你可以將一個函數命名爲用戶輸入嗎？

Question

例如，我想我的代碼是：

name_of_function = input("Please enter a name for the function: ") 
def name_of_function(): 
    print("blah blah blah") 

這將作爲工作：

Please enter a name for the function: hello 
>>>hello() 
blah blah blah 

Answer 1

def hello(): 
    print('Hello!') 

fn_name = input('fn name: ') # input hello 
eval(fn_name)() # this will call the hello function 

警告：通常這是不好的做法，但是這是一種方式做你所要求的。

Answer 2

我會用包含每個函數引用的字典：

def func_one(): 
    print("hello") 

def func_two(): 
    print("goodbye") 

def rename_function(func_dict, orig_name, new_name): 
    func_dict[new_name] = func_dict[orig_name] 
    del func_dict[orig_name] 

functions = { 
    "placeholder_one": func_one, 
    "placeholder_two": func_two 
} 

rename_function(
    functions, 
    "placeholder_one", 
    input("Enter new greeting function name: ") 
) 

rename_function(
    functions, 
    "placeholder_two", 
    input("Enter new farewell function name: ") 
) 

while True: 
    func_name = input("Enter function to call: ") 
    if func_name in functions: 
     functions[func_name]() 
    else: 
     print("That function doesn't exist!") 

用法：

>>> Enter new greeting function name: hello 
>>> Enter new farewell function name: goodbye 
>>> Enter function to call: hello 
hello 
>>> Enter function to call: goodbye 
goodbye 
>>> Enter function to call: hi 
That function doesn't exist! 

Answer 3

您可以，但你真的不應：這就對一百多個奇怪的問題和潛在的問題。但是，如果你堅持，實施將看起來像下面這樣：

def define_function(scope): 

    name_of_function = input("Enter a name for the function: ") 

    function_body = """def {}(): 

         print("Blah blah blah.") 


        """.format(name_of_function) 

    exec(function_body, scope) 

如果從Python外殼，如果導入包含此功能（在我的情況，sandbox.py）文件，並通過globals()或locals()它，你可以很暫時得到你想要的接口。

>>> from sandbox import * 
>>> define_function(globals()) 
Enter a name for the function: hello 
>>> hello() 
Blah blah blah. 

Answer 4

class Foo(object): 
    def foo1(self): 
     print ('call foo1') 

    def foo2(self): 
     print ('call foo2') 

    def bar(self): 
     print ('no function named this') 


def run(func_name): 
    funcs = Foo() 
    try: 
     func = getattr(funcs, func_name) 
    except Exception as ex: 
     funcs.bar() 
     return 
    func() 


func_name = raw_input('please input a function name:') 
run(func_name) 

用法：

請輸入函數名稱：foo1
呼叫foo1

請輸入函數名稱：foo3
沒有名爲此

功能