diff --git a/reacnetgenerator/__init__.py b/reacnetgenerator/__init__.py
index c7541c80a..71a49556a 100644
--- a/reacnetgenerator/__init__.py
+++ b/reacnetgenerator/__init__.py
@@ -1,16 +1,33 @@
 # Copyright 2018-2019, East China Normal University
 """ReacNetGen."""
 
+__date__ = '2018-03-11'
+__update__ = '2019-02-10'
+__author__ = 'Jinzhe Zeng'
+__email__ = 'jzzeng@stu.ecnu.edu.cn'
+__credits__ = ['Jinzhe Zeng', 'Tong Zhu',
+               'Liqun Cao', 'Chih-Hao Chin', 'John ZH Zhang']
+__copyright__ = 'Copyright 2018-2019, East China Normal University'
+
 
 import logging
+
 import coloredlogs
 import matplotlib as mpl
 mpl.use("svg")  # noqa
+from pkg_resources import DistributionNotFound, get_distribution
+
+from .reacnetgen import ReacNetGenerator
 
-from .reacnetgen import ReacNetGenerator, __version__
 
 __all__ = ['ReacNetGenerator']
 
+try:
+    __version__ = get_distribution(__name__).version
+except DistributionNotFound:
+    # package is not installed
+    __version__ = ''
+
 coloredlogs.install(
     fmt=f'%(asctime)s - ReacNetGen {__version__} - %(levelname)s: %(message)s',
     level=logging.INFO, milliseconds=True)
diff --git a/reacnetgenerator/reacnetgen.py b/reacnetgenerator/reacnetgen.py
index eb8b9fa9b..e0916527e 100644
--- a/reacnetgenerator/reacnetgen.py
+++ b/reacnetgenerator/reacnetgen.py
@@ -40,15 +40,6 @@
 $ reacnetgenerator -h
 """
 
-__version__ = '1.2.25'
-__date__ = '2018-03-11'
-__update__ = '2019-02-01'
-__author__ = 'Jinzhe Zeng'
-__email__ = 'jzzeng@stu.ecnu.edu.cn'
-__credits__ = ['Jinzhe Zeng', 'Tong Zhu',
-               'Liqun Cao', 'Chih-Hao Chin', 'John ZH Zhang']
-__copyright__ = 'Copyright 2018-2019, East China Normal University'
-
 
 import argparse
 import base64
@@ -61,8 +52,8 @@
 from multiprocessing import cpu_count
 
 import numpy as np
-from pkg_resources import DistributionNotFound, get_distribution
 
+from . import __version__, __date__, __update__
 from ._detect import InputFileType, _Detect
 from ._draw import _DrawNetwork
 from ._hmmfilter import _HMMFilter
@@ -70,12 +61,6 @@
 from ._path import _CollectPaths
 from ._reachtml import _HTMLResult
 
-try:
-    __version__ = get_distribution(__name__).version
-except DistributionNotFound:
-    # package is not installed
-    pass
-
 
 class ReacNetGenerator:
     """Use ReacNetGenerator for trajectory analysis."""