Length of a path in a 2-tuple.

[PythonNerd]

Some homework that I have been struggling on mainly because I am unsure how to proceed. I have all the formulas I need but I haven't been able to find a useful online tutorial for how to get the necessary information out of a 2-tuple.

print (pathLength2d ([(0,0), (1,1)])) 

import math

def length (v):

    """ Length of a vector in 2-space.

    Params: v (2-tuple) vector in 2-space
    Returns: (float) length
    """
    number = 0
    for i in range(len(str(v))):
        number += v[i]**2
    return math.sqrt(number)

I know that's an error as it's trying to multiply an index of (0,0) by itself. I'm not asking for a full out solution, but a pointer in the right direction.

Thanks!