I am comfused about the name behavior of Python in recursion

[380162267qq]

Google told me Python name is a label attaching to the object.
But in this recursive function,the name 'a' will point to different number 
object.

def rec(a):
        a+=1
        if a<10:
                rec(a)
        print(a)

rec(0) gives me 10....1 normally.Why it works? Because of the stack memory 
management?

Thank you
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