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prashnts/pandas_ix.py

Created December 21, 2016 08:47
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Perf comparison when using Integer vs. String indexes in a Pandas DF
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pandas_ix.py
import pandas as pd
import numpy as np
LIM = 100000
df_i = pd.DataFrame(np.random.randint(0, 100, size=(LIM, 4)), columns=list('ABCD'), index=list(range(0, LIM)))
df_s = pd.DataFrame(np.random.randint(0, 100, size=(LIM, 4)), columns=list('ABCD'), index=list(map(hex, range(0, LIM))))
## used in ipython
>>> %timeit -n 100 df.sort_values('A')
100 loops, best of 3: 10.6 ms per loop
>>> %timeit -n 100 df_s.sort_values('A')
100 loops, best of 3: 18.1 ms per loop
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