Question

s = "func"

现在假设有一个名为func的函数。当函数名以字符串形式给出时，如何在Python 2.7中调用func？

Answer 1

最安全的方法：

In [492]: def fun():
   .....:     print("Yep, I was called")
   .....:

In [493]: locals()['fun']()
Yep, I was called

根据您可能需要使用globals()的上下文。

或者你可能想要设置这样的东西：

def spam():
    print("spam spam spam spam spam on eggs")

def voom():
    print("four million volts")

def flesh_wound():
    print("'Tis but a scratch")

functions = {'spam': spam,
             'voom': voom,
             'something completely different': flesh_wound,
             }

try:
    functions[raw_input("What function should I call?")]()
except KeyError:
    print("I'm sorry, I don't know that function")

你也可以将参数传递给你的函数la：

def knights_who_say(saying):
    print("We are the knights who say {}".format(saying))

functions['knights_who_say'] = knights_who_say

function = raw_input("What is your function? ")
if function == 'knights_who_say':
    saying = raw_input("What is your saying? ")
    functions[function](saying)
else:
    functions[function]()

Answer 2

你可以使用exec。不推荐但可行。

s = "func()"

exec s

Answer 3

def func():
    print("hello")
s = "func"
eval(s)()

In [7]: s = "func"

In [8]: eval(s)()
hello

不推荐！只是告诉你如何。

Answer 4

您可以通过传递字符串来执行函数：

exec(s + '()')

Python中的Python调用函数

4 个答案: