MAINT avoid importing spc before install

setup.py

@@ -1,14 +1,18 @@
 #!/usr/bin/env python
 
+import os
+
 from distutils.core import setup
 
-import spc
+ver_file = os.path.join('spc', '_version.py')
+with open(ver_file) as f:
+    exec(f.read())
 
 setup(name='spc',
-      version=spc.__version__,
-      description=spc.__doc__,
-      author=spc.__author__,
-      author_email=spc.__author_email__,
+      version=__version__,
+      description=__doc__,
+      author=__author__,
+      author_email=__author_email__,
       url='https://github.com/rohanisaac/spc',
       packages=['spc'],
       install_requires=['numpy'],

spc/__init__.py

@@ -3,8 +3,3 @@
 """
 
 from .spc import File
-
-__author__ = "Rohan Isaac"
-__author_email__ = "rohan_isaac@yahoo.com"
-__version__ = "0.4.0"
-__license__ = "GPLv3"

spc/_version.py

@@ -0,0 +1,4 @@
+__author__ = "Rohan Isaac"
+__author_email__ = "rohan_isaac@yahoo.com"
+__version__ = "0.4.0"
+__license__ = "GPLv3"