>>> mydict = {'one': [1,2,3], 2: [4,5,6,7], 3: 8}
>>> dict_df = pd.DataFrame({ key:pd.Series(value) for key, value in mydict.items() })
>>> dict_df
one 2 3
0 1.0 4 8.0
1 2.0 5 NaN
2 3.0 6 NaN
3 NaN 7 NaN
>>> mydict = {'one': [1,2,3], 2: [4,5,6,7], 3: 8}
>>> dict_df = pd.DataFrame({ key:pd.Series(value) for key, value in mydict.items() })
>>> dict_df
one 2 3
0 1.0 4 8.0
1 2.0 5 NaN
2 3.0 6 NaN
3 NaN 7 NaN