[Python] How to convert a list of strings into a numeric numpy array?

I want to be able to calculate the mean, min and max of A:

import numpy as np

A = ['33.33', '33.33', '33.33', '33.37']

NA = np.asarray(A)

AVG = np.mean(NA, axis=0)

print AVG


This does not work, unless converted to:

A = [33.33, 33.33, 33.33, 33.37]


Is it possible to perform this conversion automatically?

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