python局部作用域是什么

def my_func():
    x = 10
    print(x)
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                <h1>print(x)  # 这里会报错：NameError: name 'x' is not defined</h1><p>

x = 20
<p>def show():
x = 5  # 这是局部变量
print(x)</p><p>show()     # 输出 5
print(x)   # 输出 20（全局的x没变）