我在cmakelists.txt中启用了python函数，使用catkin_make时遇到了一个奇怪的问题，如下所示：

cmake_minimum_required(VERSION 3.0.2)
project(transmit)
set(Python3_INCLUDE_DIRS "/usr/include/python3.6m")
set(Python3_LIBRARIES "/usr/lib/python3.6/config-3.6m-x86_64-linux-gnu/libpython3.6.so")
set(PYTHON_EXECUTABLE "/usr/bin/python3.6")
find_package(catkin REQUIRED COMPONENTS
        roscpp
        rospy
        sensor_msgs
        std_msgs
        )
catkin_package(
        CATKIN_DEPENDS roscpp rospy sensor_msgs std_msgs
)

include_directories(
        include
        ${catkin_INCLUDE_DIRS}
        ${Python3_INCLUDE_DIRS}
)
add_executable(transmit src/transmit.cpp)
target_link_libraries(${PROJECT_NAME}
        ${catkin_LIBRARIES}
        ${Python3_LIBRARIES}
        )

执行catkin_make后，终端报错如下：

Traceback (most recent call last):
  File "/opt/ros/melodic/bin/catkin_make", line 13, in <module>
    from catkin.builder import apply_platform_specific_defaults  # noqa: E402
  File "/opt/ros/melodic/lib/python2.7/dist-packages/catkin/builder.py", line 54, in <module>
    from catkin_pkg.packages import find_packages
  File "/usr/local/lib/python3.6/dist-packages/catkin_pkg/packages.py", line 38, in <module>
    from .package import _get_package_xml
  File "/usr/local/lib/python3.6/dist-packages/catkin_pkg/package.py", line 44, in <module>
    from catkin_pkg.condition import evaluate_condition
  File "/usr/local/lib/python3.6/dist-packages/catkin_pkg/condition.py", line 17, in <module>
    import pyparsing as pp
  File "/usr/local/lib/python3.6/dist-packages/pyparsing/__init__.py", line 100
    major: int
         ^
SyntaxError: invalid syntax

好像是一个python官方包有语法错误，很奇怪，怎么解决这个问题呢？