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a=1
print id(a)
a=2
print id(a)
a=a+1
print id(a) 
-------------------------------------------------------------------------------------------------------------------------
t=6
def tt():
    global t
    t=t+1
    print t
print t
tt()
½á¹ûΪ£º
6
7
-------------------------------------------------------------------------------------------------------------------------
t=6
def tt():
    t=t+1
    print t
print t
tt()
½á¹û£º³ö´í exceptions.UnboundLocalError: local variable 't' referenced before assignment    
-------------------------------------------------------------------------------------------------------------------------
def f1(n):
    m=n
    def f2(i):
            print m,i         
    return f2
a=f1(2)
b=f1(3)
a(1)
b(2)
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2 1
3 2
-------------------------------------------------------------------------------------------------------------------------
m=999
def f1(n):
    m=n
    def f2(i):
        global m
        print m,i
    return f2
a=f1(2)
b=f1(3)
a(1)
b(2)
½á¹ûΪ£º
999 1
999 2


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