Compatibility numpy 1.7 vs numpy 1.8

Question

Hi is there a compatibility issue with numpy 1.7 and 1.8? I am getting error with a npy that was created using python 2.7 and numpy 1.7. Now I use python 3.4 and numpy 1.8

Traceback (most recent call last):
  File "C:\Python34\lib\site-packages\numpy\lib\format.py", line 334, in read_array_header_1_0
    d = safe_eval(header)
  File "C:\Python34\lib\site-packages\numpy\lib\utils.py", line 1128, in safe_eval
    ast = compiler.parse(source, mode="eval")
  File "C:\Python34\lib\ast.py", line 35, in parse
    return compile(source, filename, mode, PyCF_ONLY_AST)
  File "<unknown>", line 1
    {'descr': '<f8', 'fortran_order': False, 'shape': (51L,), }
                                                         ^
SyntaxError: invalid syntax

Martin · Accepted Answer · 2014-11-26 09:24:44Z

The problem is in the value of shape key. In python 3 you can't add L after the declaration.

martin@martin-desktop:~$ python3
Python 3.4.2 (default, Oct  8 2014, 13:08:17) 
[GCC 4.9.1] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 3
3
>>> 3L
  File "<stdin>", line 1
    3L
     ^
SyntaxError: invalid syntax
>>>

PEP 237, first drafted in 2001, introduced an effort to remove the distinction between int and long integers. The work was completed in a three-phased approach spanning Python 2.2 through 2.4. Python 3.0 added a final step by officially removing the long() type and long literals (e.g., 123456789L).

In places where you would use long(), int() is the replacement and it will store the value in the correct internal representation.

In places where you used the L suffix to produce long literals, removal of the L is necessary, otherwise a SyntaxError will be raised.

http://docs.pythonsprints.com/python3_porting/py-porting.html#long-integers

Collectives™ on Stack Overflow

Compatibility numpy 1.7 vs numpy 1.8

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related