why the following python program does not face any concurrency problems without synchronize mechanism?

[TheSaint]

smith jack wrote:

>  have run this program for many times,and the result is always 5050
You might not need to make it in a multiprocess environment

Try it in the python (3) shell

>>> tot= 0
>>> for k in range(1,100):
...   tot += k
...   print(tot)
... 

And watch the risults.

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