将任意函数的输出转换为列表

Question

我有一个功能。它打印字符串。如何在列表中最好地收集这些字符串？

即。

def FUN(a):
...
    print(somestrings)

Answer 1

x = list()

x.append(strings1)  # use a loop of some sort to append your strings
x.append(strings2)
. 
.
.
x.append(stringsN)

return x

Answer 2

您可以暂时将sys.stdout更改为自定义类：

import sys

def fun(a,b):
    print(a)
    print(b)

class Catcher:
    def __init__(self):
        self.res = []
        self.stdout = sys.stdout
        sys.stdout = self
    def write(self, chars):
        self.res.append(chars)
    def call(self, fun, *args, **kwargs):
        fun(*args, **kwargs)
        sys.stdout = self.stdout
        return self.res

print(Catcher().call(fun, "hello", b="world!"))

=> ['hello', '\n', 'world!', '\n']