Helper functions for debugging deeply nested data structures on the console.

compare.py

def dictcompare(da, db):
    ka = set(da.keys())
    kb = set(db.keys())

    if ka & kb:
        if ka - kb:
            print 'Keys only in A:', ka - kb
        if kb - ka:
            print 'Keys only in B:', kb - ka
    else:
        print 'No keys in common'

    differing_keys = [k for k in ka & kb if da[k] != db[k]]
    if differing_keys:
        print 'Keys with different values:', ', '.join(differing_keys)

def listcompare(la, lb):
    na = len(la)
    nb = len(lb)

    if na != nb:
        print 'Lists have different lengths'

    differing_indices = [i for i, (xa, xb) in enumerate(zip(la, lb)) if xa != xb]
    if differing_indices:
        print 'Indices with different values:', ', '.join(map(str, differing_indices))

def compare(a, b):
    if isinstance(a, list) and isinstance(b, list):
        listcompare(a, b)
    elif isinstance(a, dict) and isinstance(b, dict):
        dictcompare(a, b)
    elif type(a) != type(b):
        print 'Values have different types ({0} and {1})'.format(type(a), type(b))
    elif a != b:
        print 'a == {0}, b == {1}'.format(repr(a), repr(b))