Reindexing a pandas DataFrame using a dict (python3)

Question

Is there a way, without use of loops, to reindex a DataFrame using a dict? Here is an example:

df = pd.DataFrame([[1,2], [3,4]])
dic = {0:'first', 1:'second'}

I want to apply something efficient to df for obtaining:

        0  1
first   1  2
second  3  4

Speed is important, as the index in the actual DataFrame I am dealing with has a huge number of unique values. Thanks

Answer 1

You need the rename function:

df.rename(index=dic)

#       0   1
#first  1   2
#second 3   4

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Modified the dic to get the results: dic = {0:'first', 1:'second'}