BLD: narrower check into pandas.lib ImportError, close #1845

Author: wesm

RELEASE.rst

@@ -102,6 +102,7 @@ pandas 0.8.2
     rolling_std (#1840)
   - Let Series.str.split accept no arguments (like str.split) (#1859)
   - Allow user to have dateutil 2.1 installed on a Python 2 system (#1851)
+  - Catch ImportError less aggressively in pandas/__init__.py (#1845)
 
 pandas 0.8.1
 ============

pandas/__init__.py

@@ -11,7 +11,7 @@
 except Exception:  # pragma: no cover
     import sys
     e = sys.exc_info()[1] # Py25 and Py3 current exception syntax conflict
-    if 'No module named' in str(e):
+    if 'No module named lib' in str(e):
         raise ImportError('C extensions not built: if you installed already '
                           'verify that you are not importing from the source '
                           'directory')