Nodes not deactivated when process is ended

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What I am doing
I am running the ROS Tutorial Writing a Publisher (python).

What I am using
Ubuntu 16.04
ROS kinetic
Python 2.7

What I want to know
I built the code using catkin_make. When running the simple publisher ("talker") provided in the tutorial (see code down below) and check for running nodes I get

$ rosnode list
/rosout
/talker_9026_1529404131936  # since I set anonymous=True

The talker works fine, the listener gets the data as expected. But when stopping the talker (e.g. press ctr + c or closing the terminal-window) the talker-node does not deactivate and is still visible in rosnode list. When restarting the node it starts a new node "/talker" with some other number (since anonymous is set True). Setting anonymous=False does not change this behaviour.
How can I properly end my node when stopping the process? I can end it manually using $ roskill rosmaster, but that's not what I want.

Talker-code:

#!/usr/bin/env python
# license removed for brevity
import rospy
from std_msgs.msg import String

def talker():
    pub = rospy.Publisher('chatter', String, queue_size=10)
    rospy.init_node('talker', anonymous=True)
    rate = rospy.Rate(10) # 10hz
    while not rospy.is_shutdown():
        hello_str = "hello world %s" % rospy.get_time()
        rospy.loginfo(hello_str)
        pub.publish(hello_str)
        rate.sleep()

if __name__ == '__main__':
    try:
        talker()
    except rospy.ROSInterruptException:
        pass