The current function used to show a key/value:

# Show a limited length version of a key/value
def show_kv(kv):
    s = str(kv)
    if len(s) > 100:
        s = s[0:100] + '...'
    return s

I like it but we should show the last bits, especially for the keys as we may have hundreds of 0's and then a number.