Python

安装

pip install python-varname

用法

在函数内部检索变量名

from varname import varnamedef function():    return varname()func = function()# func == 'func'# available calls to retrievefunc = function(    # ...)func =     function()func = function     ()# calls lead to failure of retrievingfunc = [function()]

具有长参数列表的函数

def function(*args):    return varname()func = function(    1, # I    2, # have    3, # a    4, # long    5, # argument    6, # list)# func == 'var_0'def function(*args):    return varname(context = 20)func = function(    1, # I    2, # have    3, # a    4, # long    5, # argument    6, # list)# func == 'func'

varname 来电被深深掩埋

def function():    # I know that at which stack this will be called    return varname(caller = 3)def function1():    return function()def function2():    return function1()func = function2()# func == 'func'

检索类对象的实例名称

class Klass:    def __init__(self):        self.id = varname()    def copy(self):        return varname()k = Klass()# k.id == 'k'k2 = k.copy()# k2 == 'k2'

varname调用被深埋在类中

class Klass:    def __init__(self):        self.id = self.some_internal()    def some_internal(self):        return varname(caller = 2)    def copy(self):        return self.copy_id()    def copy_id(self):        return self.copy_id_internal()    def copy_id_internal(self):        return varname(caller = 3)k = Klass()# k.id == 'k'k2 = k.copy()# k2 == 'k2'

如果无法检索名称

varname静态索引的起始位置是0将变量名称标记为失败。

func = [function()]# func == ['var_0']func = function     ()# func == 'var_1'

局限性

• 通话必须以所需格式书写
• 必须事先估计上下文，尤其是对于带有长参数列表的函数
• 你必须知道函数/类将在哪个堆栈中调用
• 为了提高性能，因为涉及检查，所以更好地缓存名称
• 不支持别名

def function():  return varname()func = functionx = func() # unable to detect

误报

def func(**kwargs):    return varname()x = func(    y = func())# x == 'y'# to avoid this, you have to write the kwargs# in the same line where the is calledx = func(y=func())# x == 'x'