
which is invalid
).

rstrip should be valid, as it would fix the above example.