BLD: provide secondary catching of some imports in print_versions.py

     for some reason imp can never find pytz, patsy

Author: jreback

pandas/util/print_versions.py

@@ -54,7 +54,7 @@ def get_sys_info():
 
 
 def show_versions(as_json=False):
-    import imp
+    import imp, importlib
     sys_info = get_sys_info()
 
     deps = [
@@ -89,7 +89,10 @@ def show_versions(as_json=False):
     deps_blob = list()
     for (modname, ver_f) in deps:
         try:
-            mod = imp.load_module(modname, *imp.find_module(modname))
+            try:
+                mod = imp.load_module(modname, *imp.find_module(modname))
+            except (ImportError):
+                mod = importlib.import_module(modname)
             ver = ver_f(mod)
             deps_blob.append((modname, ver))
         except: