matmul operator on Python version <= 3.4 (rel: #18)

[max0410]

Test script:

from p5 import *

def setup():
    size(640, 360)
    no_stroke()
    background(204)

def draw():
    if mouse_is_pressed:
        fill(random_uniform(255), random_uniform(127), random_uniform(51), 127)
    else:
        fill(255, 15)

    circle_size = random_uniform(low=10, high=80)

    circle((mouse_x, mouse_y), circle_size)

def key_pressed(event):
    background(204)

run()

Expected behavior:
The video in the README

Actual behavior
An error is thrown.

Errors produced (if any):

Traceback (most recent call last):
  File "C:/Users/User/Dropbox/Programs/p5play.py", line 1, in <module>
    from p5 import *
  File "C:\Python34\lib\site-packages\p5\__init__.py", line 19, in <module>
    from .sketch import *
  File "C:\Python34\lib\site-packages\p5\sketch\__init__.py", line 19, in <module>
    from .base import *
  File "C:\Python34\lib\site-packages\p5\sketch\base.py", line 29, in <module>
    from ..opengl import renderer
  File "C:\Python34\lib\site-packages\p5\opengl\__init__.py", line 19, in <module>
    from .renderer import *
  File "C:\Python34\lib\site-packages\p5\opengl\renderer.py", line 33, in <module>
    from ..pmath import matrix
  File "C:\Python34\lib\site-packages\p5\pmath\__init__.py", line 20, in <module>
    from .vector import *
  File "C:\Python34\lib\site-packages\p5\pmath\vector.py", line 321
    return np.arccos( (self @ other) / (self.magnitude * other.magnitude))
                            ^
SyntaxError: invalid syntax

p5 version:
Newest version

Python version:
Python 3.4.0

Operating System:
Windows 10

[abhikpal]

Hey, this seems to be related to #18. Can you try running your code on a newer version of Python (say, 3.6)?

[AliabbasMerchant]

The syntax of using '@' for matrix multiplication was introduced in Python 3.5.
Also, this problem also includes issues due to tuple unpacking, which was introduced after Python 3.4.

As @abhikpal pointed out, the script will run properly in newer versions of Python.

Maybe we will have to include Python 3.5 in the dependencies of p5py.