Error "No module named 'catkin_pkg'" while creating catkin_package

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Hi,

I am creating catkin package and for that I have been following this page. I can run all the commands in that page correctly with out error except the following one

$ catkin_make -DPYTHON_EXECUTABLE=/usr/bin/python3 -DPYTHON_INCLUDE_DIR=/usr/include/python3.7m -DPYTHON_LIBRARY=/usr/lib/libpython3.7m.so

While I run the above command I get the error as follows

catkin_make -DPYTHON_EXECUTABLE=/usr/bin/python3 -DPYTHON_INCLUDE_DIR=/usr/include/python3.7m -DPYTHON_LIBRARY=/usr/lib/libpython3.7m.so
Base path: /home/simbot/baxter_ws
Source space: /home/simbot/baxter_ws/src
Build space: /home/simbot/baxter_ws/build
Devel space: /home/simbot/baxter_ws/devel
Install space: /home/simbot/baxter_ws/install
####
#### Running command: "cmake /home/simbot/baxter_ws/src -DPYTHON_EXECUTABLE=/usr/bin/python3 -DPYTHON_INCLUDE_DIR=/usr/include/python3.7m -DPYTHON_LIBRARY=/usr/lib/libpython3.7m.so -DCATKIN_DEVEL_PREFIX=/home/simbot/baxter_ws/devel -DCMAKE_INSTALL_PREFIX=/home/simbot/baxter_ws/install -G Unix Makefiles" in "/home/simbot/baxter_ws/build"
####
-- Using CATKIN_DEVEL_PREFIX: /home/simbot/baxter_ws/devel
-- Using CMAKE_PREFIX_PATH: /opt/ros/kinetic
-- This workspace overlays: /opt/ros/kinetic
-- Found PythonInterp: /usr/bin/python3 (found version "3.5.2") 
-- Using PYTHON_EXECUTABLE: /usr/bin/python3
-- Using Debian Python package layout
-- Using empy: /usr/bin/empy
-- Using CATKIN_ENABLE_TESTING: ON
-- Call enable_testing()
-- Using CATKIN_TEST_RESULTS_DIR: /home/simbot/baxter_ws/build/test_results
-- Found gmock sources under '/usr/src/gmock': gmock will be built
-- Found gtest sources under '/usr/src/gmock': gtests will be built
-- Using Python nosetests: /usr/bin/nosetests-2.7
ImportError: "from catkin_pkg.package import parse_package" failed: No module named 'catkin_pkg'
Make sure that you have installed "catkin_pkg", it is up to date and on the PYTHONPATH.
CMake Error at /opt/ros/kinetic/share/catkin/cmake/safe_execute_process.cmake:11 (message):
execute_process(/usr/bin/python3
"/opt/ros/kinetic/share/catkin/cmake/parse_package_xml.py"
"/opt/ros/kinetic/share/catkin/cmake/../package.xml"
"/home/simbot/baxter_ws/build/catkin/catkin_generated/version/package.cmake")
returned error code 1
Call Stack (most recent call first):
/opt/ros/kinetic/share/catkin/cmake/catkin_package_xml.cmake:74 (safe_execute_process)
/opt/ros/kinetic/share/catkin/cmake/all.cmake:167 (_catkin_package_xml)
/opt/ros/kinetic/share/catkin/cmake/catkinConfig.cmake:20 (include)
CMakeLists.txt:56 (find_package)


-- Configuring incomplete, errors occurred!
See also "/home/simbot/baxter_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/simbot/baxter_ws/build/CMakeFiles/CMakeError.log".
Invoking "cmake" failed

From the error I can understand that I am missing 'catkin_pkg' . So I tried to follow the instructions given in this page by running the command pip install catkin_pkg and I am prompted with successful installation with the following message,

Collecting catkin_pkg
Collecting python-dateutil (from catkin_pkg)
Using cached https://files.pythonhosted.org/packages/41/17/c62faccbfbd163c7f57f3844689e3a78bae1f403648a6afb1d0866d87fbb/python_dateutil-2.8.0-py2.py3-none-any.whl
Collecting docutils (from catkin_pkg)
Using cached https://files.pythonhosted.org/packages/3a/dc/bf2b15d1fa15a6f7a9e77a61b74ecbbae7258558fcda8ffc9a6638a6b327/docutils-0.15.2-py2-none-any.whl
Collecting pyparsing (from catkin_pkg)
Using cached https://files.pythonhosted.org/packages/11/fa/0160cd525c62d7abd076a070ff02b2b94de589f1a9789774f17d7c54058e/pyparsing-2.4.2-py2.py3-none-any.whl
Collecting six>=1.5 (from python-dateutil->catkin_pkg)
Using cached https://files.pythonhosted.org/packages/73/fb/00a976f728d0d1fecfe898238ce23f502a721c0ac0ecfedb80e0d88c64e9/six-1.12.0-py2.py3-none-any.whl
Installing collected packages: six, python-dateutil, docutils, pyparsing, catkin-pkg
Successfully installed catkin-pkg-0.4.14 docutils-0.15 ...