#No.1


def lazy_sum(*args):
    def sum():
        ax = 0
        for n in args:
            ax = ax + n
        return ax
    return sum

f = lazy_sum(1, 3, 5, 7, 9)
print(f)

x = f()
print(x)

resut:
d:\fly\Python (master -> origin)
λ python test.py
<function lazy_sum.<locals>.sum at 0x0000014CE4C5C9D8>
25

#No.2


def f1(x):
    def f2(y):
        return y ** x
    return f2

a = f1(3)
b = a(2)
c = a(3)

print(b, c)

外层环境（f1），内层函数（f2）
f1为f2提供运行环境

resut:
d:\fly\Python (master -> origin)
λ python test.py
8 27