python之如何在给定指针的情况下获取函数的名称和/或描述

我正在使用 Python 2.7。有没有办法将名称、描述和可能的其他元数据与函数相关联，这样我就不必使用外部字典来保存此类信息，如下面的代码所示:

def predicateA(v): 
    # some logic that eventually returns a True/False value 
    return True 
 
def predicateB(v): 
    # some logic that eventually returns a True/False value 
    return False 
 
predicateNames={} 
predicateNames[predicateA]='name and description for predicateA' 
predicateNames[predicateB]='name and description for predicateB' 
 
predicates = [predicateA, predicateB] 
 
def evalForAllPredicates(v): 
    for f in predicates: 
       result = f(v) 
       print "function %s returned: %s" % (predicateNames[f], result) 
 
evalForAllPredicates(3) 

请您参考如下方法:

您可以通过 __name__ 和 __doc__ 属性访问函数的名称及其文档字符串。函数的文档字符串只是作为函数中第一条语句放置的字符串文字。约定是使用三重引号将文档字符串括起来，因为它们预计会跨越多行。

def predicateA(v): 
    """ 
    some logic that eventually returns a True/False value 
    """ 
    return True 
 
print "Name:", predicateA.__name__ 
print "Doc:", predicateB.__doc__ 

要将任意元数据关联到一个函数，只需将您喜欢的任何属性分配给该函数，就好像它是一个普通对象一样，毕竟它就是一个普通对象。

def predicateB(v): 
    """ 
    some logic that eventually returns a True/False value 
    """ 
    return False 
 
predicateA.alwaysReturnsFalse = False 
predicateB.alwaysReturnsFalse = True 
 
for pred in [predicateA, predicateB]: 
    print "Function:", pred.__name__ 
    print "Documentation:", pred.__doc__ 
    if pred.alwaysReturnsFalse: 
        print "(This function always returns false)" 

Function: predicateA 
Documentation: 
    some logic that eventually returns a True/False value 
 
Function: predicateB 
Documentation: 
    some logic that eventually returns a True/False value 
 
(This function always returns false)