python函数后面有多个括号怎么理解?

时间:2022-08-09 16:39:17

一般而言,函数后面只有一个括号。如果看见括号后还有一个括号,说明第一个函数返回了一个函数,如果后面还有括号,说明前面那个也返回了一个函数。以此类推。

比如fun()()

def fun():
print("this is fun");
def _fun():
print("this is _fun");
return _fun;

Your task is to write a higher order function for chaining together a list of unary functions. In other words, it should return a function that does a left fold on the given functions.
chained([a,b,c,d])(input)

Should yield the same result as

d(c(b(a(input))))

def fun81(functions):
def f(x):
for fun in functions:
x = fun(x);
return x;
return f;

小结:python中也可以链式点用函数,只是函数需要在返回一个函数。