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()
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
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."
其他回答
只是一个简单的贡献。如果我们需要实例化的类在同一个文件中,我们可以使用类似的方法:
# Get class from globals and create an instance
m = globals()['our_class']()
# Get the function (from the instance) that we need to call
func = getattr(m, 'function_name')
# Call it
func()
例如:
class A:
def __init__(self):
pass
def sampleFunc(self, arg):
print('you called sampleFunc({})'.format(arg))
m = globals()['A']()
func = getattr(m, 'sampleFunc')
func('sample arg')
# Sample, all on one line
getattr(globals()['A'](), 'sampleFunc')('sample arg')
如果不是类:
def sampleFunc(arg):
print('you called sampleFunc({})'.format(arg))
globals()['sampleFunc']('sample arg')
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')
还没有人提到operator.attrgetter:
>>> from operator import attrgetter
>>> l = [1, 2, 3]
>>> attrgetter('reverse')(l)()
>>> l
[3, 2, 1]
>>>
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."
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