python - function 14, global and nonlocal

1. global: modify global variables locally

x=100
def foo():
    global x
    x=200
foo()
print (x)
 # todo prints 100 if global is not written

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2, nonlocal: only find variables inside the function, if not, an error will be reported

x=100
def a():
    x=200
    def b():
        x=300
        def c():
            nonlocal x
            x=1000
        c()
        print(x)
    b()
a()

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