如何使用带有函数名称的字符串调用函数?例如:

import foo
func_name = "bar"
call(foo, func_name)  # calls foo.bar()

当前回答

还没有人提到operator.attrgetter:

>>> from operator import attrgetter
>>> l = [1, 2, 3]
>>> attrgetter('reverse')(l)()
>>> l
[3, 2, 1]
>>> 

其他回答

这些建议对我都没有帮助。但我确实发现了这一点。

<object>.__getattribute__(<string name>)(<params>)

我使用的是python 2.66

希望这有帮助

虽然getattr()是一种优雅的(大约快7倍)方法,但您可以使用eval从函数(local、class方法、模块)获得返回值,其优雅程度与x=eval('fo.bar')()相同。当您实现一些错误处理时,就会非常安全(getattr也可以使用相同的原理)。模块导入和类示例:

# import module, call module function, pass parameters and print retured value with eval():
import random
bar = 'random.randint'
randint = eval(bar)(0,100)
print(randint) # will print random int from <0;100)

# also class method returning (or not) value(s) can be used with eval: 
class Say:
    def say(something='nothing'):
        return something

bar = 'Say.say'
print(eval(bar)('nice to meet you too')) # will print 'nice to meet you' 

当模块或类不存在(键入错误或其他更好的错误)时,就会引发NameError。如果函数不存在,则引发AttributeError。这可用于处理错误:

# try/except block can be used to catch both errors
try:
    eval('Say.talk')() # raises AttributeError because function does not exist
    eval('Says.say')() # raises NameError because the class does not exist
    # or the same with getattr:
    getattr(Say, 'talk')() # raises AttributeError
    getattr(Says, 'say')() # raises NameError
except AttributeError:
    # do domething or just...
    print('Function does not exist')
except NameError:
    # do domething or just...
    print('Module does not exist')

给定带有方法栏的模块foo:

import foo
bar = getattr(foo, 'bar')
result = bar()

getattr可以类似地用于类实例绑定方法、模块级方法、类方法。。。名单还在继续。

基于Patrick的解决方案,要动态获取模块,请使用以下方法导入:

module = __import__('foo')
func = getattr(module, 'bar')
func()

getattr根据对象的名称调用方法。但此对象应该是调用类的父对象。父类可以由super(self.__class__,self)获取

class Base:
    def call_base(func):
        """This does not work"""
        def new_func(self, *args, **kwargs):
            name = func.__name__
            getattr(super(self.__class__, self), name)(*args, **kwargs)
        return new_func

    def f(self, *args):
        print(f"BASE method invoked.")

    def g(self, *args):
        print(f"BASE method invoked.")

class Inherit(Base):
    @Base.call_base
    def f(self, *args):
        """function body will be ignored by the decorator."""
        pass

    @Base.call_base
    def g(self, *args):
        """function body will be ignored by the decorator."""
        pass

Inherit().f() # The goal is to print "BASE method invoked."