Convert string to numpy array

Question

I have a string like mystr = \"100110\" (the real size is much bigger) I want to convert it to numpy array like mynumpy = [1, 0, 0, 1, 1, 0], mynumpy.shap

Answer 1

Adding to above answers, numpy now gives a deprecation warning when you use fromstring
DeprecationWarning: The binary mode of fromstring is deprecated, as it behaves surprisingly on unicode inputs. Use frombuffer instead.
A better option is to use the fromiter. It performs twice as fast. This is what I got in jupyter notebook -

import numpy as np
mystr = "100110"

np.fromiter(mystr, dtype=int)
>> array([1, 0, 0, 1, 1, 0])

# Time comparison
%timeit np.array(list(mystr), dtype=int)
>> 3.5 µs ± 627 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)

%timeit np.fromstring(mystr, np.int8) - 48
>> 3.52 µs ± 508 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)

%timeit np.fromiter(mystr, dtype=int)
1.75 µs ± 133 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)