图解Python变量与赋值

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>>> 10-a
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
NameError: name 'a' is not defined 

>>> def fun_a(a):
...   a = a+4
...
>>> g = 0
>>> fun_a(g)
>>> g
0 

>>> def fun_b(names):
...   names[0] = ['x', 'y']
...
>>> n_list = ['a','b','c']
>>> fun_b(n_list)
>>>
>>> n_list
[['x','y'], 'b', 'c'] 

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