diff --git a/fix_code_style.py b/fix_code_style.py
deleted file mode 100644
index 9b0cf06..0000000
--- a/fix_code_style.py
+++ /dev/null
@@ -1,42 +0,0 @@
-# -*- coding: utf-8 -*-
-
-"""
-This script provides dev-ops tools for python project development.
-"""
-
-from __future__ import print_function
-from pathlib_mate import Path
-from setup import package
-
-
-def fixcode(**kwargs):
-    """
-    auto pep8 format all python file in ``source code`` and ``tests`` dir.
-    """
-    # repository direcotry
-    repo_dir = Path(__file__).parent.absolute()
-
-    # source code directory
-    source_dir = Path(repo_dir, package.__name__)
-
-    if source_dir.exists():
-        print("Source code locate at: '%s'." % source_dir)
-        print("Auto pep8 all python file ...")
-        source_dir.autopep8(**kwargs)
-    else:
-        print("Source code directory not found!")
-
-    # unittest code directory
-    unittest_dir = Path(repo_dir, "tests")
-    if unittest_dir.exists():
-        print("Unittest code locate at: '%s'." % unittest_dir)
-        print("Auto pep8 all python file ...")
-        unittest_dir.autopep8(**kwargs)
-    else:
-        print("Unittest code directory not found!")
-
-    print("Complete!")
-
-
-if __name__ == "__main__":
-    fixcode()
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 1f7a431..3e5ce3a 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,5 +1,4 @@
 # This requirements file should only include dependencies for development
-pathlib_mate                            # autopep8 your code
 twine                                   # make distribution archive
 wheel                                   # make pre-compiled distribution package
 fire
diff --git a/requirements-test.txt b/requirements-test.txt
index 0548f9d..841760c 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,3 +1,4 @@
 # This requirements file should only include dependencies for testing
 pytest                                  # test framework
 pytest-cov                              # coverage test
+pathlib_mate
diff --git a/tox.ini b/tox.ini
deleted file mode 100644
index 5a1603e..0000000
--- a/tox.ini
+++ /dev/null
@@ -1,18 +0,0 @@
-# Tox is a generic virtualenv management and test command line tool you can use for:
-# checking your package installs correctly with different Python versions and interpreters
-# running your tests in each of the environments, configuring your test tool of choice
-# acting as a frontend to Continuous Integration servers, greatly reducing boilerplate and merging CI and shell-based testing.
-#
-# content of: tox.ini , put in same dir as setup.py
-# for more info: http://tox.readthedocs.io/en/latest/config.html
-[tox]
-envlist = py38
-
-[testenv]
-deps =
-    -rrequirements.txt
-    -rrequirements-test.txt
-
-commands =
-    pip install --editable .
-    pytest tests