Drop outdated Python version checks

Author: mwcraig

vpython/__init__.py

@@ -9,21 +9,7 @@
 #  __gs_version__ exist before importing vpython, which itself imports
 # both of those.
 
-from ._notebook_helpers import _isnotebook, __is_spyder
-import sys
-__v = sys.version_info
-
-# Delete sys now that we are done with it
-del sys
-
-__ispython3 = (__v.major == 3)
-__require_notebook = (not __ispython3) or (__v.minor < 5) # Python 2.7 or 3.4 require Jupyter notebook
-
-if __require_notebook and (not _isnotebook):
-        s = "The non-notebook version of vpython requires Python 3.5 or later."
-        s += "\nvpython does work on Python 2.7 and 3.4 in the Jupyter notebook environment."
-        raise Exception(s)
-
+from ._notebook_helpers import __is_spyder
 
 from .vpython import canvas
 

vpython/vpython.py

@@ -28,13 +28,8 @@
            'standardAttributes', 'text', 'textures', 'triangle', 'vertex',
            'wtext', 'winput', 'keysdown']
 
-__p = platform.python_version()
-_ispython3 = (__p[0] == '3')
 
-if _ispython3:
-    from inspect import signature # Python 3; needed to allow zero arguments in a bound function
-else:
-    from inspect import getargspec # Python 2; needed to allow zero arguments in a bound function
+from inspect import signature # Python 3; needed to allow zero arguments in a bound function
 
 # __version__ is the version number of the Jupyter VPython installer, generated in building the installer.
 version = [__version__, 'jupyter']