simple threading question

I started to approach multi threading, but I need something confirmed. For my testing purposes, I am using python 2.7.11 on Linux.

I put something really simple together. Two threads start at the same time and count to 9. One starts counting at 1 and the other one starts at 2.

import threading

class myThread(threading.Thread):
    def __init__(self,threadId):
        threading.Thread.__init__(self)
        self.threadId=threadId
    def run(self):
        while self.threadId < 10:
        print self.threadId
        self.threadId+=1

thread1=myThread(1)
thread2=myThread(2)

thread1.start()
thread2.start()

My expectation was line by line counting to 9. The output sometimes looks like this:

1
22

3
34

5
46

7
58

6
9
7
8
9

Apparently, they can write in the same line while the other process is still going on? The line breaker does not always get called properly. Is this as expected?

For testing purposes I changed:

print self.threadId

to

print "cookies", self.threadId

Now the output looks like this:

cookiescookies  12

cookies 3cookies 2

cookies cookies 4
3cookies 5

cookies 4cookies
6cookies 5

cookies 7cookies 6

cookies 8cookies 7

cookies cookies 89

cookies 9

It looks like, we at do not overwrite "cookies". For my next test, I changed:

print "cookies", self.threadId

to

temp="cookies cake", self.threadId
print temp

The output is even more all over the place: (('cookies cake', 'cookies cake', 21))

('cookies cake'('cookies cake', , 3)2
)
('cookies cake'('cookies cake', , 43))

('cookies cake'('cookies cake', , 45))

('cookies cake'('cookies cake', 6)
, 5)
('cookies cake'('cookies c, ake'7)
('cookies cake', 8)
('cookies cake', 9)
, 6)
('cookies cake', 7)
('cookies cake', 8)
('cookies cake', 9)

Is this as expected? Because "duh this is multi threading?"