Why doesn't rospack list runtime dependencies?

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Why doesn't rospack list runtime dependencies?

it does, but rospack only lists dependencies of your package that are ROS packages.

That's why you "only see message_filters, rosbag, rospy and tf" when you ran rospack depends1 my_package.

If you want to list system dependencies -- which your python-* keys are -- you'd need to run rosdep.

rospack does have a proxy for that, so you should get the output you are looking for by running:

rospack rosdep my_package

For roscpp, we get:

user@machine:/# rospack rosdep roscpp
name: apr
name: boost
name: cmake
name: google-mock
name: gtest
name: libconsole-bridge-dev
name: log4cxx
name: pkg-config
name: python-argparse
name: python-catkin-pkg
name: python-empy
name: python-mock
name: python-nose
name: python-yaml

while we get a different list with just rospack depends:

cpp_common
message_runtime
rosconsole
roscpp_serialization
roscpp_traits
rosgraph_msgs
rostime
std_msgs
xmlrpcpp

which are the ROS packages that roscpp depends on.

Please, do not tell me that I need to do pip install pandas, when there is this mentioned article http://docs.ros.org/lunar/api/catkin/...!

Using pip is never something anyone should recommend, especially not on platforms with a proper package manager.