source: MPbranch/GSASIIpath.py @ 1113

''' determine a binary path for the pyd files based on the host OS and the python version,
path is relative to location of the script that is called as well as this file
this must be imported before anything that imports any .pyd/.so file for GSASII

also determine if GSAS-II is being run interactively'''

import os.path as ospath
import sys
import platform

# Find the name of the main routine and if we are running interactively (true if GSASII.py)
import __main__
GSAS2interactive = False
try:
    if ospath.split(__main__.__file__)[1].lower() == "gsasii.py":
        GSAS2interactive = True
except:
   pass

# define the path to where GSAS-II source files are found from the location of
# the current file
path2GSAS2 = ospath.dirname(ospath.realpath(__file__))

bindir = None
if sys.platform == "win32":
    if platform.architecture()[0] == '64bit':
        bindir = 'binwin64-%d.%d' % sys.version_info[0:2]
    else:
        bindir = 'binwin%d.%d' % sys.version_info[0:2]
elif sys.platform == "darwin":
    bindir = 'binmac%d.%d' % sys.version_info[0:2]
elif sys.platform == "linux2":
    if platform.architecture()[0] == '64bit':
        bindir = 'binlinux64-%d.%d' % sys.version_info[0:2]
    else:
        bindir = 'binlinux%d.%d' % sys.version_info[0:2]
for loc in sys.path[0],path2GSAS2:
    if bindir:
        if ospath.exists(ospath.join(loc,bindir)) and ospath.join(loc,bindir) not in sys.path: 
            sys.path.insert(0,ospath.join(loc,bindir))
        # is there a bin directory? (created by a local compile), if so put
        # that at the top of the path
    if ospath.exists(ospath.join(loc,'bin')):
        bindir = 'bin'
        if ospath.join(loc,'bin') not in sys.path: 
            sys.path.insert(0,ospath.join(loc,bindir))
if bindir == None:
    print "Warning GSAS-II binary libraries not found, some sections of code will not function"