Hi, The following example illustrates a problem I'm encountering a problem with the np.fromstring function in Python 3: Python 3.1.2 (r312:79360M, Mar 24 2010, 01:33:18) [GCC 4.0.1 (Apple Inc. build 5493)] on darwin Type "help", "copyright", "credits" or "license" for more information.
import numpy as np string = "".join(chr(i) for i in range(256)) a = np.fromstring(string, dtype=np.int8) print(len(string)) 256 print(len(a)) 384
The array 'a' should have the same size as 'string' since I'm using a 1-byte datatype. Is this a bug, or do I need to change the way I use this function in Python 3? I am using Numpy r8523 Cheers, Tom
Sun, 25 Jul 2010 10:17:53 -0400, Thomas Robitaille wrote:
The following example illustrates a problem I'm encountering a problem with the np.fromstring function in Python 3:
Python 3.1.2 (r312:79360M, Mar 24 2010, 01:33:18) [GCC 4.0.1 (Apple Inc. build 5493)] on darwin Type "help", "copyright", "credits" or "license" for more information.
import numpy as np string = "".join(chr(i) for i in range(256)) a = np.fromstring(string, dtype=np.int8) print(len(string)) 256 print(len(a)) 384
The array 'a' should have the same size as 'string' since I'm using a 1-byte datatype. Is this a bug, or do I need to change the way I use this function in Python 3?
np.fromstring("\xe4".decode('latin1'), dtype=np.int8) Traceback (most recent call last): File "<stdin>", line 1, in <module> UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in
That's a bug. It apparently implicitly encodes the Unicode string you pass in to UTF-8, instead of trying to encode in ASCII and fail, like it does on Python 2: position 0: ordinal not in range(128) You probably meant to use byte strings, though: string = b"".join(chr(i).encode('latin1') for i in range(256)) -- Pauli Virtanen
Pauli Virtanen-3 wrote:
That's a bug. It apparently implicitly encodes the Unicode string you pass in to UTF-8, instead of trying to encode in ASCII and fail, like it does on Python 2:
Thanks! Should I file a bug report? Cheers, Tom -- View this message in context: http://old.nabble.com/np.fromstring-and-Python-3-tp29260203p29268008.html Sent from the Numpy-discussion mailing list archive at Nabble.com.
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Pauli Virtanen -
Thomas Robitaille