#993 fix ironpython detection to match changes in ipy 2.7.12

Author: gonzalocasas

src/compas/__main__.py

@@ -1,10 +1,14 @@
 # -*- coding: utf-8 -*-
 from __future__ import print_function
 
-import sys
-import pkg_resources
-import compas
+import platform
+
+try:
+    import pkg_resources
+except ImportError:
+    pkg_resources = None
 
+import compas
 
 if __name__ == '__main__':
 
@@ -19,11 +23,12 @@
     print('Yay! COMPAS is installed correctly!')
     print()
     print('COMPAS: {}'.format(compas.__version__))
-    print('Python: {}'.format(str(sys.version)))
+    print('Python: {} ({})'.format(platform.python_version(), platform.python_implementation()))
 
-    working_set = pkg_resources.working_set
-    packages = set([p.project_name for p in working_set]) - set(['COMPAS'])
-    compas_pkgs = [p for p in packages if p.lower().startswith('compas')]
+    if pkg_resources:
+        working_set = pkg_resources.working_set
+        packages = set([p.project_name for p in working_set]) - set(['COMPAS'])
+        compas_pkgs = [p for p in packages if p.lower().startswith('compas')]
 
-    if compas_pkgs:
-        print('Extensions: {}'.format([p for p in compas_pkgs]))
+        if compas_pkgs:
+            print('Extensions: {}'.format([p for p in compas_pkgs]))

src/compas/_os.py

@@ -4,11 +4,12 @@
 Not intended to be used outside compas* packages.
 """
 import os
+import platform
 import re
-import tempfile
 import shutil
 import subprocess
 import sys
+import tempfile
 
 try:
     NotADirectoryError
@@ -96,7 +97,7 @@ def is_ironpython():
         True if the implementation is IronPython. False otherwise
 
     """
-    return 'ironpython' in sys.version.lower()
+    return 'ironpython' == platform.python_implementation().lower()
 
 
 def is_rhino():

src/compas/data/encoders.py

@@ -3,12 +3,12 @@
 from __future__ import division
 
 import json
-import sys
+import platform
 
 from compas.data.exceptions import DecoderError
 
 # We don't do this from `compas.IPY` to avoid circular imports
-if 'ironpython' in sys.version.lower():
+if 'ironpython' == platform.python_implementation().lower():
     try:
         from System.Collections.Generic import IDictionary
     except:  # noqa: E722