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from Cython.Build import cythonize
from distutils.core import setup, Extension

ext = Extension(name="wrap_fib", 
    sources=["cfib.c", "wrap_fib.pyx”])

setup(ext_modules=cythonize(ext))

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#!/usr/bin/env python  
import roslib
roslib.load_manifest('learning_tf')

import rospy
import tf

if __name__ == '__main__':
  rospy.init_node('my_tf_broadcaster')
  br = tf.TransformBroadcaster()

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rospack find [package_name]
rospack find roscpp

# goto package directory
roscd roscpp

# go to log directory 
roscd log

# list dir

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to be added 

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# install all dependencies of a package
rosdep install my_package

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# Standard metadata for higher-level stamped data types.
# This is generally used to communicate timestamped data 
# in a particular coordinate frame.
# 
# sequence ID: consecutively increasing ID 
uint32 seq
#Two-integer timestamp that is expressed as:
# * stamp.sec: seconds (stamp_secs) since epoch (in Python the variable is called 'secs')
# * stamp.nsec: nanoseconds since stamp_secs (in Python the variable is called 'nsecs')
# time-handling sugar is provided by the client library

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# show message definition
rosmsg show sensor_msgs/CameraInfo

# show message type
rostopic type rosout

# quick message definition view
rostopic type rosout | rosmsg show

# echo message live content

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# start ros master + rosout + ps
roscore

# list all the running nodes
rosnode list

# get information
rosnode info /rosout

# run ros node

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# list parameter
rosparam list

# set parameter
rosparam set parameter_name 
rosparam set /background_r 150

# get parameter
rosparam get /background_g 

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<launch>

<group ns="turtlesim1">
    <node pkg="turtlesim" name="sim" type="turtlesim_node"/>
  </group>

  <group ns="turtlesim2">
    <node pkg="turtlesim" name="sim" type="turtlesim_node"/>
  </group>