I created a ROS package, `my_package`, with dependencies `rospy` and `geometry_msgs`. Then I created a Python script, `my_script.py`, (which is located under `src`) for `my_package`.
To my surprise, in `my_script.py`, I can import from the package `turtlesim`, like `from turtlesim.msg import Pose`, without getting errors. So, `turtlesim` seems to be part of my dependencies. Why is that?
If execute the following command on the terminal `rospack depends my_package`, the output is the following:
cpp_common
rostime
roscpp_traits
roscpp_serialization
catkin
genmsg
genpy
message_runtime
std_msgs
geometry_msgs
gencpp
geneus
gennodejs
genlisp
message_generation
rosbuild
rosconsole
rosgraph_msgs
xmlrpcpp
roscpp
rosgraph
ros_environment
rospack
roslib
rospy
which does not include `turtlesim`.
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