Call a function from a stored string in Python

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Calling a function of a module by using its name (a string) 10 answers

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你可以这样做 ：

eval(input("What function do you want to call? ") + '()')

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使用一个字典映射名称的功能。

call_dict = {
    'foo': foo,
    'bar': bar
}
call_dict[callfunction]()

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It is quite common in Python to use the command pattern. First move all of your functions into a class, and give them names which have a prefix that isn't used in the input. Then use getattr() to find the correct function and call it.

class Commands():
   def cmd_foo(self):
       print("Foo")

   def callFunction(self, name):
       fn = getattr(self, 'cmd_'+name, None)
       if fn is not None:
            fn()

This has a couple of advantages over Daniel's call_dict: you don't have to list the name of the functions a second time, and you don't have to list the callable functions a second time either.

The 'cmd_' prefix is there to ensure you can have other methods in the class but still control exactly which ones are directly callable.

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