moving cimport to helper, so it can become a template

Author: realead

pandas/_libs/hashtable.pyx

@@ -14,47 +14,6 @@ cnp.import_array()
 
 from pandas._libs cimport util
 from pandas._libs.khash cimport (
-    kh_destroy_float64,
-    kh_destroy_int64,
-    kh_destroy_int32,
-    kh_destroy_pymap,
-    kh_destroy_str,
-    kh_destroy_uint64,
-    kh_exist_float64,
-    kh_exist_int64,
-    kh_exist_int32,
-    kh_exist_pymap,
-    kh_exist_str,
-    kh_exist_uint64,
-    kh_float64_t,
-    kh_get_float64,
-    kh_get_int64,
-    kh_get_int32,
-    kh_get_pymap,
-    kh_get_str,
-    kh_get_strbox,
-    kh_get_uint64,
-    kh_init_float64,
-    kh_init_int64,
-    kh_init_int32,
-    kh_init_pymap,
-    kh_init_str,
-    kh_init_strbox,
-    kh_init_uint64,
-    kh_int64_t,
-    kh_put_float64,
-    kh_put_int64,
-    kh_put_int32,
-    kh_put_pymap,
-    kh_put_str,
-    kh_put_strbox,
-    kh_put_uint64,
-    kh_resize_float64,
-    kh_resize_int64,
-    kh_resize_int32,
-    kh_resize_pymap,
-    kh_resize_str,
-    kh_resize_uint64,
     kh_str_t,
     khiter_t,
 )

pandas/_libs/hashtable_class_helper.pxi.in

@@ -5,6 +5,30 @@ WARNING: DO NOT edit .pxi FILE directly, .pxi is generated from .pxi.in
 """
 
 
+
+{{py:
+
+# name
+cimported_types = ['float64',
+                   'int64',
+                   'int32',
+                   'pymap',
+                   'str',
+                   'strbox',
+                   'uint64']
+}}
+
+{{for name in cimported_types}}
+from pandas._libs.khash cimport (
+    kh_destroy_{{name}},
+    kh_exist_{{name}},
+    kh_get_{{name}},
+    kh_init_{{name}},
+    kh_put_{{name}},
+    kh_resize_{{name}},
+)
+{{endfor}}
+
 # ----------------------------------------------------------------------
 # VectorData
 # ----------------------------------------------------------------------