In [9]: pd.Series(df.Letter.values,index=df.Position).to_dict()
Out[9]: {1: ‘a’, 2: ‘b’, 3: ‘c’, 4: ‘d’, 5: ‘e’}
速度比较（使用Wouter方法）
In [6]: df = pd.Dataframe(randint(0,10,10000).reshape(5000,2),columns=list('AB'))In [7]: %timeit dict(zip(df.A,df.B))1000 loops, best of 3: 1.27 ms per loopIn [8]: %timeit pd.Series(df.A.values,index=df.B).to_dict()1000 loops, best of 3: 987 us per loop
