diff --git a/icartt/__init__.py b/icartt/__init__.py
index 15ce3a929aa1f317a6cd575b8bac417bec3ff8ae..c7b28ee49cd7969c9293c6bb726a733d5c9d6974 100644
--- a/icartt/__init__.py
+++ b/icartt/__init__.py
@@ -1 +1 @@
-from dataset import *
\ No newline at end of file
+from .dataset import *
\ No newline at end of file
diff --git a/icartt/dataset.py b/icartt/dataset.py
index c13dfab9ed5cc3c49374de6b758c90503a19d560..684aa8db4c45a89ea3388c324a0e4e15380fc1c2 100644
--- a/icartt/dataset.py
+++ b/icartt/dataset.py
@@ -263,7 +263,7 @@ class Dataset:
         if self.input_fhandle.closed:
             self.input_fhandle = open(self.input_fhandle.name)
 
-        nul = [ self.input_fhandle.readline() for i in xrange(self.nheader) ]
+        nul = [ self.input_fhandle.readline() for i in range(self.nheader) ]
 
         self.data = [ self.__nan_miss_float(line.split(self.splitChar)) for line in self.input_fhandle ]
 
@@ -277,7 +277,7 @@ class Dataset:
         if self.input_fhandle.closed:
             self.input_fhandle = open(self.input_fhandle.name)
 
-        nul = [ self.input_fhandle.readline() for i in xrange(self.nheader) ]
+        nul = [ self.input_fhandle.readline() for i in range(self.nheader) ]
 
         first = self.input_fhandle.readline()
         self.data  = [ self.__nan_miss_float(first.split(self.splitChar)) ]