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018. Include Launch Files

Difficulty: 🔴 Hard
Category: Advanced Launch
Tags: launch, include, modular, composition
Execution Type: launch_file

Frequency: medium

💡 Why This Problem Matters

A full robot launch file is basically a tree of includes: robot.launch -> (sensors.launch, navigation.launch, control.launch).

Problem Statement

Problem Statement

Build complex systems by including other launch files. This allows for modularity (e.g., including nav2_bringup inside your robot_bringup).

Requirements

  • Include a launch file named other.launch.py from package other_package
  • Pass an argument my_arg:='value' to the included file

Input/Output Format

Output:

  • LaunchDescription with IncludeLaunchDescription

⚠️ Common Pitfalls

  • Syntax around PythonLaunchDescriptionSource (it takes a path string).
  • Passing arguments requires launch_arguments={'key': 'val'}.items().

📚 Helpful Resources

Test Cases

  • Include action: IncludeLaunchDescription used
  • Path substitution: PathJoinSubstitution used
  • Parameter passing: Parameters forwarded

Similar Problems

  • Problem #17

Contributing

Found an issue with this problem's description, or have a better hint?
Open a PR or report it in Discussions.

Note: TestScripts and reference solutions are maintained by the SimuCode team
and are not part of this open spec. This ensures grading integrity on simucode.online.