Converting a numpy.ndarray to string

The right answer for numpy is Divakar's ndarray.tostring.

An alternative is to use chr on each array element and join together (for a non numpy array for example):

>>> ''.join([chr(e) for e in my_string_numpy_array])
'My name is Aman Raparia'

Now some years later, np.fromstring() is deprecated:

my_string_numpy_array = np.fromstring(my_string, dtype=np.uint8) :1: DeprecationWarning: The binary mode of fromstring is deprecated, as it behaves surprisingly on unicode inputs. Use frombuffer instead

Use np.frombuffer() instead. And switch back to the input with np.array2string().

import numpy as np

my_string = b"My name is Aman Raparia"
my_string_numpy_array = np.frombuffer(my_string, dtype=np.uint8)
np.array2string(my_string_numpy_array, formatter={'int':lambda x: chr(x).encode()}, separator='').strip('[]').encode()

Out: b'My name is Aman Raparia'

You can drop the .encode() to get string directly. It is just added to get to the original input again, and np.frombuffer() requires a byte formatted buffer.

If you have more than one item as output and then need to remove the []-brackets, see np.array2string not removing brackets around an array.