Merge pull request #1614 from blink1073/handle-pip-upgrade

Do not try and upgrade other large dependencies on pip install

setup.py

@@ -63,8 +63,14 @@ if __name__ == "__main__":
     try:
         from numpy.distutils.core import setup
         extra = {'configuration': configuration}
-        # do not risk updating numpy
-        INSTALL_REQUIRES = [r for r in INSTALL_REQUIRES if 'numpy' not in r]
+        # Do not try and upgrade larger dependencies
+        for lib in ['scipy', 'numpy', 'matplotlib', 'pillow']:
+            try:
+                __import__(lib)
+                INSTALL_REQUIRES = [i for i in INSTALL_REQUIRES
+                                    if lib not in i]
+            except ImportError:
+                pass
     except ImportError:
         if len(sys.argv) >= 2 and ('--help' in sys.argv[1:] or
                                    sys.argv[1] in ('--help-commands',