# your code goes here b={} j={} c={} b['m']=1 b['n']=2 j['h']=4 c['b']=b c['j']=j print len(c[b])
Standard input is empty
Standard output is empty
Traceback (most recent call last): File "prog.py", line 10, in <module> TypeError: unhashable type: 'dict'