如何在 python 中获取内部 function 值？

Question

我想知道在 python3 中获取outer_function值的正确语法是什么（如下面的第一次打印 =>预期结果）：

def outer_function():
    def inner_function():
        return u'{"f1":["x1", "y1", "z1"], "f2":["x2", "y2", "y3"]}'
    return inner_function


print(u'{"f1":["x1", "y1", "z1"], "f2":["x2", "y2", "y3"]}')
print(outer_function())

第一次打印是： {"f1":["x1", "y1", "z1"], "f2":["x2", "y2", "y3"]}

第二次打印是： <function outer_function.<locals>.inner_function at 0x7f1bf20e0dc0>

Answer 1

您应该返回 inner_function() 而不是 inner_function。

https://www.geeksforgeeks.org/python-invoking-functions-with-and-without-parentheses/

def outer_function():
    def inner_function():
        return u'{"f1":["x1", "y1", "z1"], "f2":["x2", "y2", "y3"]}'
    return inner_function()


print(u'{"f1":["x1", "y1", "z1"], "f2":["x2", "y2", "y3"]}')
print(outer_function())

Answer 2

目前从outer_function inner_function引用。 您要查找的值是inner_function的返回值，因此您也需要调用它。

def outer_function():
    def inner_function():
        return '{"f1":["x1", "y1", "z1"], "f2":["x2", "y2", "y3"]}'

    return inner_function


print(outer_function()())

或者：

def outer_function():
    def inner_function():
        return '{"f1":["x1", "y1", "z1"], "f2":["x2", "y2", "y3"]}'

    return inner_function


inner = outer_function()
print(inner)   # same output as you got.
print(inner())

您还可以在outer_function本身中返回inner_function的返回值：

def outer_function():
    def inner_function():
        return '{"f1":["x1", "y1", "z1"], "f2":["x2", "y2", "y3"]}'

    return inner_function()

print(outer_function())