*Memo:
- My post explains the single, double and triple leading and trailing underscore with the variables, methods and classes in a class.
- My post explains the single, double and triple leading and trailing underscore with variables, functions and classes.
A single, double and triple leading and trailing underscore can be used with the variables, functions and classes in a function:
<The variables in a function>:
def func(): _var = "_var" # SLU (Acceptable) __var = "__var" # DLU (Acceptable) ___var = "___var" # TLU (Acceptable) var_ = "var_" # STU (Acceptable) var__ = "var__" # DTU (Acceptable) var___ = "var___" # TTU (Acceptable) _var_ = "_var_" # SLU & STU (Acceptable) __var_ = "__var_" # DLU & STU (Acceptable) ___var_ = "___var_" # TLU & STU (Acceptable) _var__ = "_var__" # SLU & DTU (Acceptable) __var__ = "__var__" # DLU & DTU (Acceptable) ___var__ = "___var__" # TLU & DTU (Acceptable) _var___ = "_var___" # SLU & TTU (Acceptable) __var___ = "__var___" # DLU & TTU (Acceptable) ___var___ = "___var___" # TLU & TTU (Acceptable) print(_var) # _var print(__var) # __var print(___var) # ___var print(var_) # var_ print(var__) # var__ print(var___) # var___ print(_var_) # _var_ print(__var_) # __var_ print(___var_) # ___var_ print(_var__) # _var__ print(__var__) # __var__ print(___var__) # ___var__ print(_var___) # _var___ print(__var___) # __var___ print(___var___) # ___var___ func() <The functions in a function>:
def func(): def _func(): pass # SLU (Acceptable) def __func(): pass # DLU (Acceptable) def ___func(): pass # TLU (Acceptable) def func_(): pass # STU (Acceptable) def func__(): pass # DTU (Acceptable) def func___(): pass # TTU (Acceptable) def _func_(): pass # SLU & STU (Acceptable) def __func_(): pass # DLU & STU (Acceptable) def ___func_(): pass # TLU & STU (Acceptable) def _func__(): pass # SLU & DTU (Acceptable) def __func__(): pass # DLU & DTU (Acceptable) def ___func__(): pass # TLU & DTU (Acceptable) def _func___(): pass # SLU & TTU (Acceptable) def __func___(): pass # DLU & TTU (Acceptable) def ___func___(): pass # TLU & TTU (Acceptable) print(_func.__name__) # _func print(__func.__name__) # __func print(___func.__name__) # ___func print(func_.__name__) # func_ print(func__.__name__) # func__ print(func___.__name__) # func___ print(_func_.__name__) # _func_ print(__func_.__name__) # __func_ print(___func_.__name__) # ___func_ print(_func__.__name__) # _func__ print(__func__.__name__) # __func__ print(___func__.__name__) # ___func__ print(_func___.__name__) # _func___ print(__func___.__name__) # __func___ print(___func___.__name__) # ___func___ func() <The classes in a function>:
def func(): class _Cls: pass # SLU (Acceptable) class __Cls: pass # DLU (Unacceptable) class ___Cls: pass # TLU (Unacceptable) class Cls_: pass # STU (Acceptable) class Cls__: pass # DTU (Acceptable) class Cls___: pass # TTU (Acceptable) class _Cls_: pass # SLU & STU (Acceptable) class __Cls_: pass # DLU & STU (Unacceptable) class ___Cls_: pass # TLU & STU (Unacceptable) class _Cls__: pass # SLU & DTU (Acceptable) class __Cls__: pass # DLU & DTU (Acceptable) class ___Cls__: pass # TLU & DTU (Acceptable) class _Cls___: pass # SLU & TTU (Acceptable) class __Cls___: pass # DLU & TTU (Acceptable) class ___Cls___: pass # TLU & TTU (Acceptable) print(_Cls().__class__.__name__) # _Cls print(__Cls().__class__.__name__) # __Cls print(___Cls().__class__.__name__) # ___Cls print(Cls_().__class__.__name__) # Cls_ print(Cls__().__class__.__name__) # Cls__ print(Cls___().__class__.__name__) # Cls___ print(_Cls_().__class__.__name__) # _Cls_ print(__Cls_().__class__.__name__) # __Cls_ print(___Cls_().__class__.__name__) # ___Cls_ print(_Cls__().__class__.__name__) # _Cls__ print(__Cls__().__class__.__name__) # __Cls__ print(___Cls__().__class__.__name__) # ___Cls__ print(_Cls___().__class__.__name__) # _Cls___ print(__Cls___().__class__.__name__) # __Cls___ print(___Cls___().__class__.__name__) # ___Cls___ func() 
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