How do I calculate percentiles with python/numpy?

Question

Is there a convenient way to calculate percentiles for a sequence or single-dimensional numpy array?

I am looking for something similar to Excel's percentile function.

Answer 1

NumPy has np.percentile().

import numpy as np
a = np.array([1,2,3,4,5])
p = np.percentile(a, 50)  # return 50th percentile, i.e. median.

>>> print(p)
3.0

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SciPy has scipy.stats.scoreatpercentile(), in addition to many other statistical goodies.