python - function 12, scope

Order: local scope -> global scope

Global scope: 
         Global scope: Both built-in namespaces and global namespaces belong to the global scope and can be referenced anywhere in the file

a=1
def foo():
    print(a)
    def foo2():
        print(a)
    foo2()
def foo3():
    print(a)
foo()
foo3()

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Local scope: The local namespace belongs to the local scope and can only be referenced inside the function

def x1():       # todo looks inside out
    a=10
    def x2():
        a=20
        def x3():
            a=30
            print(a)
        x3()
    x2()
x1()
#Change def 
x1 ():
    a=10
    def x2():
        a=20
        def x3():
            a=30
            print(a)
        x3()
    x2()
x1()
# todo comment out a=30, because the part is from the inside to the outside, it will output 20 
# todo Similarly, if a=20 is also commented out, it will output 10

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